Located within areas of special flood hazard established in PMC 24.12.020 are areas extremely hazardous area due to the velocity of flood waters which carry debris, potential projectiles, and erosion potential, the following provisions apply:
(1) Prohibit encroachments, including fill, new construction, substantial improvements, and other development unless certification by a registered professional 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.
(2) If subsection (1) of this section is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of this chapter. [Ord. 2648 § 5, 1987; Code 1970 § 24.20.130.]