1 | A water power station must have a dam. | |
2 | The mouth of the river is and a freshwater lake created behind the . | |
3 | The mouth of the river is dammed and a freshwater lake created behind the dam. | |
4 | The barrage closure works of Qingtongxia Key Water Control Project on Yellow River in China. | |
5 | Returning to the river, a method of using their water which has been much discussed is the estuarine barrage . |