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Chapter 4-Site-Speciflc?ndustria/ Storm Water BMPs <br />Level ;Spreaders . <br />I What Are They <br />n <br />Level spreaders are devices used at storm water outlets to spread out collected storm water flows <br />into sheetflow (runoff that flows over ground surface in a thin, even layer). Typically, a level <br />spreader consists of a depression in the soil surface that spreads the flow onto a flat area across a <br />gentle slope. Level spreaders then release the storm water flow onto level areas stabilized by <br />vegetation to reduce speed and increase infiltration. <br />'• • -tom <br />JA. <br />UAK ,I <br />r, 1.. <br />•A,- ; j ":J ?jl ..?lul' 11 <br />xt..? { ?,??? <br />At / <br />OLw <br />?? ???- • t }? .Al.?t lyr. , .`:i?, F'k•r?l. JJII HY f ;(? ?!t ?91? ill/ A j ,j a„ t ,,,! <br />.( 111, t ?? '? ?'i,i. J?:t;w`T, V?J ?.? -•v.!lft? <br />FIGURE 4.33 LEVEL SPREADERS <br />(Modified from Commonwealth of Virginia, 1990) <br /> <br />When and Where to Use Them <br />Level spreaders are most often used as an outlet for temporary or permanent storm water <br />conveyances or dikes. Runoff that contains high sediment loads should be treated in a sediment <br />trapping device prior to release into a level spreader. <br />4-105