Epic Flooding in Georgia_ 2009 - USGS

Document Sample
Epic Flooding in Georgia_ 2009 - USGS Powered By Docstoc
					Epic Flooding in Georgia, 2009
Metropolitan Atlanta—September 2009 Floods
•	 The	epic	floods	experienced	in	the	Atlanta	area	in	September	2009		
   were	extremely	rare.	Eighteen	streamgages	in	the	Metropolitan		
   Atlanta	area	had	flood	magnitudes	much	greater	than	the	estimated	
   0.2-percent	(500-year)	annual	exceedance	probability.
•	 The	Federal	Emergency	Management	Agency	(FEMA)	reported	that		
   23	counties	in	Georgia	were	declared	disaster	areas	due	to	this	
   flood	and	that	16,981	homes	and	3,482	businesses	were	affected	
   by	floodwaters.	Ten	lives	were	lost	in	the	flood.	The	total	estimated	
   damages	exceed	$193	million	(H.E.	Longenecker,	Federal	Emergency	
   Management	Agency,	written	commun.,	November	2009).	
                                                                             Measuring Sweetwater Creek floodflow over Interstate 20 near
•	 On	Sweetwater	Creek	near	Austell,	Ga.,	just	north	of	Interstate	20,		     Atlanta, Georgia. Photo by Alan M. Cressler, USGS.
   the	peak	stage	was	more	than	6	feet	higher	than	the	estimated	peak	
   stage	of	the	0.2-percent	(500-year)	flood.	Flood	magnitudes	in	Cobb		
   County	on	Sweetwater,	Butler,	and	Powder	Springs	Creeks	greatly		
                                                                                                                             EXPLANATION
   exceeded	the	estimated	0.2-percent	(500-year)	floods	for	these	streams.	                                          Streamflow at one or more USGS
•	 In	Douglas	County,	the	Dog	River	at	Ga.	Highway	5	near	Fairplay	had		                                              streamgages exceeded the given
                                                                                                                      annual exceedance probability
   a	peak	stage	nearly	20	feet	higher	than	the	estimated	peak	stage	of	the	
                                                                                                                               1 percent (100 year)
   0.2-percent	(500-year)	flood.	                                                                                              0.5 percent (200 year)
•	 On	the	Chattahoochee	River,	the	U.S.	Geological	Survey	(USGS)	gage	at		                                                     0.2 percent (500 year)
   Vinings	reached	the	highest	level	recorded	in	the	past	81	years.	Gwinnett,	                                                    USGS office
   De	Kalb,	Fulton,	and	Rockdale	Counties	also	had	record	flooding.	
                                                                                                     GEORGIA
South Georgia March and April 2009 Floods
•	 The	March	and	April	2009	floods	in	South	Georgia	were	smaller	in		
   magnitude	than	the	September	floods	but	still	caused	significant	damage.
•	 No	lives	were	lost	in	this	flood.	Approximately	$60	million	in	public		
        st
   infra	 	ructure	damage	occurred	to	roads,	culverts,	bridges	and	a	water		
   treatment	facility	(Joseph	T.	McKinney,	Federal	Emergency	Management	
   Agency,	written	commun.,	July	2009).
•	 Flow	at	the	Satilla	River	near	Waycross,	exceeded	the	0.5-percent		
   (200-year)	flood.	Flows	at	seven	other	stations	in	South	Georgia		
   exceeded	the	1-percent	(100-year)	flood.
                                                                     USGS Role During the Floods
                                                                     •	 One	of	the	primary	missions	of	the	USGS	is	the	measurement	and	
                                                                        documentation	of	the	magnitude	and	extent	of	hydrologic	hazards,	
                                                                        such	as	floods,	droughts,	and	hurricane	storm	surge.	
                                                                     •	 In	Georgia,	the	USGS	maintains	a	network	of	more	than	300	stream-
                                                                        gages	that	provide	data	in	real	time	via	the	Internet.	Data	from	these	
                                                                               g
                                                                        stream	 ages	are	used	by	local,	State,	and	Federal	officials	for	numerous	
                                                                        purposes,	including	public	safety,	National	Weather	Service	(NWS)	
                                                                        flood	forecasting,	and	to	aid	emergency	management	officials	in	
                                                                        making	informed	decisions	before,	during,	and	after	flood	events.	
                                                                     •	 During	these	two	flood	events,	USGS	personnel	made	more	than	
                                                                        100	discrete	flood	measurements,	performed	extensive	ongoing	
                                                                        analysis	of	ratings	and	flood	frequency,	collected	water-quality	
Altamaha Regional Park, Glynn County, Georgia, April 14, 2009. The      samples	in	flooded	areas,	and	provided	routing	briefings	to	USGS	
water is 3 feet deep. Photo by Alan M. Cressler, USGS.                  Headquarters,	NWS,	local	government	officials,	and	the	press.

U.S. Department of the Interior                                                                                                     Fact Sheet 2010–3107
U.S. Geological Survey                                                                                                                      October 2010
                                                02392975 Noonday Creek at Shallowford Road,                                                                                                                                                                                02207120 Yellow River at Ga. 124,
                                                  near Woodstock, Georgia                                                                                                                                                                                                    near Lithonia, Georgia
                         100,000                                                                                                                                                                                                         100,000
                                                                                                                                                   September 2009                                                                                                                                                                                                                                September 2009
                                                                                                                                                   flood magnitude                                                                                                                                                                                                                               flood magnitude is
                                                                                                               1 percent AEP




                                                                                                                                                                                                                   Discharge, in ft3/s
                          10,000                                                                                                                   exceeded the                                                                                                                                                                                                                                  about equal to the
Discharge, in ft3/s




                                                                                                                                                                                                                                          10,000
                                                                                                                                                   0.2-percent                                                                                                                                                           Dashed where                                                            0.5-percent (200-
                                                                                                                                                   (500-year)                                                                                                                                                              estimated                                                             year) AEP flood.
                           1,000
                                                                                                                                                   annual
                                                                                                                                                   exceedance                                                                               1,000
                                    100                                                                                                            probability
                                                                                                                                                   (AEP) flood.
                                         10                                                                                                                                                                                                           100
                                                19            20                21                 22               23         24             25                                                                                                                      19                        20              21                 22             23                       24              25
                                                                                                                                                                                                                                                                                           September
                                                                                          September
                                                                                                                                                                                                                                                                       September 2009 flood about equal to the
                                 September 2009 flood is greater than the                                                                                                                                                                                              0.2 percent (500 years) annual exceedance
                                 02336000 Chattahoochee River at Atlanta, Georgia
                                 0.2 percent (500 years) annual exceedance                                                                                                                                                                                             probability flood. Streamgage was inundated EXPLANATION
                         100,000                                                                                                                                                                                                                                        84°
                                 probability flood.                                                                                                      Dade     Catoosa                                                                                              which resulted in loss of continuous data. The River basin
                                                                                                                                                                                                                                                                             Towns
                                                                                                                                                           #
                                                                                                                                                           *                                Fannin
                                                                                                                                                                                 #                                                                                                                            high
                                                                                                                                                                                                                                                                       peak streamflow was determined fromAltamaha
                                                                                                                                                                                                                                                                               #
                                                                                                                                                                                                                                                                               *   # Rabun
                                                                                                                                                                                                                                                                                   *




                                                                                                                                                                                        ld
                                                                                                                                                                                 *
                                                                                                                                                                              #
                                                                                                                                                                              *                                                                                           #
                                                                                                                                                                                                                                                                          *                                                       Ogeechee




                                                                                                                                                                                   itfie


                                                                                                                                                                                                           ray
   Discharge, in ft3/s




                                                                                                                                                                                   #
                                                                                                                                                                                   *                                                                                   Union             #
                                                                                                                                                                                                                                                                                         *
                                                                                                                                                                             # #
                                                                                                                                                                             * *       Gilmer                                                                          water marks. #




                                                                                                                                                                                                      Mur
                                                                                                                                                                               Wh
                                                                                                                                                                                         ##
                                                                                                                                                                                         **                                                                                    #
                                                                                                                                                                                                                                                                               *       *                     Chattahoochee        Satilla–St. Marys
                                                                                                                                                              Walker        #
                                                                                                                                                                            *            #
                                                                                                                                                                                         *




                                                                                                                                                                                                                                                                                                          am
                                                                                                                                                                            #
                                                                                                                                                                            *      #
                                                                                                                                                                                   *                            White      #
                                                                                                                                                                                                                           *
                                                                                                                                                                           ## #
                                                                                                                                                                           ** *                                                                                           Coosa–Tallapoosa          Savannah




                                                                                                                                                                                                                                                                                                      rsh
                                                                                                                                                                               #
                                                                                                                                                                               *           #
                                                                                                                                                                                           *        Lumpkin             #
                                                                                                                                                                                                                        *
                          10,000                                                                                                                           Chattooga




                                                                                                                                                                                                                                                                                                     be
                                                                                                                                                                           #Gordon #
                                                                                                                                                                           *         *                 # #
                                                                                                                                                                                                       * *              #
                                                                                                                                                                                                                        *      Stephens




                                                                                                                                                                                                                                                                                                     Ha
                                                                                                                                                                           #
                                                                                                                                                                           *




                                                                                                                                                                                                                                                 D
                                                                                                                                                              #
                                                                                                                                                              *                                                                                                           Flint                     Suwannee




                                                                                                                                                                                                                                                     aw
                                                                                                                                                                                        Pickens    #
                                                                                                                                                                                                   *




                                                                                                                                                                                                                                                            so
                                                                                                                                                                 # #
                                                                                                                                                                 * *                           #
                                                                                                                                                                                               *        #
                                                                                                                                                                                                        *                       Franklin




                                                                                                                                                                                                                                                                  n
                                                                                                                                                                                                     #
                                                                                                                                                                                                     *                   Banks
                                                                                                                                                                     #
                                                                                                                                                                     *      Bartow           # #
                                                                                                                                                                                             * *                                           Hart                           Ochlockonee               Tennessee
                                                                                                                                                              Floyd#*#
                                                                                                                                                                     #
                                                                                                                                                                     *               # #
                                                                                                                                                                                     * *   #
                                                                                                                                                                                           *       Forsyth
                                                                                                                                                                                           #
                                                                                                                                                                                           *
                                                                                                                                                           #
                                                                                                                                                           *     # * #
                                                                                                                                                                 *        *# *
                                                                                                                                                                                      Cherokee                Hall
                                                                                                                                                                              # #
                                                                                                                                                                              * *#
                                                                                                                                                                                 *                 # #
                                                                                                                                                                                                   * * #
                                                                                                                                                                                                       *                                      #
                                                                                                                                                                                                                                              *                                 # Active streamgage
                                                                                                                                                                                                                                                                                *
                                                                                                                                                                                         #
                                                                                                                                                                                         *             #
                                                                                                                                                                                                       *               Jackson Madison       Elbert
                                                                                                                                                               #
                                                                                                                                                               *                        #
                                                                                                                                                                                        *            ##
                                                                                                                                                                                                     **        #
                                                                                                                                                                                                               *                           #
                                                                                                                                                                                                                                           *
                              1,000                                                                                                                      34°       Polk           ##
                                                                                                                                                                                  **           ## *
                                                                                                                                                                                               **
                                                                                                                                                                                             * * * # ## Barrow #
                                                                                                                                                                                                             *
                                                                                                                                                                                                                     # *
                                                                                                                                                                                                                     *
                                                                                                                                                                                           ## ## #
                                                                                                                                                                                           *# *
                                                                                                                                                                                            #*             *                Clarke Oglethorpe #     *
                                   19                         20            21                   22                23         24         25                                                 *           # #*
                                                                                                                                                                                                        **                    ##
                                                                                                                                                                                                                              **
                                                                                                                                                                         Paulding Cobb #          #Gwinnett#
                                                                                                                                                                                                  *
                                                                                                                                                                                  ## * #
                                                                                                                                                                                  ** # *
                                                                                                                                                                                 # # ## # #
                                                                                                                                                                                 * * ** * *
                                                                                                                                                                                           *
                                                                                          September                                                            Haralson
                                                                                                                                                                                            #
                                                                                                                                                                                            *
                                                                                                                                                                                            #
                                                                                                                                                                                            *
                                                                                                                                                                                           # #
                                                                                                                                                                                           * *           ## Walton Oconee
                                                                                                                                                                                                         **                 #
                                                                                                                                                                                                                            *                     Wilkes Lincoln
                                                                                                                                                              #
                                                                                                                                                              *                      #
                                                                                                                                                                                     *                 #
                                                                                                                                                                                                       *#
                                                                                                                                                                                                        *
                                                                                                                                                                                     *#
                                                                                                                                                                             Douglas #* on      DeKalb # #
                                                                                                                                                                                                       * *  #                     #
                                                                                                                                                                                                                                  *




                                                                                                                                                                                                                                                                           le
                                                                                                                                                                                               #
                                                                                                                                                                                               *            *
                                                 September 2009 flood between the between
                                                 September 2009 flood ismagnitude is 1 and                                                                                     # # ult ##   **                                                  #
                                                                                                                                                                                                                                                *




                                                                                                                                                                                                                                                                       da
                                                                                                                                                                               * *                         # #
                                                                                                                                                                                                           * *
                                                                                                                                                                                                            #
                                                                                                                                                                                                            *




                                                                                                                                                                                                                                                                      ck
                                                                                                                                                                       #
                                                                                                                                                                       *              F              #
                                                                                                                                                                                                     *                           Greene              #
                                                                                                                                                                                                                                                     *                     # #
                                                                                                                                                                                                                                                                           * *



                                                                                                                                                                                                                                                                      Ro
                                                                                                                                                                                                                                          ton
                                                                                                                                                                                                       #
                                                                                                                                                                                                       *                                                               Columbia 82°
                                                 the 1- and (100 and 200 years) annual
                                                 0.5 percent 0.5-percent (100- and 200-year)                                                                    #
                                                                                                                                                                *
                                                                                                                                                                 Carroll
                                                                                                                                                                           #
                                                                                                                                                                           *
                                                                                                                                                                           #
                                                                                                                                                                           *                               Newton        Morgan             Taliaferro
                                                                                                                                                                                                                                         Clay




                                                                                                                                                                                                                                                                                                                                                        Mc
                                                                                                                                                                            #
                                                                                                                                                                            *                    #
                                                                                                                                                                                                 *         #
                                                                                                                                                                                                           *
                                                 exceedance probability flood.
                                                 AEP flood.                                                                                                                                  # Henry                                                                          #
                                                                                                                                                                                                                                                                              *#
                                                                                                                                                                                                                                                                               *
                                                                                                                                                                                                                 Fa




                                                                                                                                                                                                                                                                                                                                                           Du
                                                                                                                                                                                    #
                                                                                                                                                                                    *#
                                                                                                                                                                                     *       *                                                      Warren                  Augusta#
                                                                                                                                                                                                                                                                              #
                                                                                                                                                                                                                                                                              *     *
                                                                                                                                                                  #Heard Coweta
                                                                                                                                                                                                                     yet




                                                                                                                                                                                                                                                                                                                                                               ffie
                                                                                                                                                                  *                          #
                                                                                                                                                                                             *                                Putnam                                       Richmond
                                                                                                                                                                                         #
                                                                                                                                                                                         *                      #Jasper      #
                                                                                                                                                                                                                           te




                                                                                                                                                                      #
                                                                                                                                                                      *                                         *            *
                                                                                                                                                                         #
                                                                                                                                                                         *                   Spalding Butts
                                                                                                                                                                                            ##
                                                                                                                                                                                            **   #
                                                                                                                                                                                                 *                          #
                                                                                                                                                                                                                            *                                  oc
                                                                                                                                                                                                                                                                  k
                                                                                                                                                                                                                                      Hancock               sc
                                                                                                                                                                                                  #
                                                                                                                                                                                                  *                                                      la             #
                                                                                                                                                                                                                                                                        *
                                                                                                                                                                                                                                                       G                                  #
                                                                                                                                                                                                                                                                                          *
                                                                                                                                                                          #
                                                                                                                                                                          *                                                                                      Jefferson Burke # *
                                                                                                                                                                                                               er




                                                                                                                                                                                            Pike Lamar        # #
                                                                                                                                                                                                              * *                    #
                                                                                                                                                                                                                                     *
                                                                                                                                                                                                           eth




                                                                                                                                                                                        #
                                                                                                                                                                                        *                Monroe #               Baldwin     Washington
                                                                                                                                                                      Troup                                          * Jones
                                                                                                                                                                                                      riw




                                                                                                                                                                                                                                                           #
                                                                                                                                                                                                                                                           *                             # # #
                                                                                                                                                                                                                                                                                         * * *
                                                                                                                                                                                                Me




                                                                                                                                                                   #
                                                                                                                                                                   *                                                                     #
                                                                                                                                                                                                                                         *
                                                                                                                                                                   #
                                                                                                                                                                   *                           Upson                                        #
                                                                                                                                                                                                                                            *
                                                                                                                                                                                                                   Bibb #            #
                                                                                                                                                                                                                                     *
                                                                                                                                                                                                                    # *
                                                                                                                                                                                                                    *                        #
                                                                                                                                                                                                                                             *
                                                                                                                                                                                                                                                                           #
                                                                                                                                                                                                                                                                           *                Screven
                                                                                                                                                                         Harris                                                       # son
                                                                                                                                                                                                                                      *                                          Jenkins
                                                                                                                                                                                     Talbot      #
                                                                                                                                                                                                 *                                      in          Johnson
                                                                                                                                                                                                                  d        Twiggs Wilk
                                                                                                                                                                                                            w for                                                                       #
                                                                                                                                                                                                                                                                                        *
                                                                                                                                                                                                                                                                             a              h                                                                         Emanuel
                                                                                                                                                                                                                                                                        Cr             ac
                                                                                                                                                                                    ##
                                                                                                                                                                                    **                                                     Taylor                                 Pe                                                    #
                                                                                                                                                                                                                                                                                                                                        *                                                                                  #
                                                                                                                                                                                                                                                                                                                                                                                                                           *
                                                                                                                                                                                                                                                                                                                                                                                                          #
                                                                                                                                                                                                                                                                                                                                                                                                          *
                                                                                                                                                                              # Columbus
                                                                                                                                                                              *
                                                                                                                                                                              #
                                                                                                                                                                               Muscogee
                                                                                                                                                                              * ##                                                                                                          Houston




                                                                                                                                                                                                                                                                                                                                                                                                               Eff
                                                                                                                                                                                  **                                                                                  Macon                               Bleckley                                Treutlen
                                                                                                                                                                                                                                                                                                                                                           #
                                                                                                                                                                                                                                                                                                                                                           *
                                                                                                                                                                                  #
                                                                                                                                                                                  *                                                                                                                                                                                                             Bulloch
                                                         02337000 Sweetwater Creek near Austell, Georgia                                                                       #
                                                                                                                                                                               *                                                                                                                                                                                                                                        # #
                                                                                                                                                                                                                                                                                                                                                                                                                        * *




                                                                                                                                                                                                                                                                                                                                                                                                                  ing
                                                                                                                                                                               Ch                                                                                                                                                 Laurens                                       Candler                                    #
                                                                                                                                                                                                                                                                                                                                                                                                                           *
                                                                                                                                                                                        atta




                                                                                                                                                                                                                                                                                                                                                                                                                   ha
                                                                                                                                                                                               hoo
                                                                                                                                                                                                               Marion                                                  #
                                                                                                                                                                                                                                                                       *
                                                35,000                                                                                                                                               che                                                                                                  #
                                                                                                                                                                                                                                                                                                          *                                                                                                               #



                                                                                                                                                                                                                                                                                                                                                       Montgomery
                                                                                                                                                                                                           e                                                                                                                                                                                                              *
                                                                                                                                                                                                                                                                                                                                                                                                                          #
                                                                                                                                                                                                                                                                                                                                                                                                                          *




                                                                                                                                                                                                                                                                                                                                                                                                                      m
                                                                                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                                         *                                                                                                                  #
                                                                                                                                                                                    #
                                                                                                                                                                                    *
                                                                                                                                                                                                                                     Schley                                      #
                                                                                                                                                                                                                                                                                 *Dooly              Pulaski          Dodge
                                                                                                                                                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                                                                                                                                  *                                         #
                                                                                                                                                                                                                                                                                                                                                                                            *                 ##
                                                                                                                                                                                                                                                                                                                                                                                                              **          #
                                                                                                                                                                                                                                                                                                                                                                                                                          * *
                                                                                                                                                                        #
                                                                                                                                                                        *                                                                                                                                                                   Wheeler
                                                30,000                                                                                                                                                                                          #                                                                                                                   Toombs #               Evans                             ##
                                                                                                                                                                                                                                                                                                                                                                                                                             **
                          Discharge, in ft3/s




                                                                                                                                                                               Stewart                                                          *                                                                                                                          *                                                         #
                                                                                                                                                                                                                                                                                                                                                                                                                                     *
                                                                                                                                                                                                                       r




                                                                                                                                                                  32°                                            #
                                                                                                                                                                                                                 *                                                                                                                                                                                        Bryan            Chatham
                                                                                                                                                                                                                 ste




                                                                                                                                                                                                                                            Sumter #
                                                                                                                                                                                                                                                   *
                                                                                                        ated




                                                                                                                                                                                                                                                                                                      Wilcox                            #
                                                                                                                                                                                                                                                                                                                                        *
                                                25,000
                                                                                                                                                                                                                eb




                                                                                                                                                                                                                                                                                   Crisp                                                                   #
                                                                                                                                                                                                                                                                                                                                                           *                    Tattnall
                                                                                                                                                                                                               W




                                                                                                                                                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                                                                                                                                 *                    #
                                                                                                                                                                                                                                                                                                                                                                      *
                                                                                                                                                                                   an
                                                                                                                                                                             itm                                 Terrell                                      Lee                                                                 Telfair                                                             Liberty
                                                                                                      Estim




                                                20,000                                                                                                                  Qu    #
                                                                                                                                                                              *
                                                                                                                                                                                                                                                                                                                                                 Jeff
                                                                                                                                                                                                                                                                                                                                                                                                              #
                                                                                                                                                                                                                                                                                                                                                                                                              *
                                                                                                                                                                                                                                                # #
                                                                                                                                                                                                                                                * *                                             Turner               Ben Hill
                                                                                                                                                                                         Randolph                                                                      #
                                                                                                                                                                                                                                                                       *                                                                        Davis                Appling                     Long
                                                15,000                                                                                                               #
                                                                                                                                                                     *
                                                                                                                                                                     #
                                                                                                                                                                     *                                                                                                                                      #
                                                                                                                                                                                                                                                                                                            *
                                                                                                                                                                                                                                                                                                                                                                                                #
                                                                                                                                                                                                                                                                                                                                                                                                *
                                                                                                                                                                                                                #
                                                                                                                                                                                                                *                                                                                               Irwin                   Coffee                                                                        sh
                                                                                                                                                                         Clay                          # #
                                                                                                                                                                                                       * *                                                                                                                                                                                 Wayne               into
                                                10,000                                                                                                                                                   # Dougherty
                                                                                                                                                                                                         *
                                                                                                                                                                                                                                                                                 Worth
                                                                                                                                                                                                                                                                                                     Tift
                                                                                                                                                                                                                                                                                                                                                           Bacon                                          Mc
                                                                                                                                                                                                 Calhoun #
                                                                                                                                                                                                         *                                                                                                                                                                          #
                                                                                                                                                                                                                                                                                                                                                                                    *                                 #
                                                                                                                                                                                                                                                                                                                                                                                                                      *
                                                                                                                                                                                                                                                                                                                                                                                                          #
                                                                                                                                                                                                                                                                                                                                                                                                          *
                                                 5,000                                                                                                                  Early
                                                                                                                                                                                                       ##
                                                                                                                                                                                                       **                                                                                                                #
                                                                                                                                                                                                                                                                                                                         *                                                 #
                                                                                                                                                                                                                                                                                                                                                                           *
                                                                                                                                                                                                                               er




                                                                                                                                                                                                        # #
                                                                                                                                                                                                        * *                                                                                                                         Atkinson            #
                                                                                                                                                                                                                                                                                                                                                        *                 Pierce
                                                                                                                                                                                                                                                                                                                 Berrien
                                                                                                                                                                                                                          Bak




                                                                                                                                                                    #
                                                                                                                                                                    *                                                                                                                                                                                                                                   Glynn
                                                     0                                                                                                                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                                                                                                                                                       *                     #
                                                                                                                                                                                                                                                                                                                                                                                             *
                                                                                                                                                                                                                                                                                                                                                                                        y



                                                                                                                                                                                                        # Mitchell
                                                                                                                                                                                                        *                                                                         Colquitt                Cook
                                                                                                                                                                                                                                                                                                                                                                                     tle




                                                                                                                                                                        #
                                                                                                                                                                        *
                                                         19        20                       21                22         23         24              25                                          Miller                                                                                               #
                                                                                                                                                                                                                                                                                                     *                                                                                                         ##
                                                                                                                                                                                                                                                                                                                                                                                                               **
                                                                                                                                                                                                                                                                                                                                                                                   an




                                                                                                                                                                                                        #
                                                                                                                                                                                                        *
                                                                                                                                                                                                                                                                                                                                                                                  Br




                                                                                                                                                                                                                                                                                                                               Lanier                               Ware
                                                                                                   September                                                                                    #
                                                                                                                                                                                                *
                                                                                                                                                                                         le




                                                                                                                                                                                                                                                                            #
                                                                                                                                                                                                                                                                            *
                                                                                                                                                                                        ino




                                                                                                                                                                                                                                           Grady                                                                     #
                                                                                                                                                                                                                                                                                                                     *                        Clinch
                                                                                                                                                                                                 #
                                                                                                                                                                                                 *             #
                                                                                                                                                                                                               *                                                                                                                                                                                    Camden
                                                                                                                                                                                   Sem




                                                          September 2009 flood magnitude greatly
                                                          September 2009 flood exceeded the 0.2 percent                                                                                                        Decatur
                                                                                                                                                                                                                                                                       # Thomas
                                                                                                                                                                                                                                                                       *
                                                                                                                                                                                                                                                                                                     # #
                                                                                                                                                                                                                                                                                                     * *
                                                                                                                                                                                                                                                                                                                                                                            Charlton

                                                          (500 years) annual exceedance probability flood.
                                                          exceeded the 0.2-percent (500-year) AEPflood.                                                                                 #
                                                                                                                                                                                        *                            #
                                                                                                                                                                                                                     *                                                                          Brooks
                                                                                                                                                                                                                                                                                                              Low
                                                                                                                                                                                                                                                                                                                     nde          # Echols
                                                                                                                                                                                                                                                                                                                                  *                      #
                                                                                                                                                                                                                                                                                                                                                         *
                                                                                                                                                                                                                                                                                                                           s                             #
                                                                                                                                                                                                                                                                                                                                                         *
                                                          Streamgage was inundated which resulted in
                                                          loss of continuous data. USGS personnel were                                                                                                                                                                                               0                20                    40 MILES
                                                                             02327500 peak streamflow.
                                                          at the site and measured theOchlockonee River                                                                                                                                                                                                                                                                             #
                                                                                                                                                                                                                                                                                                                                                                                    *
                                                                                                                                                                                                                                                                                                     0          20             40 KILOMETERS
                                                                              near Thomasville, Georgia
                                                                                         100,000
                  April 2009 flood
                  magnitude is
                  between the
                                                                   Discharge, in ft3/s




                  1- and 0.5-percent                                                      10,000                                                                                                                                                                                        02226500 Satilla River near Waycross, Georgia
                  (100- and 200-year)                                                                                                                                                                                                                                 100,000
                                                                                                                                                                                                                                                                                                                                                                                                              April 2009 flood
                  AEP flood.                                                                                                                                                                                                                                                                                                                                                                                  magnitude is
                                                                                           1,000
                                                                                                                                                                                                                                                Discharge, in ft3/s




                                                                                                                                                                                                                                                                                                                                                                                                              about equal to
                                                                                                                                                                                                                                                                       10,000
                                                                                                                                                                                                                                                                                                                                                                                                              the 0.5-percent
                                                                                                                                                                                                                                                                                                                                                                                                              (200-year)
                                                                                            100
                                                                                               25              30        4          9          14          19       24                         29                                                                                                                                                                                                             AEP flood.
                                                                                                                                                                                                                                                                        1,000
                                                                                                   March                                           April

                      By Anthony J. Gotvald and Brian E. McCallum                                                         For more information contact:                                                                                                                     100
                                                                                                                          USGS Georgia Water Science Center                                                                                                                            25             30                 4              9         14                 19            24            29
                      Design and layout by Caryl J. Wipperfurth
                                                                                                                          3039 Amwiler Road, Suite 130                                                                                                                                 March                                                           April
                      http://ga.water.usgs.gov                                                                            Atlanta, Georgia 30360
                      http://www.usgs.gov                                                                                 telephone: 770–903–9100

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:1
posted:3/9/2013
language:English
pages:2