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将宽阔的溃口洪水行进范围概化成由河道水塘和联系河道组成的网河系统，用一维非恒定流方程组来描述主要的水流运动状态。通过简化和变换，改写成统一的四点线性隐式有限差的方程组形式，再用双消除法求解，全部计算在微机上实现，参数用实测资料率定。成果具有较好的精度，在一定程度上反映出横水流方向的水位流量变化，为防洪水利计算开辟一条新的途径。
The wide range of run-off floods is generalized into a network of river systems consisting of channel reservoirs and associated channels, and one-dimensional unsteady flow equations are used to describe the main flow regimes. Through the simplification and transformation, rewritten into a unified four-point linear implicit finite difference equations, and then double elimination method, all calculated on the computer to achieve, the parameters measured with the data set. The results have good accuracy, to a certain extent, reflect the change of water level and flow in the direction of transverse flow, which opens up a new way for flood control and water conservancy calculation.