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Construction sites of more than one acre are required to install systems to retain sediment produced onsite. This factsheet describes several chemical treatment options, including polyacrylamides (PAM), gypsum and alum, for reducing turbidity in impounded water.
Sediment basins are temporary stormwater pools that catch runoff so it can deposit some of its sediment. The typical outlet is either a rock dam or a perforated riser barrel, both of which allow water to leave the basin from all depths. One way to improve the sediment capture rate is to use an outlet that dewaters the basin from the top of the water column where the water is cleanest. This publication describes the Faircloth skimmer, flashboard risers and other outlet configurations that accomplish this goal.
