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ORDINANCE N0. 91-38 <br />early part of such a storm and perhaps the twenty-five or fifty- <br />year storm control may adequately address the situation. There are <br />many variables which affect the stormwater runoff pattern - soil <br />type, slope, kind of cover, percent impervious cover, kind of <br />disturbance and compaction. The one-hundred year storm needs to be <br />examined in a development situation to determine its specific <br />effect. Emergency flow areas and emergency outlets from structural <br />work need to account for such storms anyway if we don't want <br />basements full of water and structures failing. The additional <br />control necessary for the one-hundred-year frequency storm is not <br />a highly significant factor in storm water management for <br />accelerated runoff control. <br />In addition to controlling channel erosion, this standard <br />should make long range planning for stormwater management easier. <br />Storm sewers and stream channels can be designed in accordance with <br />existing runoff conditions knowing that upstream runoff rates <br />cannot be increased. This standard would also prevent an increase <br />in flood levels and frequencies below future developments and, in <br />many cases, reduce development costs because of reduced storm sewer <br />size, particularly where multiple use detention facilities can be <br />utilized in designated open space. <br />A uniform standard for determining runoff would be helpful in <br />designing to meet this standard. We are requiring the U.S. Soil <br />Conservation Service procedures in Technical Release No. 55, latest <br />7