Rules for building near streams, rivers, and drainage facilities

A. Applications involving developments encompassing or adjoining any stream, river, or drainage facility outside of the special flood hazard areas identified on the FIRM will be subject to review by the director. On request by the director, further information concerning base flood elevation, floodways, surface water runoff, existing and proposed drainage patterns, and other information, including a detailed flood elevation study, drainage report, and findings and opinions by an engineer must be provided to evaluate the potential flooding of the area. B. The director must not issue or recommend issuance of any permit or approval involving modification, construction, lining, or alteration of any drainage facility, river, or stream unless the modification, construction, lining, or alteration does not reduce the capacity of the drainage facility, river, or stream, or adversely affect any downstream or adjacent property. C. New construction and substantial improvements encompassing or adjoining any stream, river, or drainage facility outside of the special flood hazard areas must conform to sections 16.29.050 and 16.29.060 . ( Ord. No. 5603 , § 3, 2024)