Planned water use is of important practical significance for improving the economic benefit of the irrigation area, meeting the water demand of crops and reducing the investment of water users. There is no waste of water and the engineering management and operation cost can be saved, thus maximizing the two-way benefit.%计划用水对于提高灌区经济效益具有重要的现实意义，既满足农作物的需水需求，又降低用水户的投入，既不浪费水资源，又节省工程管理费用和运行费用，使双向效益最大化。
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