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我国北方,特别是黄河流域,干旱少雨,降水量又集中干汛期七、八月份,由于水土流失严重,造成大量泥沙汇集河道,使水库迅速淤积,库容大幅度减小,兴利效益降低。 一九七○年陕西省水科所对全省120座库容100×10~4m~3以上水库进行调查,总库容7.28×10~8m~3,淤积3.43×10~8m~3,淤积库容占总库容的47.2％。山西省水利勘测设计
In northern China, especially in the Yellow River basin, arid and rainy days, with precipitated rainfall concentrated in dry seasons In July and August, due to serious soil erosion, large amounts of sediment were collected and rivers were drained, resulting in rapid siltation of reservoirs and a drastic reduction in storage capacity and a decrease in the profitability of development. In 1970, Shaanxi Provincial Institute of Water Resources investigated 120 reservoirs with a capacity of 100 × 10 ~ 4m ~ 3 in the province, with a total storage capacity of 7.28 × 10 ~ 8m ~ 3 and a siltation of 3.43 × 10 ~ 8m ~ 3. 47.2% of the total storage capacity. Shanxi Water Conservancy Survey and Design