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引言兴建灌溉工程的主要目的是使农业生产不受或少受不良气候条件的影响,以获得高产稳产,从而达到最大限度地满足社会的物质需要。对于一个具体的灌溉工程来说,到底应对社会需要满足到何种程度,这需要有一个量(即经济效果)概念来衡量。每一项经济活动,都要投入和耗费一定的社会劳动,同时也会生产出一定的有用成果或创造出一定的社会效益,因而都可以把投入和产出、消耗和成果、费用和效益加以比较,来考察它们的经济效果。同样,灌溉工程也可用这两个因素的比较来反映经济效果。如果用数学公式表示,则有如下两种形式:
Introduction The main purpose of the construction of irrigation works is to ensure that agricultural production is unaffected by or adversely affected by adverse climatic conditions in order to achieve high and stable yield and achieve the maximum material needs of the community. For a specific irrigation project, in the end to meet the social needs to what extent, which requires a measure of the amount (ie, economic effect) to measure. Every economic activity must invest and consume a certain amount of social labor, and at the same time it will produce some useful results or create some social benefits, thus making it possible to put input and output, consumption and achievement, costs and benefits into account Compare to examine their economic effects. Similarly, irrigation projects can also be used to compare the two factors to reflect the economic effect. If you use mathematical formulas, there are two forms as follows: