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我省地处黄河中游,水土流失严重。据资料,直接流入黄河年输沙量在0.5亿吨以上,有十条支流(包括泾河),其中有八条流经我省。这些支流的流域面积占三门峡以上流域面积的19.5％,迳流量占22％,而输沙量占到50％以上。因此,在这些河流上修建水库,必须充分注意淤积问题。据调查,截止一九七三年底,我省一九七○年以前建成的120座百万方以上水库,由于泥沙淤积的库容,占总库容的53.3％。有43座被泥沙淤满。一九七一到一九七三年新建的72座百万方以上水库,已淤积损失库容8639万方,占总库容的11.1％。全省每年淤
The province is located in the middle reaches of the Yellow River, soil erosion is serious. According to statistics, the amount of sediment transported directly to the Yellow River reaches more than 50 million tons a year. There are ten tributaries (including Jing River), of which eight flow through the province. The watershed area of these tributaries accounts for 19.5% of the basin area above Sanmenxia, and the flow rate accounts for 22%, while the sediment discharge accounts for more than 50%. Therefore, to build reservoirs on these rivers, we must pay adequate attention to siltation problems. According to the survey, as of the end of 1973, 120 reservoirs of over one million square meters constructed in our province before 1970 accounted for 53.3% of the total storage capacity due to siltation of silt. 43 were covered with sediment. Over 72 new reservoirs of over one million square meters built in 1971 and 1973 have deposited 86.39 million cubic meters of coffers, accounting for 11.1% of the total storage capacity. The province every year silt