The invention relates to a new technique theory of 'storing runoff split irrigation', that is, irrigated areas and field irrigation are two different units which are not synchronous, relatively independent, incontinuous and work respectively, more particularly, the irrigation water required by crops is rated through an irrigation water supply network and delivered to a rated split type storing runoff douche at the crop water consumption place of fields for once, channel or piped water supply can finish the task relatively and independently in a short time, while the time consumption of crop irrigation is an automatically released process that is unrelated to water supply and relatively independent in fields, thus changing the traditional continuous and synchronous irrigation mode of 'water supply, water need, irrigation and completion' in the process of water supply and irrigation of China;

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