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FLOODPLAIN MANAGEMENT AND DUTIES OF THE LOCAL ADMINISTRATOR

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FLOODPLAIN MANAGEMENT AND DUTIES OF THE LOCAL ADMINISTRATOR Powered By Docstoc
					  National Flood
Insurance Program




Administered by FEMA
 Introduction
     Workshop Topics...

 Duties   of the Local Administrator

 Mapping    & Map Changes
 FEMA     Elevation Certificate
         ...Workshop Topics

   Substantial Improvement & Substantial
    Damage
   Development in Approximate Zone A
    Areas
   Flood Insurance & Community Rating
    System
         Workshop Comments...

   This workshop is a broad overview of the
    NFIP and it is intended as a starting point.

   To facilitate the learning process, be
    prepared to accept the general nature of the
    NFIP regulations - We are not going to
    rewrite the NFIP standards today!!!
        ...Workshop Comments
   Topics pertain to the minimum standards of
    the NFIP only - other related Federal/State
    programs will not be covered

   Subject matter applies to the Special Flood
    Hazard Area, i.e., the “100-year” floodplain
    only

   Questions and comments are highly
    encouraged!
    The National Flood Insurance
             Program...
   The National Flood
    Insurance Program
    was established by
    Congress in 1968

   The NFIP is
    administered by the
    Federal Emergency
    Management Agency
    ...The National Flood Insurance
                Program
   Over 19,000 communities
    in the U.S. participate in
    the NFIP
   At least 98% of California
    communities participate in
    the NFIP
   Approximately 10% participate in the
    Community Rating System
                   The NFIP

   “...a specialty tool to achieve mitigation
    through the planning process.”

   Mitigation means “to make or become less
    severe or intense.”
                 NFIP Goals

   To protect lives and
    property

   To reduce the
    financial burden for
    flood disaster
    assistance
         Insurance Implications
   By law, structures that are located in a
    Special Flood Hazard Area and are financed
    by a federally regulated loan must have
    flood insurance coverage for the amount of
    the loan.
   There is no federal flood insurance purchase
    requirement for structures that are located
    outside of the Special Flood Hazard Area
    (Zone B, C, and X) .
Floodplain Management Priorities

      Public Safety!

The NFIP should be viewed as a public safety
 program at the local level.
      Three Aspects of NFIP

Risk identification     Availability of
and mapping           flood insurance


               Community
               compliance
Three Responsibilities


  Federal           State


            Local
         Federal Responsibilities

 Oversee national program
 Identify risks through mapping
 Establish development standards
 Provide affordable insurance coverage
 Regional offices:
    – Community Assistance Program w/ states
        (CACs and CAVs)
            State’s Role

In each State, the
governor designates a
coordinating agency
for the NFIP. In
California, it is the
Department of Water
Resources.
       State Responsibilities

 Oversee state program
 Establish development standards
  (if applicable)
 Provide technical assistance to
  local communities
 Document and evaluate floodplain
  management activities
        State of California Model
          Floodplain Ordinance
   Meets the minimum standards of the NFIP
   Includes recommended higher standards (Appendix
    A)
   The current Model (December 2006), has been
    updated to include more detailed regulations and
    specific language
   http://www.water.ca.gov/floodmgmt/lrafmo/fmb/fa
    s/nfip/guidelines.cfm
     Comments About the Model
          Ordinance...
   The Model Floodplain Management
    Ordinance is intended as a starting point
    for communities

   The Model should be tailored to fit each
    community’s needs
    ...Comments About the Model
            Ordinance
   Communities should consider adopting
    more restrictive standards than the
    minimum standards found in the Model
    Ordinance (Appendix A)
             Local Responsibilities

 Adopt/enforce local ordinances or court
  orders – at least minimum standards
 Issue/deny floodplain development permits
 Oversee development
    –   Inspect development
    –   Maintain development records
    –   Remedy violations
    –   Flood insurance available to all property owners in communities
        that participate in the NFIP
Floodplain Management
     Partnerships

          Public/Private
          partnerships are
          essential to protect
          lives and property and
          to break the rebuild-
          destruction cycle.
                 Public Sector
   Local Planning, Zoning,      Other State Agencies
    and Building Officials        (OES, DFG)
   Local Community              Other Federal Agencies
    Elected Officials             (ex. COE, NRCS, FWS,
   State NFIP                    FDIC, SBA)
    Coordinating Agency -
    DWR
   State Insurance
    Commissioners
   FEMA
            Private Sector

 Property-buying         Surveyors
  Public                  Environmental
 Lenders                  Groups
 Insurance Agents
 Real Estate Agents
 Appraisers
 Consulting Engineers
Benefits of Partnerships

               Communities are
                less disrupted!

               Damages are
                reduced!!

               Lives are saved!!!
               Acronyms
   BFE -   Base Flood Elevation
   CRS -   Community Rating System
   DWR - Department of Water Resources
   FEMA - Federal Emergency Management
           Agency
   NFIP - National Flood Insurance Program
   SFHA - Special Flood Hazard Area
Definitions You Need To Know
                Development

                SFHA
                Base Flood Elevation
                Floodway
                Lowest Floor
  Definition of Development

“...means any man-made change to
improved or unimproved real estate,
including but not limited to buildings or
other structures, mining, dredging, filling,
grading, paving, excavation or drilling
operations or storage of equipment or
materials.”
     Definition of SFHA...
“The land in the flood plain within a
community subject to a one percent or
greater chance of flooding in any given
year.
       ... Definition of SFHA

The area may be designated as Zone A on the
FHBM.

After detailed rate making has been completed
in preparation for publication of the FIRM,
Zone A usually is refined into Zones A, AO,
AH, A1-30, AE, A99, VO, V1-30, VE, or V.”
Flood Zones A, A1-30, and AE
   ZONE A - SFHAs with no BFEs
    determined

   ZONES A1-30, AE - SFHAs with BFEs
    determined
     Flood Zones AH, and AO

   ZONE AH - Shallow flooding SFHAs with
    depths of one (1) to three (3) feet and BFEs
    determined

   ZONE AO - Shallow flooding SFHAs with
    depths of one (1) to three (3) feet and
    average depths determined
             Flood Zone A99

   ZONE A99 - SFHAs to be protected
    from the 100-year flood by Federal
    flood protection system under
    construction, no BFEs determined.
            Flood Zone AR

   ZONE AR - SFHA that result from the
    de-certification of a previously
    accredited flood protection system that
    is in the process of being restored to
    provide a 100-year or greater level of
    flood protection.
     Flood Zone V, V1-30, VE

   ZONE V - Coastal SFHAs with
    velocity hazard (wave action); no
    BFEs determined.

   ZONES V1-30, VE - Coastal SFHAs
    with velocity hazard (wave action)
    and BFEs determined
            Flood Zone B

   ZONE B - Areas between the limits
    of the 100-year and 500-year floods;
    or certain areas subject to 100-year
    flooding with average depths less
    than 1-foot or where contributing
    drainage area is less than one square
    mile; or areas protected by levees
    from the 100-year flood.
        Flood Zones C and D

   ZONE C - Areas of minimal flooding

   ZONE D - Areas of undetermined, but
    possible flood hazards
             Flood Zone X
   ZONE X (shaded) - Areas of 500-year
    flood; areas of 100-year flood with
    average depths less than 1-foot or where
    contributing drainage area is less than 1-
    square-mile; or areas protected by
    levees from the 100-year flood.

   ZONE X (unshaded) - Areas determined
    to be outside the 500-year floodplain
    Definition of Base Flood
            Elevation
The water surface level of a watercourse or
waterbody, referenced to an established
datum, that corresponds to a flood event
that has a one percent chance of being
equaled or exceeded in any given year.
                                                     LEGEND
                                       LIMIT OF
                                    DETAILED STUDY
                           ZONE A
          RIVER RD




                                          ZONE X
                                                     NOTES




                       ZONE AE                         N
WEST RD
                                                      FIRM

ZONE X
                     SHADY LN
       Definition of Floodway
“...means the channel of a river or other
   watercourse and the adjacent land areas that
   must be reserved in order to discharge the
   base flood without cumulatively increasing
   the water surface elevation more than one
   foot.”
Also referred to as the “Regulatory Floodway.”
FLOODWAY SCHEMATIC


        FLOODWAY
      1 FT MAXIMUM
       SURCHARGE
FIRM Panel 0001C - Specific Location

               N
     Approximate Scale In Feet




                                                                                      Sutter Blvd.
 500           0               500
                                                                    ZONE AE                          Fort Ross Ave.



                                                                     Monterey Ave.
                                                                                                     X
                                                                     ZONE X                          RM1
                             E                D
                         Vallejo Ave.                                                                Sonoma Ave.
                                                                                                        LIMIT OF
                                                                                                     DETAILED STUDY
                   ZONE X
                                                  Fremont St.




                                                                       Bidwell St.
                                 Larkin St.




                                                                C

                                                                                                             ZONE
                                                                                                               A
                    Alvarado Ave.                                                                             A
                                                                                                       B
                                                                Sutter Blvd. bridge
          Lowest Floor...

“...means the lowest floor of the lowest
enclosed area, including basement.

An unfinished or flood resistant enclosure,
usable solely for parking of vehicles,
building access or storage in an area other
than a basement area is not considered a
building’s lowest floor...
          ... Lowest Floor

...provided that such enclosure is not built
   so as to render the structure in violation
   of the applicable non-elevation design
   requirements of this ordinance.”
Non-elevation design requirements

Flood openings: All new construction and
substantial improvement with fully enclosed
areas below the lowest floor (excluding
basements) that are usable solely for
parking of vehicles, building access or
storage, and which are subject to flooding,...

       This MEANS…
         Flood openings...

...shall be designed to automatically
equalize hydrostatic flood forces on exterior
walls by allowing for the entry and exit of
floodwater.
     Flood Opening designs
Designs for meeting this requirement must
meet or exceed the following minimum
criteria:
1. Have a minimum of two openings on
different sides with a total net area of no
less than one square inch for every square
foot of enclosed area subject to flooding; or
 ... Flood Opening designs

2. Be certified by a registered
professional engineer or architect to
comply with the guidelines for
engineered openings in FEMA Technical
Bulletin 1-93.
     ... Flood Opening designs
The bottom of all openings shall be no higher
than one foot above grade. Openings may be
equipped with screens, louvers, valves or other
coverings or devices provided that they permit
the automatic entry and exit of floodwater.
Why is the definition of Lowest
     Floor so important?

 The flood risk, and compliance of the
 structure with NFIP standards, is
 determined by the reference level of the
 lowest floor in relation to the BFE!
       Exercise:
What is the lowest floor?
      Lowest Floor = Top of Slab
                              Zone A




                                Lowest
BFE                             Floor

                 Slab
                  Fill
      Lowest Floor = Top of Slab
                               Zone AH




                              Lowest
BFE     Lowest
                              Floor
        Floor
    Lowest Floor = Top of Subfloor
                                            Zone A




BFE

                                             Lowest
Opening *
(typical)
                                             Floor


*The bottom of the openings are no higher
than one foot above the adjacent grade.
                                             Zone AE


      Lowest Floor = Top of Subfloor
BFE


                                                     Lowest
          Opening *
          (typical)                                  Floor


         *The bottom of the openings are no higher
         than one foot above the adjacent grade.
 Lowest Floor = Lowest Point Near the
   Foundation (Interior or Exterior)
                                           Zone A




BFE
                                           Lowest
                                           Floor
Opening *
(typical)



*The bottom of the openings are 3.5 feet
above the adjacent grade.
Lowest Floor = Lowest Point Near the
  Foundation (Interior or Exterior)

BFE                                           Lowest
                                              Floor
           Opening *
           (typical)



           *The bottom of the openings are 3.5 feet
           above the adjacent grade.
Lowest Floor = Lowest Grade Elevation within the
                 Crawl Space
                                                      Zone A




BFE                                                   Lowest
                                                      Floor
Opening *
(typical)


* The bottom of the openings are no   The grade elevation
higher than one foot above the        within the crawl space is
adjacent grade.                       subgrade on all four sides.
          Lowest Floor = Top of Slab

                                                   Zone A




                    Garage

BFE                                                Lowest
                                            Slab   Floor
Opening *
(typical)

*The bottom of the openings are no higher
than one foot above the adjacent grade.
   Lowest Floor = Top of Garage Slab
                                              Zone A




                    Garage
 Lowest                                     BFE
 Floor


                                            Opening *
*The bottom of the openings are no higher
                                            (typical)
than one foot above the adjacent grade.
Lowest Floor = Top of basement floor
                               Zone A



BFE
                              Lowest
                              Floor

              Basement
  Lowest Floor = Lowest Horizontal
              Member
                              Zone V




BFE                            Lowest
                               Floor
Lowest Floor = Lowest Horizontal
            Member
                            Zone V




                  Lowest
BFE
                  Floor
 Lowest Floor = Bottom of the Slab Pad
                                                             Zone V
Machinery and
Equipment is
located above the
BFE.




BFE


                                                              Lowest
                                                              Floor
                    Enclosure is 400 square feet with proper openings.
       Lowest Floor = Lowest Horizontal
                   Member
                                                                       Zone V
Machinery and
Equipment is
located above the
BFE.




BFE
                                                                      Lowest
                                                                      Floor


                    Enclosure is 300 square feet and designed with break away walls.
Lowest Floor = Bottom of the Slab Pad
                                                           Zone V




                                                           Machinery and
                                                           Equipment is
BFE                                                        located in the
                                                           enclosure.



                                                           Lowest
                                                           Floor
           Enclosure is 300 square feet and designed with break away walls.

				
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