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The ability of an impoundment to accomplish nmoff treatmern goals is directly reiated to basin <br />specifications and construction procedures. The efficiency and Gfe of an unpoundment are <br />dimly related to the scale of up-gredient disturbance activities, and to the types of erosion and <br />runoff control measures being employed. Therefore, basin design should be performed on a <br />sits-specific basis taking into account local environmental factors . <br />A designed catchment basin or impoundment may be incised, formed by anabove-ground <br />embankment, or formed by some combination thereof figure Dom). Typical sedimentation <br />basins are 5 to 20 acre-feet in capacity. Sedimentation basins are the preferred treatment <br />method for areas that remain disturbed for extended periods of time. Typically they are used to <br />treat runoff from facilities areas, but they may be used to treat runoff from any type of <br />disturbance area. However, because of their size, construction costs and the additional <br />disturbance area assceiated with their constnrction, sedimentation basins are normally <br />impractical for use in treatment of small areas. <br /> <br />i <br />Ili <br />