dam
a large structure built across a river or waterway walls made of concrete, earth, or rock a large body of water behind the structure sluice gates to regulate water flow a spillway to release excess water a power plant or other building on the bank of the river
dam which is a large structure built across a river or waterway dam which has walls made of concrete, earth, or rock dam which is a large body of water behind the structure dam which has sluice gates to regulate water flow dam which is a spillway to release excess water dam which is a power plant or other building on the bank of the river