(A) Design Criteria: The Planning Commission shall not recommend the approval of plat unless, the Services Director of Engineering Services and Director of Development Services determine that the proposed provisions for stormwater drainage are adequate within boundaries of the subdivision. Drainage improvements in the subdivision shall be coordinated with existing and planned drainage improvements elsewhere so as to form an integrated City system. The stormwater drainage system shall be separate and independent of the sanitary sewer system and shall meet the following design criteria:
1. Principal and minor arterial streets:
(a) Flow from a "10-year storm" shall not inundate the center twenty feet (20') of the pavement.
(b) Flow from a "50-year storm" shall be carried without damage to any building.
2. Collector streets:
(a) Flow from a "10-year storm" shall not inundate the center ten feet (10') of the pavement.
(b) Flow from a "50-year storm" shall be carried without damage to any building.
3. Local streets:
(a) Flow from a "10-year storm" shall not top the curb.
(b) Flow from a "50-year storm" shall be carried without damage to any building.
(B) Catch Basins Or Inlets: Catch basins or inlets, if required, shall be constructed so that the majority of surface water shall be intercepted before reaching the intersection, and not carried for a distance of more than four hundred feet (400') of the pavement.
(C) Accommodation Of Upstream Drainage Areas: A culvert or other drainage facility large enough to accommodate potential runoff from the entire drainage area upstream from the proposed subdivision shall be provided in accordance with the City's standard specifications. Potential runoff shall be determined on the basis of the maximum development of the upstream area that is permitted or to be permitted under the Comprehensive Plan.
(D) Areas Subject To Flooding: Whenever a plat is submitted for an area that is subject to flooding, the City Council may require appropriate protective measures, including the filling of the flood prone area to a level equal to the regulatory flood elevation, if any. (Ord. 91-2, 1-21-1991; amd. Ord. 18-08, 6-3-2019)