An artificial whitewater course (AWWC) is a site for whitewater canoeing, whitewater kayaking, whitewater racing, whitewater rafting, playboating and slalom canoeing with artificially generated rapids. Course types Main types of course: Flow diversion These work by diverting a natural river through boulder placement or damming, or by creating new channels next to an existing river, possibly by a weir or power station outflow. Tidal action Created in estuaries with large tidal reaches, on a barrage across the river. The barrage is opened during a rising high tide to allow the sea water in, then shut as the tide turns. The water stored above the barrage is then forced through an artificial channel to provide water features. Pumped The nature of artificial whitewater courses necessitates the need for a drop in the river, and enough water flow to provide hydraulics. When this isn't possible (often in flat low-lying areas), electric pumps are used to lift and re-circulate the water to the top of the course. The shapes of these courses are commonly circular or U-shaped. Pumped courses are extremely expensive to run, typically 1-2 megawatts of electrical power are needed to pump 15 cubic metres per second of water down a course with a 5-meter drop in height. Altered Riverbed These courses are created in existing natural river channels, but are enhanced with strategic placement of new rocks, boulders, or concrete structures. Some are downstream of river or channel wide dams and therefore have some level of flow optimization, others are subject to seasonal flows. Olympic whitewater courses 1972 - Augsburg Eiskanal in Augsburg, Germany — flow diversion 1992 - Segre Olympic Park in La Seu d'Urgell, Spain — flow diversion/pumped 1996 - Ocoee Whitewater Center near Copperhill, Tennessee, USA — altered riverbed 2000 - Penrith Whitewater Stadium, near Sydney, Australia — pumped 2004 - Hellinikon Olympic Canoe/Kayak Slalom Centre, Athens, Greece — pumped 2008 - Shunyi Olympic Rowing-Canoeing Park, Beijing, China — pumped 2012 - Lee Valley White Water Centre, London, England — pumped 2016 - Deodoro Olympic Whitewater Stadium, Rio de Janeiro, Brazil — pumped 2021 - Kasai Canoe Slalom Centre, Tokyo, Japan — pumped Other notable courses Adventure Sports Center International in McHenry, Maryland, USA — pumped Canolfan Tryweryn near Bala, Gwynedd, North Wales — natural flow modifications Cardington Artificial Slalom Course near Bedford, England — flow diversion Dickerson Whitewater Course in Dickerson, Maryland, USA — pumped Dutch