A bed sill, also called a ground sill or low weir, is a running across a river transverse to the direction of flow, built to reduce bed erosion. Common forms of construction include stone rockfill, rows of driven piles, timber and concrete sills.
Bed sills have the disadvantage that they cannot be passed by aquatic organisms. For this reason they are frequently rebuilt as: (gradient 1:20 to 1:30) (1:3 to 1:10).
Lenzi et al. (2003) state that the term "sill" applies to the lower structures (less than 1.5-2 m in height), and "check dam" is used for taller ones.
See also Weir Drop structure, a generic term for bed sill, check dam, weir, etc. Groyne, an underwater structure arranged at an angle to the riverbed
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