Flood Management

  1. Countywide Flood Damage Reduction Strategies

    The multi-agency Stormwater Management Technical Group has completed a 15-year study effort to define the extent of the major flooding problems in the county. The study shows that approximately 4,000 structures are flood prone in a 100-year storm event. Much of the flooding is concentrated in the older, highly-urbanized inner beltway communities targeted for revitalization.

  2. Drainage Maintenance

    The County Office of Highway Maintenance is responsible for a wide range of activities, part of which is pipe repair and replacement, ditch and channel maintenance, inlet and drainage pipe cleaning, stormwater management facility maintenance, and maintenance of various flood control facilities.

  3. Elevation Certificates

    Elevation certificates are prepared by surveyors and document the ground elevation, floor elevation, and general building characteristics for a structure in relationship to the Base Flood Elevation.

  4. FEMA Floodplain Maps

    Download files with more information about the designated floodplain areas in Prince George's County.

  5. Flood Insurance Rate Maps & Flood Insurance

    Find flood insurance rate maps and other flood insurance information.

  6. Flood Warning Systems

    The Western Branch Comprehensive Watershed Management Plan was prepared by the Prince George’s County Stormwater Management Technical Group in 1981. Even though the U.S. Army Corps of Engineers had constructed a floodway through Upper Marlboro to carry flood waters away, certain commercial, residential, and other structure types have been found to be subject to flooding in the Upper Marlboro Area.

  7. Frequently Asked Questions

    Find answers to questions commonly asked of the Flood Management Division.

  8. GIS & Mapping Components

    Request in writing that a floodplain study be conducted by the county using GIS-based hydrology and hydraulic models with the property boundary (lot/parcel) highlighted on a tax map which clearly indicates the area of interest.

  9. Hurricane Season Special Warnings

    The warm weather of summer brings with it the start of another change in weather commonly known as “hurricane season." During this 6-month period from June through November, the likelihood for hurricanes and tropical storms that impact the eastern United States is extremely high.

  10. Introduction Flood Management

    A floodplain is an integral part of the stream system. It provides storage capacity for high flows, helps reduce the erosive power of the stream during a flood, reduces the discharge of sediment during high flow periods and helps flood waters to move downstream.

  11. Known Floodprone Structures (JPG)

    Review a map depicting the known floodprone structures in the county.

  12. Local Flood Hazards, Mapping & History of Flooding

    All waterways and bodies of water are subject to flooding - a condition that occurs when the volume of water exceeds the capacity of the waterway channels or when tidal waters are pushed inland by coastal storms.

  13. Permitting

    Qualified county staff are available at the Permit and Review Division to discuss your options and to help you plan and build a safe project while complying with the County Floodplain Management Ordinance.

  14. Preliminary Flood Insurance Rate Map

    As 1 of nearly 20,000 communities across the country, Prince George's County participates in the National Flood Insurance Program (NFIP). A major component of this program is Flood Hazard Mapping.

  15. Property Protection Projects

    Learn about the county's property protection projects (retrofitting, drainage, protecting against high wind, etc.), and substantial improvement/damage.

  16. Public Outreach

    As part of its overall floodplain management program, the county provides a number of services to local residents and businesses.

  17. Watershed Studies

    The Stormwater Management Technical Group is an interagency technical group consisting of representatives from the Department of the Environment and the Maryland-National Capital Park and Planning Commission, which has been formed to study watersheds in the County. These technical studies include analysis of existing and planned land use, watershed hydrology, stream hydraulics, topographic analysis, evaluation of flood hazard mitigation alternatives, pollutant loading analysis, analysis of various water quality control techniques, and the National Pollutant Discharge Eliminate System (NPDES) Program.