2021-093 Ordinance - Laserfiche WebLink

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A. General: The stormwater system, including SCMs for storage, treatment and control, and conveyance facilities, shall be designed to prevent structure flooding during the 100 -year, 24-hour storm event; to maintain predevelopment runoff patterns, flows, and volumes; to meet the requirements of the Construction General Permit; and to meet the following criteria: Integrated SCMs that address degradation of water resources. The SCMs shall function as an integrated system that controls flooding and minimizes the degradation of the water resources receiving stormwater discharges from the site. Acceptable SCMs shall: a. Not disturb riparian areas, unless the disturbance is intended to support a watercourse restoration project and complies with Chapter 926 Riparian Setbacks and Wetland Setbacks. b. Maintain predevelopment hydrology and groundwater recharge on as much of the site as practicable. Where feasible, bioretention, permeable pavement with infiltration, underground storage with infiltration, infiltration trenches, infiltration basins and/or rainwater harvesting must be the water quality SCMs used. Separate SCMs may be used for peak discharge control and water quality treatment. C. Only install new impervious surfaces and compact soils where necessary to support the future land use. d. Compensate for increased runoff volumes caused by new impervious surfaces and soil compaction by reducing stormwater peak flows to less than predevelopment levels. Be designed according to the methodology included in the most current edition of Rainwater and Land Development or another design manual acceptable for use by the City of North Olmsted and Ohio EPA. 2. Practices designed for final use: SCMs shall be designed to achieve the stormwater management objectives of this regulation, to be compatible with the proposed post -construction use of the site, to protect the public health, safety and welfare, and to function safely with routine maintenance. Stormwater management for all lots: Areas developed for a subdivision, as defined in Chapter 1 101 Subdivision Regulations, shall provide stormwater management and water quality controls for the development of all subdivided lots. This shall include provisions for lot grading and drainage that prevent structure flooding during the 100 -year, 24-hour storm; and maintain, to the extent practicable, the pre -development runoff patterns, volumes and peaks from each lot.