| 摘要 |
A reservoir is provided with a flexible, floating, cover secured to the sides of the reservoir along a line located between the anticipated upper and lower levels which water or other liquid in the reservoir may assume whereby the cover will remain in contact with the surface of the liquid as its level fluctuates up and down. A drain extending through the wall of the reservoir is arranged to draw off any rain or melted snow accumulating on the upper surface of the cover.
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