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四川省现有水库、渠堰及万亩以上泵站的干、支两级渠道,设计总长为18.7万公里,现已完成80％,其中已防渗的仅占已完成渠长的29.7％,大部分渠道尚未进行防渗处理。斗农渠未防渗的就更多了。灌区渠系水有效利用系数一般只有0.4～0.5,渠道输水损失很大,以致工程效益不能充分发挥。绵阳全花水库〔小(Ⅰ)型〕,将53公里干、支、斗渠全部用条石衬砌后,渠系水有效利用系数在原来基础上提高了50％,按该库近九年
The existing design of reservoirs, drainage weir and pump stations above mu in Sichuan has a total design capacity of 187,000 kilometers and has completed 80% of the total. Among them, only about 29.7% of the completed drainage ditches have been seeped through, Most of the channels have not been seepage control. Bucket farming seepage is more impervious. The effective utilization coefficient of canal system in irrigation area is generally only 0.4 ~ 0.5, and the loss of water transportation in the canal is very large, so that the project benefits can not be fully utilized. Mianyang Quanhua Reservoir 〔small (Ⅰ) type〕, 53 km of dry, branch, bucket drainage all with stone lining, the effective utilization coefficient of canal system increased by 50% on the basis of the original, according to the library for nearly nine years