This method can acurately simulate the flow direction in gird near river, and can keep the direction of waterflow from crossing the watershed of subdrainage area.

这以较精确地反映出河道附近格网的水方向，又以让各个子域内的汇方向水方向不会跨越子域的分水岭。

The karst depression belongs to the accumulative area of surface water and subdrainage area of subsurface water, the karstification is relatively week, and reservoirs are undeveloped.

溶斜溶洼地为地表水汇集区及地下水排泄区，溶作用相对较弱，储层不发育。