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practices are no longer needed.., unless otherwise author- <br />ized by the Village of Mayfield Engineering Department. <br />Trapped sediment shall be permanently stabilized to <br />prevent further erosion. <br />(n) Maintenance. All temporary and permanent erosion and <br />sediment control practices shall be maintained and <br />repaired as needed to assure continued performances of <br />their intended function. <br />V. STEAM CHANNEL EROSION <br />In order to control stream channel. erosion and sediment pollution caused <br />by increased stormwater runoff rates and volumes, stormwater runoff from <br />development areas shall be restricted. <br />(A) The peak rates of runoff after development shall be no greater than. <br />the peak rates of runoff occurring. before development for all <br />storms from one (1) to one hundred (100) year frequency. If this <br />requirement is satisfied for the one (1), two (2), five (5), ten <br />(10), twenty-five (25), fifty (50) and one Hundred. (100) year <br />frequency, all storms from one to one hundred year frequency may be <br />assumed to satisfy this requirement. <br />(B) If the volume of runoff is greater after development than before <br />development., the peak rate of runoff shall be reduced. The criti- <br />cal storm shall be determined by the. percent increase in runoff <br />volume. The peak rate of runoff from. the critical storm, and all <br />more frequent storms, shall be no greater than the peak rate of <br />runoff from one (1) year storm occurring before development. <br />Runoff rates. from less frequent storms (longer return periods) than <br />the critical storm shall satisfy the requirements in Paragraph (A) <br />of this Rule. <br />(C) The critical. storm for a specific development area is determined. as <br />follows: <br />(1) Determine the total. volume of runoff from a one (1) year <br />frequency storm, occurring on the development area before and <br />after development. <br />(2) From the volumes in Paragraph. (B) of this Rule, determine the <br />percent of increase in volume runoff due to development and, <br />using this percentage, select the critical storm form the <br />following table: <br />