2021-093 Ordinance - Laserfiche WebLink

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EXHIBIT A: CHAPTER 928 function as an integrated system that controls flooding and minimizes the degradation of the physical, biological, and chemical integrity of the water resources receiving stormwater discharges from the site. Acceptable practices 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. 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. e. 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. SCMs that meet the criteria in this regulation, and additional criteria required by the City Engineer, shall comply with this regulation. 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. 4. Stormwater facilities in water resources: SCMs and related activities shall not be constructed in water resources unless the applicant shows proof of compliance with all appropriate permits from the Ohio EPA, the U.S. Army Corps, and other applicable federal, state, and local agencies as required in Section 928.07 of this regulation, and the activity is in compliance with Chapter 927 Erosion and Sediment Control and Chapter 926 Riparian Setbacks and Wetland Setbacks, all as determined by the City Engineer. Stormwater ponds and surface conveyance channels: All stormwater pond and surface conveyance designs must provide a minimum of one (1) foot freeboard above the projected peak stage within the facility during the 100 -year, 24-hour