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PMC Title 16 (Buildings and Construction) and Chapter 24.20 PMC (Flood Hazard Protection) regulate proposed activities in all areas of special flood hazards. If allowed, any structures permitted in the designated flood areas are subject to the flood-proofing regulations provided in PMC Title 16 and Chapter 24.20 PMC.

(1) Floodways. Special flood hazard areas established in this section are areas that are extremely hazardous areas due to the velocity of flood waters, which carry debris, potential projectiles, and erosion potential. The following provisions apply to special flood hazard areas:

(a) Prohibit encroachments, including fill, new construction, substantial improvements, and other development unless certification by a registered engineer or architect is provided demonstrating that encroachments shall not result in an increase in flood levels during the occurrence of the base flood discharge.

(b) If subsection (1)(a) of this section is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of Chapter 24.20 PMC. [Ord. 4525A § 1, 2021; Ord. 4525 § 1, 2021; Ord. 3911 § 2, 2009; Code 1970 § 28.28.040.]