Civil · C-DE2AF

Check Dam Spacing

Materials

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Proper spacing and cross-sectional geometry for rock check dams in drainage ditches and channels. The maximum spacing length between dams is determined so that the toe of the upstream dam sits level with the top of the downstream dam. Rock sizing consists of two-to-four-inch stone completely covering the bottom and sides of the ditch at two-to-one slopes, maintaining a twenty-four-inch channel depth with a six-inch sediment accumulation tolerance. Additional criteria specify provisions for sumps immediately upstream, regular sediment removal, and erosion protection via rip-rap or erosion control blankets where scouring occurs.

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