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I <br /> <br />GUIDELINES FOR EROSION, SEDIMENTATION AND RUNOFF CONTROL <br /> <br />1. KEEP DISTURBED AREAS SMALL <br /> <br /> Careful site or corridor selection will help on this point. The site <br />or corridor should be able to accommodate the development with a minimum <br />of grading. <br /> <br /> The development plan must be made to fit the topographic, soil, and <br />vegetative characteristics with a minimum of clearing and grading. Natural <br />cover should be retained and protected whenever possible, critically <br />erodible soil, steep slopes, stream banks, and drainageways Should be <br />identified. Development can then be planned to minimize disturbance of <br />these vulnerable areas. <br /> <br /> Where earth movement and removal of vegetation are necessary, keep <br />the area and duration of exposure to a minimum. Plan the phases of <br />development so that only the areas which are actively being developed are <br />exposed. All other areas should have a good cover of vegetation or mulch. <br /> <br />2. STABILIZE AND PROTECT DISTURBED AREAS AS SOON AS POSSIBLE <br /> <br /> Two methods are available for stabilizing disturbed,areas: mechanical <br /> (or structual) methods and vegetative methods. In some cases, both of <br /> these two methods are combined in order to retard erosion. <br /> <br />KEEP SIORM WATER RUNOFF VELOCITIES LOW <br /> <br />The removal of existing vegetative cover and the increase in impermeable <br /> <br />surface area during development will increase both the volume and velocity <br />of runoff. These increases must be taken into account whenI providing for <br />erosion control. <br /> <br /> Slope changes should be designed to keep slope length and gradient to <br />a minimum. Short slopes, low gradients, and the preservation of natural <br /> <br />.~ , <br />vegetative cover can keep storm water velocities low. This measure will <br /> <br />limit erosion hazards. <br /> <br /> <br />