Gardenista
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PO referred to the dam as a low-head dam. Never heard of it so I googled and found this:
LOW HEAD DAMS: WHAT ARE THEY? Low head or run-of-river dams, usually spanning the entire river or stream, present a safety hazard to the public because of their capability of producing dangerous recirculating currents, large hydraulic forces, and other hazardous conditions sufficient to trap and drown victims immediately downstream from the overflowing water.
http://www.safedam.com/low-head-dams.html
LOW HEAD DAMS: WHAT ARE THEY? Low head or run-of-river dams, usually spanning the entire river or stream, present a safety hazard to the public because of their capability of producing dangerous recirculating currents, large hydraulic forces, and other hazardous conditions sufficient to trap and drown victims immediately downstream from the overflowing water.
http://www.safedam.com/low-head-dams.html