Erosion and Sediment Control Tip #56
“On The Contour”
Perry L
Oakes, PE
Erosion and Sediment
Control Program Coordinator
AL Soil and Water
Conservation Committee
Today’s Erosion and Sediment Control Tip: #16
Today’s Erosion and Sediment Control Tip Sediment Basins require a device to dewater from the surface of the basin to remove the cleanest (less turbid) water. This is often accomplished with a skimming device that is designed to remove the stored construction runoff over a period of 2 to 5 days. It is important that the skimmer be installed and maintained properly. Skimmers must have a flexible connection to the rigid pipe or riser system that goes through the dam. It should easily operate at all design elevations. When placed on a principal spillway riser, the pipe from the skimmer to the flexible connection should be about 1.5 x the height of the riser structure. The flexible pipe outlet at the rigid pipe or riser system through the dam should be at the standing pool elevation to ensure the skimmer does not function below the required elevation. A rock pad should be constructed for the skimming device to rest on when discharge is complete. The skim...
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