CAO draft updates aquifer, geologic and floodplain rules; aligns flood language with FEMA

Consultants told the Planning Commission the CAO update includes targeted updates to critical aquifer recharge area rules, geologically hazardous area language and a substantial modernization of the frequently flooded areas chapter. For aquifer recharge areas, the draft clarifies that negative impacts should be avoided and that mitigation to offset aquifer impacts is not appropriate; instead, the code emphasizes best management practices and prevention.

On geologically hazardous areas the update adds channel migration zones as an erosion hazard category and aligns the CAO's review distance with buffer standards. Douglas Yormick explained the frequently flooded areas section was comprehensively revised with FEMA terminology—base flood elevation, floodway standards, substantial improvement and lowest floor elevation—so the county can adopt FEMA's forthcoming flood insurance study and rate maps (expected later in the year) without patch amendments. "This positions the County for seamless adoption once the flood insurance study and flood insurance rate maps become effective," Yormick said. Commissioners had no substantive objections but asked staff to confirm references and crosswalk language in the redline draft.