System design of water flow is divided into 2 methods i.e. CRREL Method is U.S.Army Cold Regions Research and Engineering Laboratory (CRREL) considered on the basis of hydraulic retention time on the slope, while the other way. Is the way UCD Method is University, of CaliforniaDavis (UCD), by considering the length, area, slope and flow rate of water upon the treated area (US. EPA, 1981).
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