subdrainage

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.

这样既可确地反映出河道附近格网的水流方，又可让各个子流域内的汇流方和水流方不会跨越子流域的分水岭。

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.

岩斜坡和岩洼地为地表水汇集区及地下水排泄区，岩相对弱，储层不发育。