Floodplain Management

Floodplain corridors that experience natural base flows with hydraulic connectivity to uplands supports a diverse ecology that in turn leads to a healthy floodplain. Our floodplain management services includes Hydrology & Hydraulics, Flood Studies, Riparian/Stream Resortoration and Hydrograph Modification. In addition, we provide a suite of Flood Hazard Mitigation services as well.

Hydrology & Hydraulics

At the core of flood control, floodplain management, water conservation and water reclamation projects is the use of Hydrologic, Hydraulic and Sediment Transport Analyses . HELM's key area of expertise in Hydrology and Hydraulics with an emphasis on numerical modeling.

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Flood Studies

HELM engineers have an extensive history of partnering with local, county and Federal agencies in the preparation and submittal of FEMA flood hazard maps and non-regulatory Risk MAP products. We have completed FEMA floodplain mapping and flood risk classification for riparian/channel corridors, highly urbanized areas, rural and agricultural areas, highly braided and distributary drainage systems, and large alluvial fan landforms.

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Riparian/Stream Restoration

HELM can provide functional design treatments within riparian areas as well as within upstream developments. The treatments within riparian areas may consist of tree plantings, rock or log vanes, plant removal, ground cover, and induced meandering. Treatments within urban developments may include various best management or integrated management practices that would decentralize the management of stormwater by slowing, capturing and treating it as it flows through developments before discharging to riparian corridors.

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Hydrograph Modification

HELM offers expertise in development of hydrograph modification management plans (HMPs) that can be implemented so that runoff from urbanization will not exceed flowrates or duration when compared to runoff patterns prior to developed conditions. HMPs provide a blue-print for strategic use of Low Impact Development infrastructure that incorporates either best management practices or integrated management practices within urbanized watersheds.

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