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灌溉工程的经济效益是指灌溉和未灌溉相比所增加的农、林、牧业产品(包括主、付产品)的产量或产值。对于农业来说,它由农作物的保收与增产来体现。但是,农业的增产常常是灌溉工程设施和农业技术措施等有关因素综合作用的结果,而不是灌溉工程的独家功劳。因此,在进行灌溉工程的效益分析时,盲目地将农业增产量全部作为灌溉工程的效益是不妥当的,应该进行合理分摊,方能如实反映灌溉工程的经济效益。如何进行分摊,这里涉及到一个分摊系数问题。《水利经济计算规范SD139-85(试行)》〔下称规范〕中指出:“灌溉效益的分摊系数一般为0.2～0.6,平均约0.4左右,丰、
The economic benefits of irrigation projects refer to the output or output value of agricultural, forestry and animal husbandry products (including primary and secondary products) increased as compared to irrigated and irrigated crops. For agriculture, it is reflected in crop yields and yields. However, the increase in agriculture is often the result of a combination of such factors as irrigation engineering facilities and agricultural technology measures, rather than the sole merit of irrigation projects. Therefore, when analyzing the benefit of irrigation projects, it is inappropriate to blindly regard the increase of agricultural output as the benefit of irrigation projects. Therefore, it is reasonable to apportion the benefits so as to reflect the economic benefits of irrigation projects. How to share, here involves a problem of sharing factor. “Water economy calculation code SD139-85 (Trial)” [hereinafter referred to as the norms] pointed out: "The irrigation efficiency of the sharing coefficient is generally 0.2 to 0.6, an average of about 0.4, Feng,