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~. <br />Ordinance No. 2006-16 <br />,. <br />(d) Map: A map of the entire site showing the overall development. <br />(e) BMPs: Best Management Practices used in the Post-Construction Water Quality Plan <br />may include but are not limited to: <br />(1) Permanent Storm Water Detention ponds that provide extended detention of the <br />water volume. <br />(2) Flow attenuation by use of open vegetated swales and natural depressions <br />(3) Onsite infiltration of runoff <br />(4) Sequential systems that combine several practices <br />(5) Permanent conservation easements, preferably with the easement being held by <br />a third party with no vested interest in ever seeing the property developed <br />(6) Natural Channel Design for drainageways <br />(7) Bioengineering in drainage ways <br />(8) Recreating floodplains <br />(9) Chemical and biological filters in storm sewer inlets <br />(10) Sand Filters <br />(11) Low Impact Development Design including bioretention areas, grassed <br />a) Aquatic benches in Retention Basins and ponds. <br />b) For redevelopment projects, ensure a 20 percent net reduction of the site <br />impervious area. <br />(6) Technical Basis: The plans will contain a rational statement utilized to select the <br />BMPs used to control pollution and to maintain and protect water quality. <br />928.06 DEVELOPMENT SITES 5 ACRES OR LARGER. A development site that <br />disturbs five (5) or more acres of land or will disturb less than five (5) acres, but is a art of a <br />larger common plan of development or sale, which will disturb five (5) or more acres of land <br />shall identify: <br />(a) Storm Water Detention: The Post-Construction BMP(s) chosen must be able to detain <br />storm water runoff for protection of the stream channels, stream erosion control, and improved <br />water quality. <br />(b) Structural BMPs: Structural (designed) Post-Construction storm water treatment <br />practices shall be incorporated into the permanent drainage system for the site. <br />(c) Properly Sized BMPs: The BMP(s) chosen must be sized to treat the water quality <br />volume (WQ~) and ensure compliance with Ohio's Water Quality Standards in OAC Chapter <br />3745-1. The WQ~ shall be equivalent to the volume of runoff from a 0.75-inch rainfall and shall <br />be determined according to one of the two following methods: <br />11 <br />