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黑龙江省青冈县青兰灌区,由于上游生态破坏,河床淤积,行洪断面减少,1988年以前,每年汛期渠首工程以上河堤,经常被洪水冲开,河水改道,明水期堵复确实困难,严重影响了灌区正常用水。针对这种情况,该灌区自1989年起连续几年冬季采用双道塑料薄膜防渗法堵截河道,取得了比较满意的效果。堵截竣工后,未碾压,土坝自然沉实,既使达到河水满槽的情况下,也没有出现渗漏和冲毁现象。从经济
In Qinglan Irrigation District, Qinggang County, Heilongjiang Province, due to the ecological damage in the upper reaches, siltation of the riverbed and reduction of flood discharge cross section, before 1988, flood control was frequently carried out in the headwaters of the flood season in each year. , Seriously affected the normal irrigation water use. In response to this situation, the irrigation district has been using double plastic film impermeability to intercept the river for several years in a row since 1989, and achieved satisfactory results. After the interception was completed, it was not rolled and the earth dam was naturally solidified. In the case of reaching the full tank of the river, no leakage or erosion occurred. From the economy