为了把地表径流安全地运送到大的排水系统,在水土保持实践中,排水沟被广泛采用.这些排水沟是作为分级渠道梯田或某种阶式梯田引水渠的出口.然而,即使是在使用中的或者是在仔细考虑中的,不是特殊的梯田系统,它们也会安全地排走地表径流.用草覆盖很好,宽的自然排水系统;一般来说这是既好又便宜的排水系统.因此,在设计水土保持系统中,要考虑利用自然的洼地以疏干排水.这种方法通常要有比较平缓的坡度和深厚的土层,其上要 In order to safely transport surface runoff to a large drainage system, drainage ditches are widely used in soil and water conservation practices, and these drainage ditches are used as outlets for terrace terraces or ladder terraces. However, even when used Or are carefully considered, are not special terraced systems, and they also safely drain surface runoff. Very well covered, grassy natural drainage systems are generally covered; this is generally a good and cheap drainage system Therefore, in the design of soil and water conservation systems, it is necessary to consider the use of natural depressions for drainage, which usually requires relatively gentle slopes and deep soil layers,