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All applicants required to obtain approval of a stormwater management plan must develop and submit a proposed stormwater management plan, which must address stormwater management for the development that meets all the requirements of this chapter. All such stormwater management shall be consistent with the Rhode Island Stormwater Design and Installation Standards Manual and the Rhode Island Soil Erosion and Sediment Control Handbook, as amended. (1)
Performance standards. Stormwater management plans shall incorporate best management practices for water quality control, which in combination are demonstrated to reduce the average annual total suspended solids in post-development runoff by 80 percent. Development in groundwater overlay districts or watersheds where impaired waters as defined by the state's 303(d) list exist may be held to higher standards.
(2)
Disallowed stormwater best management practices. The placement of detention basins and other stormwater structures within a floodplain shall be avoided. If there is no alternative, the applicant must show what effects, if any, the tailwaters created by the floodplain will have on the outflow and effective storage capacity of the detention facility.
(3)
Facilitation of maintenance. Facilities that require maintenance shall be designed to minimize the need for regular maintenance, facilitate required maintenance, and ensure accessibility of components that require maintenance. At a minimum, all stormwater management plans must incorporate best management practices with appropriate maintenance design in accordance with the Rhode Island Stormwater Design and Installation Standards Manual, as amended; or the Rhode Island Soil Erosion and Sediment Control Handbook, as amended.
(Ord. of 3-7-22, § 3)