No Rise and The Letter of Map Revision

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Through participation in the FEMA national flood insurance program, Local Jurisdictions in floodplains evaluate "Development Project" in floodplains. Floodplain Restoration is considered a development project. If the project increases flood elevation as defined by a model, the project must complete a process that revises the flood map, beginning with a Conditional Letter of Map Revision (CLOMR or "clow-mer") and concluding with a Letter of Map Revision, or LOMR (Low-mer). In particular Engineered Log Jams are intended to interact with flow, causing backwatering, and increasing floodplain engagement, and if designed to NOT increase flood elevation are less effective in achieving restoration goals. The .

Notes

• In 2024, Puget Sound Partnership published a Webmap describing some of these issues.