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未控区“水保法”减洪减沙效益计算是一项新的研究任务。黄河中游河口镇至龙门区间（简称河龙区间）晋西北片未控区面积７５７７ｋｍ２，占该片总面积的２９．５％。通过区块划分，建立水保措施密度分布等值线图，在相邻已控区研究成果的基础上，进行了未控区水保措施减洪减沙效益计算。结果表明：晋西北片未控区六十年代、七十年代、八十年代水保措施年均减洪量分别为４０４万ｍ３、１２８９万ｍ３和７８７万ｍ３，减洪效益依次为１．７％、７．６％和７．７％；水保措施年均减沙量分别为１７６．４万ｔ、６１１．４万ｔ和４４９．８万ｔ，减沙效益依次为１．５％、１０．５％和１５．０％。利用已控区的资料计算未控区减洪减沙效益，还需在实践中进一步完善。
Uncontrolled area “Water Conservation Law” calculation of efficiency of floods and sediment reduction is a new research task. In the middle reaches of the Yellow River, the area of the uncontrolled area in northwestern Shanxi is 7577km 2, accounting for 29.5% of the total area of the tablet. Through the block division, the contour map of water and soil conservation measures was established. Based on the research results of adjacent controlled areas, the benefit of flood control and sediment reduction in non-controlled areas was calculated. The results show that the annual flood control measures in the non-controlled areas in the northwestern part of Shanxi Province in the 1960s, 1970s and 1980s were 4.04 million m3, 12.889 million m3 and 7.87 million m3 respectively, and the flood reduction benefits were 1.7% , 7.6% and 7.7% respectively. The average annual sediment reduction for soil and water conservation measures was 1.764 million tons, 6.114 million tons and 4.498 million tons respectively, and the sediment reduction benefits were 1.5% and 10% respectively .5% and 15.0%. Using the information of controlled areas to calculate the benefit of flood control and sediment reduction in uncontrolled areas, we must further improve in practice.