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水稻是淠史杭灌区的主要灌溉作物。本文根据灌溉效益分摊系数法,选择不同降雨年型的降雨量,得出水稻生长期间降雨量与灌溉效益分摊系数的相关公式。对灌区运行55年的水稻灌溉效益和经济效益进行分析,计算出55年以来的灌溉面积达到0.27亿hm2,历年5~8月渠首灌溉引水量为1394.76亿m3,水稻灌溉增产量482.5亿kg,按当年的实际价格计算,经济效益为511.4亿元。
Rice is the main irrigated crop in Pishihang irrigation area. According to the irrigation benefit distribution coefficient method, this paper chooses the rainfall of different rainfall years to get the correlation formula of rainfall and irrigation benefit coefficient during rice growth. The irrigation benefit and economic benefit of 55-year irrigation runoff in irrigation area were analyzed. The calculated area of irrigation reached 55 million hectares since 55 years. From May to August, the water diversion irrigation volume reached 134.976 billion m3 and the output of rice irrigation increased by 48.25 billion kg , According to the actual price of the year, the economic benefit was 51.14 billion yuan.