(a) Criteria for Stormwater Management Plans. A stormwater management plan shall be submitted for review on all subdivisions, proposed planned developments, or site plans. The stormwater management plan shall be designed to the satisfaction of the city utilities department assistant director for engineering, and in a manner consistent with the capacity of downstream facilities. The stormwater management plan shall conform to the following criteria:


(1) The existing natural drainage system shall be utilized to the maximum extent possible.
(2) Finished land grades shall be such that there is no ponding of water on the land and that surface water will not cause erosion. This shall not be considered to prohibit stormwater retention facilities or other decorative ponds.
(3) The natural vegetation shall be utilized where possible to prevent the concentration of surface water run-off.
(4) Any planned stormwater management construction shall be integrated into the drainage pattern of surrounding properties.
(5) Except for swales used to carry runoff to storm sewer inlets, natural drainage ways, stormwater retention facilities, and stormwater quality mitigation measures, the construction of open ditches is prohibited.
(6) Stormwater detention shall be utilized to limit runoff to pre-development rates, where the city utilities department assistant director for engineering determines that detention is necessary in consideration of downstream capacity and the impacts of the proposed development.
(7) The stormwater management plan shall be designed to conform to standards that may be established by the utilities service board and additional recommendations of the city engineer and city utilities department assistant director for engineering.
(b) Review of Stormwater Management Plans. The city utilities department assistant director for engineering shall review stormwater management plans. Each petitioner shall furnish a set of the stormwater management plan with the application for approval of any proposed subdivision, planned unit development or site plan. Approval of the stormwater management plan will be based upon, but not limited to, consideration of the following items:
(1) Culvert and storm sewer size and placement;
(2) Grade stabilizing structures;
(3) Curb elevations on streets used as part of the stormwater management system;
(4) Stormwater retention; and
(5) Stormwater runoff quality.
(Ord. 98-41 § 1, 1998: Ord. 97-16 §§ 1--13, 1997; Ord. 95-21 § 3 (part), 1995).