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.

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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.

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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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