(1) No encroachment, including fill or excavation, new construction, substantial improvements, bridges, utilities, bulkheads, diking, retaining walls, or other flood management control devices shall be placed in the floodway unless certification by a registered professional civil engineer is provided demonstrating through hydrologic analyses performed in accordance with standard engineering practice that the encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge.

(2) Residential structures located in the floodway prior to December 21, 1978, may be repaired, reconstructed, or improved if (a) the ground flood area is not increased; and (b) the cost of the repair, reconstruction, or improvement does not exceed fifty (50) percent of the market value of the structure either (i) before the repair, reconstruction, or improvement is started, or (ii) if the structure has been damaged and is being restored, before the damage occurred. Work done on structures to comply with existing health, sanitary, or safety codes which have been identified by the local code enforcement official and which are the minimum necessary to assure safe living conditions, or to structures identified as historic places on a local, state, or national registry, shall not be included in the fifty (50) percent.

(3) All construction, development, or substantial improvements shall be located so as to allow for cleaning, removal of obstructions and debris, and any other maintenance of the channel of the stream as it is located or likely to be relocated.

(4) No manufactured home shall be allowed to remain in the floodway. (Ord. 10-2 §5, 2010; Ord. 89-10 §§3 & 4, 1989; Ord. 89-1 §6, 1989; Ord. 87-9 §1, 1987).