drainage radius
... drainage pattern 水系型 drainage radius 排水半径 drainage ratio 迳潦 ...
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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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