The water flow velocity in the suctionpipe, which is crucial for evaluating the performance on pumping fish, can be measured by the pumped water flow rate of the riser in an air lift pump system.
气力提升泵的水输送量反映了提升管进口的流速情况，而进口流速是衡量吸鱼效果的重要因素。
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B. water-filled pump start before the pump casing and suctionpipe must be full of water that is because of the presence of air vacuum pumping the population can not be formed and maintained.
This paper introduces the structure and hydraulic design of the multiphase flow centrifugal pump, which draught sands from the riverbed and discharge the air of the suctionpipe.