Meanwhile the quality of level terrace effects its soil and water conservation benefit greatly.

同时，水平梯田的质量对其减水减沙效益影响很大。

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Aim to analyze the investment and benefit of the water and soil conservation treatment to provide reference in national economy evaluation for the feasibility of small water-soil conservation project.

目的分析小流域的水土保持综合治理费用与效益，为小流域水土保持项目国民经济可行性评价提供借鉴。

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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。

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