在大厚度含水层中设计管井时,合理确定滤水管长度,对于经济有效地开发利用地下水资源,有很大实际意义。本文提出了“滤水管实用长度”及确定管井‘滤水管实用长度”的“出水量增长率选择法”和“效益—成本分析法”,对指导生产井设计具有一定的实用价值。 When designing tube wells in large thick aquifers, it is of great practical significance to rationally determine the length of the drainage pipe for the economical and effective exploitation and utilization of groundwater resources. This paper puts forward “the selection method of growth rate of effluent quantity” and the “benefit-cost analysis method” of “practical length of drainage pipe” and “practical length of drainage pipe for pipe well”, which has certain practical value for guiding the design of production well.