A tidal barrage is an artificial obstruction at the mouth of a tidal watercourse, in contrast to a normal barrage along a river's inland course.
Purpose The common primary functions of a barrage are:
Increase the depth of a river (similar to a weir) Maintain a separation between fresh and salt water Reduce the risk of tidal flooding up the river
Secondary functions may include:
Tidal power generation Artificial whitewater leisure centres Form a coastal reservoir
Notable barrages
Image Location Waterway Description Notes Cardiff Bay Cardiff, Wales Cardiff Bay long Rockhampton, Queensland, Australia Fitzroy River Used for water supply and irrigation; incorporates a fish ladder Goolwa Coorong, South Australia River Murray A series of five barrages Marina Singapore Marina Channel Formed at the confluence of five rivers: long Prakasam Andhra Pradesh, India Krishna River long; connects the Vijayawada and Guntur districts Swansea Swansea, Wales River Tawe Incorporates a pumped-storage hydroelectric power station, powered by tidal power Tees England, UK River Tees Comprises a river barrage, road bridge, footbridge, barge lock, fish pass and access point to a white water course West Sea Namp'o, North Korea An system of dams, three lock chambers, and 36 sluices
Power station barrages Rance Tidal Power Station Annapolis Royal Generating Station (decommissioned) Sihwa Lake Tidal Power Station Kislaya Guba Tidal Power Station Jiangxia Tidal Power Station
Proposed barrages Severn Barrage across the River Severn between Wales and England Mersey Barrage across the Mersey Estuary in England
See also
List of tidal power stations Floodgate Thames Barrier
References