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A Levee Policy for the National Flood Insurance Program (1982) / Chapter Skim
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'FLOODPLAIN MAPPING APPROACHES IN LEVEE-PROTECTED AREAS'
Pages 47-64

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From page 47...
... Without levee-protected areas being identified on flood insurance maps, there might not be an information base that would permit any other means of notification to be used. The committee's recommendations focus on credited levees providing 100-year flood protection and on crediting existing levees not providing 100-year flood protection.
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From page 48...
... A Flood Insurance Study report is prepared in conjunction with the Flood Boundary and Floodway Map and describes the area studied, the engineering methods used, a summary of discharges, floodway data, flood insurance zone data, -48
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From page 49...
... Distribution of the Floodway Map and Flood Insurance Study is limited, being sent basically to the community, FEMA regional office, state coordinators, and other agencies with a direct involvement in floodplain management. The location of the levee is not noted on the Floodway Map of Figure 3, nor is the levee-protected area identified as such.
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From page 50...
... ll plinlmetrk feituret ouulde oT the floodpleen. ReTer to the Ule« oTficiil Flood lrtwrince Riu Mip Tor iny idditionil ireit oT ipeciil flood hi/ird.
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From page 52...
... FLOOD HAZARD •OUMOAMV MAC dfl FLOOO lNVUHANCI HAT! MAF I 'f FLOOO lNIUMANCB RATt MAP Hl V Riler lD i'- FLOOO lNSUKANCE KATE MAF EFFECTlVE di« thovn on ttid nip to dMirmlne vhen iriuwUl rttn iprU to ttrucium ln tnt lonet vhore elniitont or dtptht h4M botn To dmrmlne ll Hood lnturtnci b ietittble in ihh cominunllt.
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From page 54...
... Foe tdfolnin| mip pineh. wt wturtult prtnud lntfu To »Up LEGEN0 lNOEX CONTOUR lNTERME0iATE CONTOUR OEPRESSiON CONTOUR WOT ELEVATlON HORlZONTAL CONTROL POlNT VERTlCAL CONTROL POlNT HORlZONTAL - VCRTlCAL CONTROL POlNT PHOTOCENTER MATCH LiNE TO AOiOlNiNG MAPS FLOOO iNIUNANCC RATI HAP RIV»K>N«: Ritw to MM FLOOO lNSURANCE RATE MAT EFFECTlVE To d«tm.mi lT flootf tawruiM m inlibto m thb c«nuci ,out lnwrmnct «WH, M u« MM Nittotul Flood « (100I t»4«M.
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From page 56...
... Also, as previously discussed, there will probably be very few new or revised FHBMs prepared. FIRM The FIRM is for flood insurance purposes and is used to determine actuarial rates that apply to structures in the zones where flood elevations or depths have been established.
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From page 57...
... by a 100-year flood should be designated as Zone ALP. Areas between the natural 100-year flood boundary and 500-year flood boundary should be designated as Zone BLP.
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From page 58...
... d r.citK. I llood hui'd Tfcion noI dt lt'mined i hmiu ol ltii l0O-ttii tlood ind 500NOTES TOUSIR lhi» mip il lOT Hood unli thov ill irtii ill plinimtl-« ltilurti iiude tpeciil llood huird trtii mip pvwli, inr wpirilrlt ptimed lndu To Mdp Rito u itw FLOO0 lNSURANCE RATE MAP EFFECTlVE tfilt tfiown on lhk mie to dilirmln*
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From page 60...
... be called Zone ALP and that the area between the 100-year flood boundary and 500-year flood boundary be designated as Zone BLP. Since the entire area protected by a credited levee up to the 500-year flood boundary should be subject to some floodplain management measures, such as preparation of warning and evacuation plans, this entire area should be designated by a distinguishing symbol on the Floodway Map.
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From page 61...
... Floodway Map Since the Floodway Map is to facilitate floodplain management activities it needs to indicate areas where changes in floodplain management policy are recommended. Specifically, changes would involve insurance purchase requirements behind levees up to a 500-year flood design and which would, without the levee, be flooded by a 100-year flood and areas behind all levees for critical facilities regulation and emergency measure planning.
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From page 62...
... ZONEC FIGURE 5 Flood Insurance Rate Map Showing -- Levee Protected Areas -62
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From page 63...
... Therefore, no change is recommended for portraying the hazard areas on the Floodway Map. EVACUATION ROUTES Consideration was given to showing evacuation routes on FEMA maps.
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From page 64...
... For this reason FEMA should make sure that interior drainage evaluation is coordinated with evaluation of river-related flooding. The committee recommends: • Interior drainage situations on the landside of levees should be analyzed in conjunction with the riverine flood analysis, and the areas flooded by interior drainage should be shown on FEMA maps in accordance with current practice.
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Key Terms

  • floodway map
  • flood boundary
  • floodplain management
  • interior drainage
  • evacuation routes

  • flood hazard
  • insurance rate
  • rate map
  • national flood
  • insurance maps

  • levees providing
  • insurance program
  • fema maps
  • credited levees
  • management measures

  • representative flood
  • floodway maps
  • emergency program
  • zone alp
  • flood protection

  • flood stage
  • insurance study
  • boundary map
  • credited levee
  • map prepared

  • zone blp
  • hazard boundary
  • existing levees
  • regular program
  • provide protection


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