weir Synonyms

levee dike spillway sluice dam barrage barrier wall lock stank spout overfall moat sea wall pore penstock portcullis waterfall seawall blackweir waste-way water barrier sluice gate revolving door mill dam fish trap beaver dam aboideau floodgate lasher channel causeway canal burrock bund bulkhead buffer breakwater boom block barricade bar cofferdam conduit countervallation gate flume fence emunctory embankment