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坝地土肥水足,适宜于发展高产优质高效农业。晋西水土流失严重的汾西县打坝淤地历史悠久,经过多年配套建设,目前共有坝地3344hm~2,农业人均0.03hm~2。统计资料表明:坝地仅占全县耕地面积的9.26％～10.04％,而粮食产量却占总产量的27.2％～51.7％;坝地平均每公顷淤积泥沙26595m~3,全县坝地共拦泥8527万m~3,折合11511万t,相当于治理前年均向黄河输沙量593.6万t的19倍。坝地防洪保收在很大程度上取决于降雨的时间分布及雨量大小,其允许淹水深度依坝地作物株高而定。经典型小流域分析,汾西坝地具有较高防洪保收能力。其主要经验是,合理布设坝系工程,修建坝地排洪渠和加强管护。
Dabu soil fertilizer enough to develop high-yielding high-quality and efficient agriculture. There is a long history of damming silting in Fenxi County, which has serious soil erosion and soil erosion in western Shanxi Province. After many years of construction, there are a total of 3344 hm2 of dams and 0.03 hm2 of agriculture per capita. Statistics show that: the dam area accounts for only 9.26% ~ 10.04% of the county’s cultivated land area, while the grain output accounts for 27.2% ~ 51.7% of the total output; the average silt sediment per hectare in the dam area is 26595m ~ 3. 85270000 m ~ 3, equivalent to 115110000 t, equivalent to 19 times the previous year to the Yellow River sediment transport capacity of 5.936 million tons. Dam flood control depends largely on the time distribution of rainfall and the size of the rainfall, which allows the depth of flooding according to dam height plant may be. Analysis of a classic small watershed, Fenxi dam has a high capacity of flood control. Its main experience is to rationally deploy dam systems, construct flood discharge channels in dams and intensify management and protection.