MAPPING HAZARDS AND RISK

FEMA FLOOD MAPPING PROCESS

National Flood Insurance Program


A voluntary program based on a mutual agreement between the Federal government and the local community.

In exchange for adopting and enforcing floodplain management regulations, Federally-backed flood insurance is made available to property owners throughout the community.

 National Flood Insurance Program 

MAPPING

INSURANCE

REGULATIONS

Floodplain Mapping Standards 

Topography

Aerial Mapping

LiDAR

Survey

Hydrology

The quantity of water that must pass a given point

Hydraulics

The configuration and “roughness” of the channel and adjacent overbank area that must carry that water

 

Limitations

Hydraulics

  • Vegetation 
  • Aggregation
  • Degradation
  • Erosion
  • Debris
  • Man-made features
    • Bridges/Culverts
    • Flood debris
    • Human response to flooding

City of Boulder - Twomile Canyon Creek

Next Steps........?

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