水文法和水保法是分析计算流域治理减水减沙效益常用的两种方法，但都存在一些问题。
Hydrologic method and soil conservation method are two usual methods for calculating sediment and runoff reduction benefit brought by watershed management, but both have some problems.
水文法和水保法是分析计算流域治理减水减沙效益常用的两种方法，但都存在一些问题。
Hydrologic method and soil conservation method are two usual methods for calculating sediment and runoff reduction benefit brought by watershed management, but both have some problems.
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