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Waterbar

A water bar or interceptor dyke is a road construction feature that is used to prevent erosion on sloping roads, cleared paths through woodland (for utility companies such as electricity pylons), or other accessways by reducing flow length. It is a diagonal channel across the road that diverts surface water (that would otherwise flow down the whol...
Found on http://en.wikipedia.org/wiki/Waterbar

Waterbar

A drainage structure (for turning water) composed of an outsloped segment of tread leading to a barrier placed at a 45¬° angle to the trail; usually made of logs, stones, or rubber belting material. Water flowing down the trail will be diverted by the outslope or, as a last resort, by the barrier. Grade dips are preferred on multi-use trails instea...
Found on http://www.americantrails.org/

Waterbar

Drainage feature, usually stone, built across the path; diverts path surface water to the lower side slope.
Found on http://www.encyclo.co.uk/local/20717
No exact match found.