New development shall not reduce the effective flood storage volume of the regulatory floodplain. A development proposal shall provide compensatory storage if grading or other activity eliminates any effective flood storage volume. Compensatory storage shall:
(a) Provide equivalent volume at equivalent elevations within the same drainage basin that is being displaced. For this purpose, "equivalent elevation" means having a similar relationship to ordinary high water and to the best available ten-year, 50-year, and 100-year water surface profiles; and
(b) Be hydraulically connected to the source of flooding; and
(c) Provide compensatory storage in the same construction season as when the displacement of flood storage volume occurs and before the flood season begins; and
(d) The newly created storage area shall be graded and vegetated to allow fish access during flood events without creating fish stranding sites.
(Ord. 77-21, passed 7-6-2021)