Laserfiche WebLink
<br />The ability of an impoundment to accomplish runoff treatment goals is directly related to basin <br />specifications and construction procedures. The efficiency and life of an impoundment are <br />directly related to the scale of up-gradient disturbance activities, and to the types of erosion and <br />runoff control measures being employed. Therefore, basin design should be performed on a <br />site-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 then:of (Figure Dom). Typical sedimentation <br />basins aze 5 to 20 acre-feet incapacity. 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 associated with their construction, sedimentation basins are normally <br />impractical for use in treaunent of small areas. <br />D•3 <br />