根据区域水量平衡原理，从灌溉水的损失途径分析，提高灌溉水利用率有工程措施、管理措施和技术措施。
In accordance with regional water volume balance theory, there are structural, management and technical measures to improve efficiency of irrigation water by analyzing how irrigation water losses.
从土壤水分平衡原理出发，以降水量、温度和区域水文观测等因子为基础，建立了土壤干旱指数模型。
Based on the principle of soil water balance, including precipitation, temperature and other observations, this article built a model of soil drought index.
它以地下水渗流理论为基础，从整个计算区域的水量平衡或质量守恒出发，建立反映整个计算区域地下水运动状况的数学模型。
It based on groundwater percolation theory and water balance or quality conservation builds mathematical model which can reflect the whole regional groundwater movement.
它以地下水渗流理论为基础，从整个计算区域的水量平衡或质量守恒出发，建立反映整个计算区域地下水运动状况的数学模型。
It based on groundwater percolation theory and water balance or quality conservation builds mathematical model which can reflect the whole regional groundwater movement.
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