An epilimnetic volume of nearly 350,000 m3 was separated by the installation of an overflown, submerged flexible curtain (SFC, 160 m long, 6 m deep) perpendicular to the flow direction in the Haselbach mouth region of the Saidenbach Reservoir (Saxony, Germany). The SFC produced (i) an interruption of hydraulic short circuits between inlet and main reservoir basin, (ii) a longer retention time of the inflowing water, and (iii) a 30% to 40% increase of the elimination of soluble reactive phosphorus in the mouth region during summer stratification. It is conclusive that flexible curtains may be cost-effective substitutes for conventional pre-dams of thermally stratified lakes or reservoirs.

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