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Flows in open pump sumps are complex movements with free surface.
式水泵吸水池内流动是具有自由表面的复杂流动。
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Sumps use the weight of water and gravity to help soil's natural percolation.
污水坑使用水和重力的重量，以帮助土的自然渗透。
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Sumps use the weight of water and gravity to help soil's natural percolation.
污水坑使用水和重力的重量，以帮助土的自然渗透。
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