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灌溉经济效益计算的目的与原则在库容已定的情况下,灌溉经济效益计算的目的,主要是合理地选择灌溉供水保证率与灌溉面积。保证率愈高,灌溉面积愈小,反之则面积愈大。保证率选得过高或过低,一般都是不经济的,必须通过经济效益论证,才能合理地选定。灌溉效益计算的原则为: 1.全面反映因灌溉而增加的效益,即除粮食增产外,还应包括渠道航运、跌水发电、生活及工业供水等。另外,农业增产是水利和农业措施的综合效益,必须合理地分摊。
The purpose and principle of calculation of economic benefits of irrigation The objective of calculation of economic benefits of irrigation in the case of a given storage capacity is to rationally select the guaranteed rate of water supply and irrigated area. The higher the guarantee rate, the smaller the irrigation area, otherwise the larger the area. If the guarantee rate is too high or too low, it is generally uneconomical. It must be justified through the demonstration of economic benefits. The principles for calculating irrigation benefits are as follows: 1. To fully reflect the increased benefits due to irrigation, that is, in addition to food production increase, it should also include channel shipping, water drop generation, living and industrial water supply. In addition, increasing agricultural output is a comprehensive benefit of water conservancy and agricultural measures and must be properly shared.