The target of the reservoir is the water level above a reservoir (for example weir , dam , sluice or river power station ), which is generally permissible for normal operating conditions according to its intended purpose. The term “storage target” is standardized in DIN 4048 (hydraulic engineering terms). It is usually given in meters above the relevant reference altitude , in Germany in meters above sea level (m above sea level).
Height of the congestion destination
The destination of the dam does not only depend on the technical characteristics of the dam, but rather on its intended purpose. A pure drinking water reservoir has the highest possible storage target. In the case of a dam that also serves as a flood retention basin , on the other hand, a larger part of the storage space must be kept free as a flood retention area, so that the storage target is significantly lower than the top of the flood relief system . It is then regulated by regulating devices (for example the bottom outlet ) and is the upper limit of the operating space .
The highest flood target corresponds to the height of the upper edge of the flood relief (full flood), over which an extreme flood can drain. The term “ highest water level ” is therefore independent of whether such a high water level is ever reached.
Regulation in the river backwater
In a river dam chain, for example at locks, the dam destination is often regulated automatically so that the river can be used as a waterway between the dam systems for shipping.
Related terms are: maximum congestion , lowering target , lowest lowering target. In the case of the highest storage target, a further distinction is made between the highest storage target ZH1 at 1000-year floods and ZH2 at 10,000-year floods.
The water level is measured with a level (see graphic explanation of water level there).
- Explanation of terms on talsperren.net
- Glanzmann, Siebenthal: Automatic damming target and flow regulation of a river damming chain