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Flood Tracking Chart for the Upper San Jacinto River by kxo18838

VIEWS: 30 PAGES: 1

									U.S. Department of the Interior                                                                                                                                                                                                                                                                                                        USGS Open-File Report 00–387
U.S. Geological Survey


Flood Tracking Chart for the Upper San Jacinto River Basin near Houston, Texas
                                                                                                                                                                                              40
                                                                                                                                                                                                                       (08068000) West Fork San Jacinto River
                                 Elevation of threatened property                                                                                                                                                      near Conroe, Texas
                                                                                                                                                                                              35                       (add 95.03 feet to convert to mean sea level)




                                                                                                                                                                       GAGE HEIGHT, IN FEET
                                 Key streamflow-gaging station(s)                                                                                                                                                      Flood data begin in 1913
                                                                                                                                                                                                                                                                 32.3
                                 Difference in stream-channel eleva-                                                                                                                                                                                    31.12
                                                                                                                                                                                              30                                       30.5
                                 tion between property and station
                                                                                                                                                                                                                                                                                27.79
                                 To convert gage height to mean sea level
                                                                                                                                                                                              25
                                 EXAMPLE: Spring Creek near Spring, Texas
                                 If gage height = 33.6 feet,                                                                                                                                                                Flood
                                                                                                                                                                                              20
                                 elevation above mean sea level = 33.6 + 73.10 feet                                                                                                                                         stage
                                                                = 106.70 feet
                                                                                                                                                                                                                                       1913             1940     1994           1998
                                                                                                                                                                                              15
                                                                                                                                                                                                                                        Historical peak gage heights                                           35
                            50                                                                                                        Graphed stations                                                                                                                                                              (08070500) Caney Creek near Splendora, Texas
                                                                                                                                                                                                                                                                                                                    (add 118.44 feet to convert to mean sea level)
                                          (08068500) Spring Creek near Spring, Texas                                                                                                                                                                                                                                Flood data begin in 1885
                                                                                                                                      Other internet stations




                                                                                                                                                                                                                                                                                        GAGE HEIGHT, IN FEET
                            45            (add 73.10 feet to convert to mean sea level)                                                                                                                                                                                                                        30
     GAGE HEIGHT, IN FEET




                                          Flood data begin in 1879
                            40
                                                                                                                                                 o                                                                                                                                                                                         27       26.3      26.4
                                                                                                                                               95 45'                                                                                                                                                          25
                                                                                                                                      30o45'
                            35
                                                                                                                                                     WALKER                                         o                                       o                                                                                   24.3
                                                       34.3         33.6                                                                                                                       95 30'                                   95 15'
                                                                                32.79    32.29
                            30                                                                                                                                                                                                                                                                                 20




                                                                                                                                                                                                                             EA
                                                                                                                                                                                                                                                                                                                        Flood




                                                                                                                                                                                                                                 ST
                            25
                                                                                                                                                                                                                                      FO                                                                                stage
                                                                                                                                                                                                                                            RK
                                                                                                                                                                                                                                                                                                                                1935      1940     1973      1994
                                                       1929         1940        1945     1998                                                                                                                                                                                                                  15




                                                                                                                                                                                                                                                SAN
                            20                                                                                                                                                                                                                                                                                                   Historical peak gage heights
                                                                                                                                                                                                                             SAN
                                                            Historical peak gage heights                                                                                                                                      JACINTO                                                                          35




                                                                                                                                                                                                                                                  JACIN
                            50                                                                              GRIMES                                                                                                                                                                                                  (08070000) East Fork San Jacinto River
                                          (08068520) Spring Creek at Spring, Texas                  o                                      MONTGOMERY                                                                                                                                                               near Cleveland, Texas




                                                                                                                                                                                                                                                                                        GAGE HEIGHT, IN FEET
                                                                                                  30 30'




                                                                                                                                                                                                                                                       TO
                                          (inactive)                                                                                             LAKE                                                                                                                           o                                   (add 107.98 feet to convert to mean sea level)
                            45                                                                                                                                                                                                                                               95
                                          (add 62.17 feet to convert to                                                                                                                                                                                                                                        30   Flood data begin in 1935
     GAGE HEIGHT, IN FEET




                                                                                                                                                  CONROE                                                                      Pea




                                                                                                                                                                                                                                                          RI
                                          mean sea level)                      44.05




                                                                                                                                                                                                                                                             V
                                                                                                                                                                                                                     Ca


                                                                                                                                                                                                                                 ch




                                                                                                                                                                                                                                                           ER
                            40
                                                                                                                                                                                                                      ney




                                                                                                                                                                                                                                                                   LIBERTY                                     25                         25.39
                            35                                                                                                                                                                                                                                                                                                  24.9                         24.57
                                                                                                                                                         08067600                                                                105                                                                                                               23.92
                                                                                                                                                                                                                    State
                                                                                                                                                                       W
                                                                                                                                                                             ES




                                                                                                                                                                                                                                                                        Lu
                                                                                                                                                           08067650                                                                               Cr
                                                                                                                                                                                                                                                    eek
                                                                                                                                                                               T




                                                                                                                                                                                                                                                                        ce
                            30                                        31.66                                                                                                                                                                                                                                    20      Flood
                                                                                                                                                                                                               CONROE
                                                                                                                                                                                                                                    Cr




                                                                                                                                                                                                                                                                         Bayo
                                                                                                                                                                                                                                                                                                                       stage
                                                                                                                                                                                                   FO




                                                                                                   30o15'
                                                                                                                                                                                                                                      eek




                            25
                                                                                                                                                                                                     RK




                                                                                                                                                                                                                                                                             u
                                                                                                            WALLER                                                                                                                                                                                                              1935      1940     1973      1994
                                                                                                                                                                                                       SA




                                              Flood stage                               1994
                                                                                                                                                                                                                                                   59




                                                                      1985                                                                                                                                                                                                                                     15
                                                                                                                                                                                                               N




                                                                                                                                                                                                                                                                                                                                  Historical peak gage heights
                                                                                                                                                                                                                                                US




                            20
                                                                                                                                                                                                           I–45




                                                            Historical peak gage heights
                                                                                                                                                                    k




                                                                                                                                                                                                                                                                                                               35
                                                                                                                                                                  ee




                                                                                                                                                                                                                    JA
                                                                                                                                                                Cr




                                                                                                                                                                                                                      CI




                            90                                                                                                                                                                                                                                                                                      (08071000) Peach Creek at Splendora, Texas
                                                                                                                                                                                                                                                        08070200
                                                                                                                                                                                                                        NT




                                          (08068780) Little Cypress Creek near                                                                   Spring                                                                                                                                                             (add 81.61 feet to convert to mean sea level)
                                                                                                                                                                                                                          O




                                                                                                                                                                                                                            08068090
                                                                                                                                                                       k




                                                                                                                                                                                                                                                                                        GAGE HEIGHT, IN FEET
                                          Cypress, Texas                                                                                                                                                                     RI                                                                                30
                                                                                                                                                                     ee




                                                                                                                                                                                                                                                                                                                    Flood data begin in 1895
                                                                                                                                                                                                                               VE
                                                                                                                                                                   Cr




                                                                                                              HARRIS            illow
     GAGE HEIGHT, IN FEET




                                          (add 80.00 feet to convert to mean sea level)                                                                                                                                           R
                            85                                                                                  Little Cypress W                  k
                                          Flood data begin in 1982                                                                            ree
                                                                                                                                Cr 08068900 C                                                                       FM 1                                                                                       25
                                                                                                                  US               ee                                                                                      960
                                                                                                  30o                290              k                                                                                              LAKE
                                                                       81.41                                                                                                                                                                                                                                                              22.73    22.57
                            80                                80.49              80.58                         08068720 Cypress                                                                                                       HOUSTON                                                                                   22.3
                                                                                          79.83                                                                                                                                                                                                                20                                            20.92
                                                    79.3                                                                                                                            08068800
                                                                                                        08068700

                            75                                                                                                                                                                                                                                                                                 15
                                                                                                                                                           0       5                               10          15           20 MILES                                                                                    Flood
                                                                                                                                                                                                                                                                                                                        stage
                                                                                                                                                                                                                                                                                                                                1940      1949     1973      1986
                                                    1985      1987     1994      1998     1998                                                                                                                                                                                                                 10
                            70                                                                                                        50                                                                                                                                                                                         Historical peak gage heights
                                                       Historical peak gage heights                                                                                                                                                                                                                            45
                                                                                                                                                        (08069000) Cypress Creek near Westfield, Texas
                            60                                                                                                                                                                                                                                                                                      (08071280) Luce Bayou above Lake Houston
                                          (08068740) Cypress Creek at House-Hahl                                                      45                (add 63.89 feet to convert to mean sea level)
                                                                                                                                                        Flood data begin in 1875                                                                                                                                    near Huffman, Texas
                                          Road near Cypress, Texas                                                                                                                                                                                                                                             40   (add 39.91 feet to convert to mean sea level)
                                                                                                                                                                                                                                                                                        GAGE HEIGHT, IN FEET




                            55
     GAGE HEIGHT, IN FEET




                                                                                                               GAGE HEIGHT, IN FEET




                                          (add 100.00 feet to convert to mean sea level)                                                                                                                                                                                                                            Flood data begin in 1984
                                          Flood data begin in 1908                                                                    40
                            50                                                                                                                                                                                                                                                                                 35
                                                                                                                                                                                                                                                                                                                                                    35.08
                                                      49                                  48.45                                                                                                                                                                                                                                            33.45
                                                                                 47.61                                                35
                            45                                46.33        46                                                                                                                                                                                                                                                                                 31.4
                                                                                                                                                                            34                                                                                                                                 30                30.6
                                                                                                                                                                                                                     33.45
                            40                                                                                                        30                                                                31.0                      31.25
                                                                                                                                                                                                                                                                                                               25
                            35                                                                                                                                                                                                                                                                                         Flood
                                                                                                                                      25                                                                                                                                                                               stage     1987      1989     1994     1998
                                                    1937      1979     1982      1994     1998                                                             Flood                                                                                                                                               20
                            30                                                                                                                                                                                                                                                                                                    Historical peak gage heights
                                                                                                                                                           stage       1929                             1945         1949         1989
                                                       Historical peak gage heights                                                   20
                                                                                                                                                                       Historical peak gage heights



      The “Flood Tracking Chart for the Upper San                                                                Current stream information is especially important                                                                                                          Third: Add the conversion number from key station
  Jacinto River Basin near Houston, Texas” can be used                                                       during floods. The USGS provides current gage                                                                                                                graph to gage height to estimate the water-surface
  to track river stage and to assess flood-crest informa-                                                    heights and discharge data to the public through the                                                                                                         elevation of the flood. Comparison of the approximate
  tion during substantial storms. Water-surface elevation                                                    NWS, news releases, and the Internet. The NWS has                                                                                                            elevation of the property or low-water crossing to the
  during a flood will provide emergency-response                                                             direct access to streamflow data collected by the                                                                                                            estimated water-surface elevation can indicate the
  personnel, residents, and the traveling general public                                                     USGS for use in its stream forecasting models and rou-                                                                                                       actual threat of flooding. Adding the conversion num-
  essential information to make informed decisions con-                                                      tinely broadcasts the forecast information to the news                                                                                                       ber to the historical peak gage heights will determine
  cerning conditions that threaten life and property in                                                      media and on shortwave radio. The radio frequency in                                                                                                         highest water-surface elevations of historical flooding.
  Montgomery County and parts of Harris, Liberty, and                                                        the upper San Jacinto River Basin is 162.40 MHz at                                                                                                           Comparison of highest water-surface elevations of his-
  San Jacinto Counties.                                                                                      KGG-68 in Houston. The USGS Texas Web address is                                                                                                             torical flooding to estimated water-surface elevation
      This flood tracking chart displays a map of the                                                        http://tx.usgs.gov/. Access to real-time streamflow data                                                                                                     also can indicate the threat of flooding.
  upper San Jacinto River above Lake Houston, bar                                                            is provided through the Real-Time Water Data link at
                                                                                                                                                                                                                                                                             Note: The surface of flowing water has a slope in
  graphs of the highest known historical peak gage                                                           this site.
                                                                                                                                                                                                                                                                          the downstream direction. The estimated water-surface
  heights of 10 streamflow-gaging stations (9 active and                                                        The flood tracking chart can be used to estimate the                                                                                                      elevation at a point distant from a station will be differ-
  1 inactive), and locations of 8 additional gaging sta-                                                     threat to a particular property or low-water crossing as                                                                                                     ent from that at the station. The difference in elevation
  tions that are on the USGS Texas Internet Web site. Bar                                                    follows:                                                                                                                                                     of the stream channel between the site of interest and
  graphs present historical peak gage heights and their
                                                                                                                First: Determine the approximate elevation of the                                                                                                         the station can be used as an estimated adjustment to
  years of occurrence from U.S. Geological Survey
                                                                                                             threatened property or low-water crossing and record                                                                                                         the water-surface elevation between the two points.
  (USGS) data records and list information about station
  number and name, conversion of gage height to mean                                                         that elevation.                                                                                                                                                 The network of streamflow-gaging stations in the
  sea level, beginning year of historical flood data, and                                                       Second: Determine the key streamflow-gaging                                                                                                               upper San Jacinto River Basin is funded and operated
  National Weather Service (NWS) flood stage (where                                                          station on the same stream and closest to the threatened                                                                                                     by the USGS Texas District in cooperation with the
  determined). Station gage heights plus the conversion                                                      property or low-water crossing. Example: The gaging                                                                                                          Texas Water Development Board, San Jacinto River
  numbers equal water-surface elevation above mean sea                                                       station closest to Conroe is 08068000. Using the news                                                                                                        Authority, Harris County, City of Houston, and
  level at the station. NWS flood stage is defined as the                                                    media, shortwave radio, or Internet, obtain and record                                                                                                       U.S. Army Corps of Engineers-Galveston. For more
  gage height when water in a stream exceeds its natural                                                     the latest gage height information in your area with                                                                                                         information about USGS programs in Texas, contact
  banks at the nearest point to the gage (David Schwartz,                                                    particular attention to the closest gaging station to the                                                                                                    the USGS Representative at the address and telephone
  National Weather Service, oral commun., 2000).                                                             threatened property or low-water crossing.                                                                                                                   number listed below.


                                                                                                             For more information please contact
  —D.L. Barbie                                                                                               District Chief, U.S. Geological Survey                                                                                                                       Phone: (512) 927–3500
                                                                                                             8027 Exchange Dr., Austin, TX 78754–4733                                                                                                                     FAX: (512) 927–3590
                                                                                                             E-mail: gs-w-txpublic-info@usgs.gov                                                                                                                          World Wide Web: http://tx.usgs.gov/

								
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