同时，水平梯田的质量对其减水减沙效益影响很大。
Meanwhile the quality of level terrace effects its soil and water conservation benefit greatly.
各地可直接利用该曲线，查出水平梯田减水减沙效益值。
Each place can find out the benefit value of water and sediment reduction of terraces by using the curve.
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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