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Common methodological approach for optimal management operations_D3.7

Date: 1 December 2011

Flood management approaches and sedimentation problems vary widely from site to site. Due to the complexity of flood and sedimentation processes governed mainly by hydrologic, geologic, topographic and geographic characteristics, neither an all-embracing description of the problem nor an analytical approach exits to predict or accurately manage sedimentation. The most promising way to face the occurring problems is to study specific sites with their conditions and best practice examples.

Reservoirs are built for different purposes. The intended purposes of reservoirs are listed below, multiple functions being the general rule, especially for large dams, as these are:

Flood protection;

Irrigation (agriculture);

Drinking water supply;

Electric power production including pumped-storage operations;

Water level increase during low flow periods (navigation, cooling water);

Groundwater enrichment;

Sedimentation basins (suspended particles, bedload silts);

Stabilisation of the stream or river bed (gradient reduction);

Leisure and recreation.

Reservoirs are intended to store the inflow for a certain period – on a daily, monthly, seasonal or year-to-year basis – to bring about a temporal and quantitative balance between water yield and water requirements as well as to control the flow regime. Resort is made to the stored water during periods of insufficient flow for the purposes of electricity generation, drinking water supply or supply to waterways. Retention of flood flows through storage may prevent inundations, and disastrous droughts may be avoid, or at least mitigated, through irrigation.

» SEE_Hydropower_WP3_D3.7_TUG_111117.pdf