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我国是一个水资源严重短缺的国家,水资源总量约为2.8万亿m3,人均水资源占有量为世界人均占有量的1/4,耕地单位面积水资源占有量不足世界平均水平的1/2。据统计,2008年我国农业总用水量为3664亿m3,约占农业用水总量的90%;同时,我国农业灌溉仍然存在灌溉效率低下和用水浪费的现象,我国渠系水利用系数均为0.51左右,也就是说有49%的灌溉水在输水过程中损失掉了。渠道衬砌与防渗技术是我国
China is a country with a serious shortage of water resources. The total amount of water resources is about 2.8 trillion m3, the per capita water resources occupy 1/4 of the world average, and the amount of water resources per unit of cultivated land area is less than 1 / 2. According to statistics, in 2008, China’s total agricultural water consumption was 366.4 billion m3, accounting for about 90% of the total agricultural water consumption; meanwhile, irrigation inefficiency and waste of water still existed in agricultural irrigation in our country, and the coefficient of water use efficiency in China’s canal system was 0.51 That is to say, 49% of the irrigation water is lost during the water conveyance. Channel lining and seepage control technology is our country