Charleston Floodplain Management

Floodplain management is the operation of a community program of preventive and corrective measures to reduce the risk of current and future flooding, resulting in a more resilient community.

Floodplain Management Banner


  • FEMA 2019 Elevation Certificate is now available. All Elevation Certificates signed and sealed on or after Feb. 21th, 2020 must be completed using the 2019 version. 
    • This version will expire on November 30th, 2022

  • Flood design elevation increase: Effective July 1st, 2020, all residential & non-residential new construction, and non-residential substantial improvements, in the Special Flood Hazard Area (SFHA) must be designed 2 ft. above Base Flood Elevation (BFE). Residential substantial improvement will remain at 1 ft. above BFE.
  • FEMA has updated the risk rating methodology for the National Flood Insurance Program (NFIP) to include additional risk factors for more equitable pricing.


(Image credit: Lincoln Co. WI, Land Services)


  • To promote, where practical, the natural functions of the floodplain
  • To reduce losses to lives and property from flooding
  • To mitigate damage to structures in the Special Flood Hazard Area (SFHA) from flooding events


  • Promote, manage, and enforce Federal Emergency Management Agency (FEMA) requirements and recommendations
  • Promote, manage, and enforce National Flood Insurance Program (NFIP) requirements and recommendations
  • Promote, manage, and expand participation in the NFIP’s Community Rating System (CRS)
  • Manage and make available Flood Insurance Rate Map (FIRM) information
  • Manage development within the Special Flood Hazard Area (SFHA)

Natural and Beneficial Floodplain Functions:

The natural functions of floodplains, when preserved or restored to their undeveloped state, provide a range of benefits to both natural and human systems. These benefits fall into the following categories: 

  1.  Water Resources:

    • Provides floodwater storage and conveyance which reduces the severity of floods or storm surge
    • Allows sediment to settle out of stormwater, attenuates excess nutrients, and supports other qualities managed under the community’s National Pollutant Discharge Elimination System (NPDES) permit 
    • Allows groundwater recharge
  2. Biologic Resources:

    • Provides habitat for feeding and reproduction for fish and wildlife species
    • Support high rates of biologic production and diversity
  3. Societal Resources:

    • Riparian and coastal vegetation helps stabilize river bank and beaches against erosion
    • Agricultural and wildlife harvesting, including shell-fish harvesting
    • Recreational and aesthetic enjoyment

Spaces which provide natural and beneficial floodplain functions in the Charleston area include salt marsh, intertidal wetlands, coastal barriers (such as dunes and maritime forest), and forested wetlands. Regulating development in these sensitive area helps to preserve their community benefit. 

Learn more about floodplain functions: Natural and Beneficial Floodplain Functions: Floodplain Management— More than Flood Loss Reduction (ASFPM, 2008)


Be sure to click on the 2022 Flood Information Guide to learn more information about flooding preparation in your neighborhood.