Wyandotte County, KS Environmental Rules: Flood Zones (2026)

Section 27-550 applies the floodplain subdivision to every parcel identified as a numbered or unnumbered A zone, AE, AO, or AH zone on the FIRM index map dated September 2, 2015, as amended. No development, including grading, filling, or placing a manufactured home, may proceed in those zones without a floodplain development permit issued by the unified government board of commissioners or its designee, and § 27-551 makes the director of planning the floodplain administrator responsible for reviewing every application. An applicant must describe the land by lot and address, identify the work, state the assessed value and fair market improvement value, disclose whether the site sits in the floodway or flood fringe, and supply the existing base flood elevation alongside the elevation of the proposed development.

The administrator also coordinates with the Kansas Division of Water Resources before any watercourse is altered or relocated and keeps records of the certified lowest-floor elevation for every new or substantially improved structure. Storage of buoyant, flammable, or explosive material in the special flood hazard area is flatly prohibited under § 27-552(a)(5), and any nonconforming structure that goes unused for 18 consecutive months loses its nonconforming status.