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<br />flood plain of the major streams, and in all instances the floor slab <br />of any structure or public works will be located at least l-1/2 feet <br />above the lOO-year flood level under developed conditions. <br />. The developers recognized that the tendency will be towards increasing <br />the amount and the rate of runoff and that the quality of the runoff will <br />be lower. To counter these effects it is planned to include on-site <br />detention, the use of local storage reservoirs. erosion control features, <br /> <br />and strict control on the use of fertilizers and pesticides. In addition, <br />since the ground water will be the water supply for the area, recharge <br />areas are preserved and drainage is encouraged to percolate to keep ground <br />water levels up. Also treated sewage is planned to be returned to surface <br />water for recreation uses. <br /> <br />The primary Objective is to retain the rain where it falls and <br />encourage infiltration by utilizing the natural drainage system in its <br />unimproved state. The wide, shallow swales will be pr.eserved and native <br />vegetation encouraged to retard flow. Small ponds and berms will be <br />provided and drainage pipes will be used only where the natural system <br />is inadequate. <br />It is anticipated that the system will be only about half as costly <br />(on a unit basis) as a normal drainage system and the deve'lOfllllent is <br />expected to be equally profitable to its developers. Cost for the usual <br />drainage systems in this area have averaged near $1,200 per acre and the <br />proposal is expected to cost about $600 per acre ($380,OOO per mi2). <br /> <br />29 <br />