被误解了的“裘布依稳定井流模型”（“影响半径模型”）是不合理选择地下水开采层位的主要“理论”依据。
The misunderstood "Dupuit stable well flow model" ("model of radius of influence") is the main "theoretical" basis of the unreasonable selection of exploited horizon of groundwater.
但是当水文地质条件复杂，不能引用影响半径时，就不符合裘布依井流公式的适用条件，也就不能再用大井法计算排水量；
The generalized large well method is not applicable when the influence radius doesn't exit and the complicated hydrogeological condition is not fit to the condition of Dupuit well-flow formula.
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