Chapter 17.88 — FLOOD MANAGEMENT

The purpose of this chapter is to provide protection against flood damage for uses and service facilities in designated flood-prone areas by requiring proper design at the time of initial construction. (Ord. 1722, 6/18/2024; Ord. 1733, 2/4/2025)

The Floodplain Area Map, provided in Chapter 17.16 , Maps, identifies areas of the City subject to flooding.

(Ord. 1722, 6/18/2024; Ord. 1733, 2/4/2025)

The flood protection required by this section is based on sound engineering principles. The floodplain hazard areas are subject to flooding (one percent chance in any one year) which may result in flood losses by uses which are inadequately elevated or otherwise protected from flood damage. The regulatory provisions that follow reflect a reasonable attempt to analyze the flood hazard for specific lands. This does not imply, however, that all areas outside those designated as "FP" floodplain overlay zones will be free from flooding or flood damage. (Ord. 1722, 6/18/2024; Ord. 1733, 2/4/2025)

The following requirements shall apply in the floodplain area:

• A. No Building Permit (see § 17.100.130 , Building Permit) or other entitlement shall be issued nor shall any structure be erected unless certification is provided to the Director from a registered professional engineer that the cumulative effect of the proposed development when combined

with all other existing and anticipated development will not increase the water surface elevation of the base flood zone more than one foot at any point within the community.

• B. Residential structures shall have the lowest floor, including a basement, elevated to or above the base flood elevation as specified on the FIRM and Flood Insurance Study for the City.

• C. Nonresidential structures shall meet the requirements set forth in subsection B or be adequately flood proofed below the base flood elevation. If floodproofing is proposed, a professional engineer shall provide to the Director calculations certifying that the hydrostatic forces, velocities, uplift, and the like, have been designed for.

• D. No Building Permit (see § 17.100.130 , Building Permit) shall be issued unless satisfactory evidence has been provided to the City Engineer that new or replacement public and on-site utilities and facilities are located and constructed to minimize or eliminate flood damage and infiltration.

• E. No Building Permit (see § 17.100.130 , Building Permit) shall be issued unless satisfactory evidence is provided to the Director that all necessary permits have been received from those governmental agencies from which approval is required by Federal or State law.

• (Ord. 1722, 6/18/2024; Ord. 1733, 2/4/2025)