Floodplain Management

The Flood Control District develops flood hazard mapping and provides data and support to assist floodplain administrators in effectively managing activity within high flood risk areas. As a Federal Emergency Management Agency (FEMA) Cooperating Technical Partner, the District also works with FEMA to develop new flood hazard zones, review modifications to flood hazard zones due to projects, and update FIRM maps. This partnership ensures local knowledge of the stream and potential flood risk are incorporated in the work products.

For floodplain mapping and information regarding flood insurance, please see our Flood Safety Page under the Community Info menu.

District Floodplain Mapping

Using the best information available, the Flood Control District maps floodplains and assists local governments to identify and update flood risk potential and floodplain boundaries due to both natural and anthropogenic changes that occur over time. This is done through Flood Hazard Area Delineation (FHAD) studies. FHADs are often performed in concurrence with updates to Master Drainage Plan (MDP) studies. Access floodplain maps via the Data Viewer map.

From local floodplain study to FEMA FIRM

The Flood Control District works with FEMA to incorporate FHAD data into the Flood Insurance Rate Maps (FIRMs) and Flood Insurance Studies (FISs) through the Physical Map Revision (PMR) process. Several PMR projects are currently underway. Links below provide specific information for ongoing PMR projects.

Current Physical Map Revisions:

Processing changes to FIRMs

As a CTP receiving grant funding from FEMA, the district reviews requests for Letters of Map Change (LOMC) at the local level. See the LOMC Database for the status of specific projects and the LOMR/CLOMR submittal guidelines when submitting these items for review.

Fact Sheets:

Other Floodplain Management Resources