Low water level
low water level|Low water level
In Hydrology, the low water level corresponds to the period of the year when the flow of a River reaches its point low. This value is annual. It intervenes for one period of Tarissement and is due to a strong and prolonged dryness which can be strongly aggravéee by high temperatures supporting evaporation, and by agricultural pumpings at end of Irrigation.
At the time of the low water level, the Polluant S possibly rejected in river are concentrated.
Le risk of lack of Oxygène the night is highest (Eutrophisation, Dystrophisation).
C' is also the critical moment where the Nuclear plants cooled by water are likely to miss some and the period when they heat more the river (thermal pollution).
Other applications: the low water level also indicates the level low reached by a Lac or a downward Marée.
- Notation: on the curve of the classified flows, inter alia, this flow is noted DCE (Flow Characteristic of Low water level) or DC355 (This flow is exceeded 355 days per annum).
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