12-14-2022 Council Packet - Laserfiche WebLink

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SECTION 2. The City Council of the City of Little Canada hereby amends Chapter 928 of the Little Canada Zoning Code by deleting and adding the following language: 928. STORMWATER MANAGEMENT A. Stormwater Management Performance Standards and Design Criteria The applicant shall consider reducing the need for stormwater management performance standards by incorporating the use of natural topography and land cover such as natural swales and depressions as they exist before development to the degree that they can accommodate the additional flow of water without compromising the integrity or quality of the receiving waterbody. The development shall minimize impact to significant natural features. Review the site for steep slopes (greater than 12%), wetlands, wooded areas of significance, rare and endangered species habitat, areas designated by the County Biological Survey, metro greenways, or County parks and open space. These areas should not be developed. The development shall limit impervious surface coverage. Impervious surface coverage of a site shall not exceed that allowed by City Ordinance. Proposed design, suggested location and phased implementation of effective, practicable stormwater management measures for plans shall be designed, engineered and implemented to achieve the following results: 1. Volume Control - Stormwater runoff volume retention shall be achieved onsite in the amount equivalent to the runoff generated from a one inch rainfall over the impervious surfaces of the development for new development and redevelopment from a half inch rainfall over the impervious surfaces of the development for redevelopment. The required stormwater runoff volume reduction shall be calculated as follows: New Development and Redevelopment (excluding linear projects) Required Volume (ft3) = Impervious surfaces (ft2) x 1.0 (in) x 0.9 coefficient x 1/12 (ft/in) Redevelopment Required Volume (ft3) = Impervious surfaces (ft2) x 0.5 (in) x 0.9 coefficient x 1/12 (ft/in) Linear Projects The water quality volume must be calculated as the larger of one (1) inch times the new impervious surface or one-(0.5) inch times the sum of the new and the fully reconstructed impervious surface. Where the entire water quality volume cannot be treated within the existing right-of-way, a reasonable attempt to obtain additional right-of-way, easement, or other permission to treat the stormwater during the project planning process must be made. Volume reduction practices must be considered first. Volume reduction practices are not required if the practices cannot be provided cost effectively. If additional right-of- way, easements, or other permission cannot be obtained, owners of construction activity must maximize the treatment of the water quality volume prior to discharge from the MS4.