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一、过滤器长度确定过滤器的最佳长度与含水层的厚度、合理的最大抽降、含水层的层次有关。对于均质承压含水层,过滤器长度应相当于含水层厚度的70～80%,即当含水层厚度小于25英尺(约7.5米)时为70%,25～50英尺时为75%,大于50英尺时为80%。过滤器与井壁管相间排列能增加井的单位出水量。总之,在承压含水层中,井的过滤器长度应符合这一准则:井的单位出水量应达到
First, the length of the filter to determine the optimal length of the filter and the thickness of the aquifer, a reasonable maximum pumping, aquifer level. For homogeneous confined aquifers, the filter length should correspond to 70-80% of the aquifer thickness, ie 70% for aquifers less than 25 ft (about 7.5 m) and 75% for 25-50 ft 80% over 50 feet. The arrangement of the filter and the wall tube increases the well water output per unit. In summary, the length of the filter in a confined aquifer should conform to this criterion: the well water output per unit shall be