Establishing the relation between canal density and canal-system water use efficiency can facilitate the evaluation of the influence canal distribution on canal-system water use efficiency.
渠道密度与渠系水利用系数两者之间关系式的确立，有助于从理论上评价渠道分布对渠系水利用系数的影响。
2
It not only solves the problem of frost heaving ofcanal but also declares the maintenance cost, improves the efficiencyof routing, and saves water resources.
既解决了工程抗冻胀问题，节省工程维修费用，又大大地提高了灌溉渠道输水效率，节约水资源。
3
Finally, the canalwaterefficiencyof all levels of canals, canal system waterefficiency and paddy field water consumptions of the 10 main irrigation areas in Shenyang city were put out.