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Figure 6.1 A) Reservoire used for water supply (Hasznos, Hungary) and B) Dam on River Rába at Nick for irrigation water abstraction and partly hydropower generation

Irrigation reservoirs generally store water during wet seasons and release it during dry seasons. Release of water from hydropower reservoirs depends on electricity demand. Flows downstream of hydropower plants may fluctuate daily when increased water volumes are channelled through turbines during periods of high electricity demand (Figure 6.1b).  The effects of changes in the seasonal flow regime below dams and reservoirs and reduction in flow caused by water abstraction and diversion, upon lotic and riparian ecosystems have been demonstrated for rivers in a range of geographical regions.