![]() ![]() ApplicabilityĬheck dams may be used in ditches or channels to reduce erosion and trap sediment. Check dams are not a suitable substitute for major perimeter sediment trapping measures and can be easily washed away by high ditch/channel flows if they are not designed or installed properly.Ĭaution: To the extent feasible, erosion prevention practices such as stabilization are preferred to sediment control practices. The main function of a check dam is to decrease velocity, not to collect sediment, although sediment capture and increased infiltration is an added benefit. ![]() Under high-flow conditions, water flows over and/or through the structure. Under low-flow conditions, water ponds behind the structure and then slowly drains through, infiltrates, or evaporates. The disruption in flow direction and speed creates low velocity areas on the upgradient side of the check dam, causing deposition of heavier sediment particles and resulting in reduced scour potential (i.e., lateral and vertical erosion). Check dams help reduce ditch and channel velocities, prevent erosion, and trap small amounts of sediment by intercepting flow along a ditch or channel. 5.5 Erosion control blanket pillow checksĬheck dams are not intended as a replacement for proper ditch/channel stabilization (e.g., erosion blanket or turf mat over seed, use of rip-rap, etc.).
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