Floodplain Mapping for Bundicks Branch

DNREC and the federal government are working on an update of the floodplain maps for Bundicks Branch, located west of Lewes, in Sussex County. The study involves new data and engineering models. The floodplain map update will occur through a process called a Letter of Map Revision (LOMR).

The Bundicks Branch Letter of Map Revision, as described in a public notice published on May 8, 2022, became effective on October 13, 2022.

Image of a wetland area in a woodland.

DNREC gathered input on the project from residents and property owners during the summer of 2021. A consultant had developed a proposed update to the Bundicks Branch floodplain mapping for review by FEMA.

Please contact the DNREC Floodplain Management Program at 302-739-9921 for more information on the project.

A Letter of Map Revision

Floodplain mapping for Bundicks Branch has been revised through a FEMA process called a Letter of Map Revision (LOMR). Revising a floodplain map involves data analysis and modeling. New mapping is developed using topographic data along with engineering models.

Prior to the revision, the Bundicks Branch floodplain mapping was generated using approximate modeling methods.

The updated mapping is based on more detailed modeling methods and includes base flood elevations. Base Flood Elevations are estimated 1 percent annual chance flood elevations (also known as 100-year flood elevations).

Revised Mapping

New floodplain maps have been developed in accordance with this LOMR. This new mapping became effective in October of 2022.

Essentially, the zone A portion of Bundicks Branch, which had been mapped using approximate methods, is now an AE zone.

Flood Insurance

Homeowners insurance does not cover flood damage. Flood insurance in available through the National Flood Insurance Program (NFIP).

Homes that are within Special Flood Hazard Areas that have federally-backed mortgages must purchase flood insurance. Changes to the Bundicks Branch floodplain maps may have flood insurance implications for local homeowners.

Owners of homes newly mapped into the floodplain may have to buy flood insurance now that the map revisions are effective. Some may find their homes no longer in the mapped floodplain. They may be eligible for lower cost flood insurance.

For more information about flood insurance, contact your insurance provider or learn more at