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(一)弯管测定动水位的经验我們在实际工作中,經常遇到,由于滤水管或滤水管上面的壁管口徑小,而井內涌水量很大,要求下較大口徑的吸水管。例如,在外徑178公厘的滤水管中,要求下4吋臥式离心水泵,外徑108公厘的吸水管,做抽水试验。两管之间距海边不到4公厘。而我們現在一般测定动水位,都在吸水管与濾水管之間观察水位。但在这狹小的孔隙內观察动水位,經驗証明,是非常困难的,或者根本观察不到水位,过去解决这个
(I) Experience in the determination of dynamic water level in curved pipes We often encounter problems in practical work. Since the diameter of the wall pipe above the filter pipe or the filter pipe is small and the amount of water in the well is large, a larger diameter suction pipe is required. For example, in a water filter tube with an outer diameter of 178 mm, a horizontal water pump with a horizontal diameter of 10 mm and a suction pump with a horizontal diameter of 4 mm is required for the pumping test. Between the two tubes is less than 4 mm from the sea. And we generally measure the dynamic water level, and observe the water level between the suction pipe and the filter pipe. But to observe the dynamic level in this narrow hole, experience shows that it is very difficult, or the water level is not observed at all.