Slope lengths in OF practice have typically ranged from 100 to 200 ft (30 to 60 m). The longer the slope has been, the greater has been the removal of BOD, TSS, and nitrogen. The recommended slope length depends on the method of application. For gated pipe or spray heads that apply wastewater at the top of the slope, a slope length of 120 to 150 ft (36 to 45 m) is recommended. For sprinkler application, the slope length should be between 150 and 200 ft (45 to 61 m). The minimum slope length for sprinkler application (usually positioned one third the distance down the slope) should be the wetted diameter of the sprinkler plus about 65 to 70 ft (20 to 21 m).
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