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accordance with Inspection and Maintenance Agreements approved by the <br />Mayfield Village Engineer as detailed in Section 1128.08. <br />8. Ownership: Unless otherwise required by Mayfield Village, storm water <br />management practices serving multiple lots in subdivisions shall be on a separate <br />]ot held and maintained by an entity of common ownership or, if compensated by <br />the property owners, by Mayfield Village. Storm water management practices <br />serving single lots shall be placed on these lots, protected within an easement, and <br />maintained by the property owner. <br />9. Preservation of Existing Natural Drainage. Practices that preserve and/or improve <br />the existing natural drainage shall be used to the maximum extent practicable. Such <br />practices may include minimizing site grading and compaction; protecting and/or <br />restoring water resources, riparian areas, and existing vegetation; and maintaining <br />unconcentrated storm water runoff to and through these areas. <br />10. Preservation of Wetland Hydrology: Concentrated storm water runoff from BMPs <br />to wetlands shall be converted to diffuse flow before the runoff enters a wetland in <br />order to protect the natural hydrology, hydroperiod, and wetland flora. The flow <br />shall be released such that no erosion occurs down slope. Practices such as level <br />spreaders, vegetative buffers, infiltration basins, conservation of forest covers, and <br />the preservation of intermittent streams, depressions, and drainage corridors may be <br />used to maintain the wetland hydrology. <br />If the applicant proposes to discharge to natural wetlands, a hydrological analysis <br />shall be preformed to demonstrate that the proposed discharge matches the pre- <br />development hydroperiods and hydrodynamics. <br />B. Storm Water Conveyance Design Criteria: All storm water management practices shall be <br />designed to convey storm water to allow for the maximum removal of pollutants and <br />reduction in flow velocities. This shall include but not be limited to: <br />1. Stream relocation or enclosure: The Mayfield Village Engineer may allow the <br />enclosure or relocation of water resources only if the applicant shows proof of <br />compliance with all appropriate permits from the Ohio EPA, the U.S. Army Corps, <br />and other applicable federal, state, and local agencies as required in Section <br />1128.07 of this regulation, and the activity is in compliance with Section 1129 <br />Mayfield Village's Erosion and Sediment Control requirements as determined by <br />the Mayfield Village Engineer. At a minimum, stream relocation designs must <br />show how the project will minimize changes to the vertical stability, floodplain <br />form, channel form, and habitat of upstream and downstream channels on and off <br />the property <br />2. Off-site storm water discharges: Off=site storm water runoff that discharges to or <br />across the applicant's development site shall be conveyed through the storm water <br />conveyance system planned for the development site at its existing peak flow rates <br />during each design storm. Off-site flows shall be diverted around storm water <br />quality control facilities or, if this in not possible, the storm water quality control <br />facility shall be sized to treat the off-site flow. Comprehensive Storm Water <br />Management Plans will not be approved until it is demonstrated to the satisfaction <br />of the Mayfield Village Engineer that off-site runoff will be adequately conveyed <br />through the development site in a manner that does not exacerbate upstream or <br />