Abstract:Numerous impermeable underground structures exist in urban seepage field. Since the corner of the structure is singular point and the dimension of the structure is negligibly small compared with the whole urban seepage field,it is difficult to model seepage field in urban area with existing methods. Invoking the theories of complex potential,dipole,flow around cylinder,etc.,one method called node partition method is created here to model urban seepage field. Nodes are subdivided and flow rate is defined on given nodes in this method,then the same water check effect as underground structure is formed. The proposed method is first applied to seepage flow around a single underground structure. Iterative method for seepage flow is then tested. Based on these theories,a computer program based on finite element method is validated.