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Staff proposes raising finished-floor elevation to 3 feet above base flood elevation for new homes in floodplain
Summary
Planning staff proposed increasing the required finished floor elevation (FFE) for new structures in the county's floodplain from the federal minimum of 1 foot above base flood elevation to 3 feet, citing increased flooding frequency and regional precedent.
Planning staff proposed raising the required finished floor elevation (FFE) for new construction within the county's mapped AE (1% annual chance) flood zone from the federal minimum of 1 foot above base flood elevation to 3 feet. Staff said several nearby jurisdictions have adopted higher locally required elevational standards and argued the change would reduce flood damage risk for new construction.
Why this matters: staff said flood events have become more frequent in several local watersheds and that the federal minimum elevation used by FEMA is intended for the National Flood Insurance Program rather than local life-safety protection. By requiring a higher FFE, staff said new homes would be built with a larger margin of safety above the mapped base flood elevation.
Details discussed: - Proposed standard: raise FFE requirement from 1 foot to 3 feet above the base flood elevation in AE zones for new houses within the floodplain. - Engineering consequences: commissioners and staff discussed how raising the FFE typically affects foundation design (crawl space/block courses, flood vents, or raised slab foundations) and that additional adjustments could be required for HVAC and ductwork placement. Staff said in some cases no-rise certifications or engineered fill could be required to ensure no off-site hydraulic impacts. - Property impacts: commissioners asked how many platted lots would be affected and whether raising the FFE would materially change lot values or the ability to build; staff said many lots are only partly in mapped floodplains and that flood maps are periodically revised.
No vote was taken. Staff characterized the proposal as a modest but impactful technical change intended to reduce future flood losses; commissioners asked staff to provide an analysis of the number of lots affected and practical building-cost estimates before formal action.
Ending: Staff will return with parcel counts and implementation details for further review and potential formal action at a later meeting.
