What should the maximum spacing between check dams ensure about their elevations?

The maximum spacing between check dams should ensure that the top of the upstream dam is at the same elevation as the top of the downstream dam. This design principle is crucial because it helps maintain a consistent flow of water between the two structures. When check dams are used, they function to slow down the flow of water and promote sedimentation. By having the tops of these dams at the same elevation, it prevents excess water from overflowing over the upstream dam, which could lead to erosion problems and reduce the effectiveness of the check dams in controlling sediment.

Maintaining equal elevation at the tops of the check dams ensures a controlled and uniform water elevation behind each dam. This helps not only in stabilizing the sediment load being transported but also secures the structural integrity of both check dams. Proper spacing and elevation are essential for effective sediment control in stormwater management practices.