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(三)动力机和水泵的搭配需要什么型号的抽水机和搭配多大功率的动力机,都要事先设计好。灌溉和排涝要求不同,设计计算方法也不相同,现举例说明于下:1.灌溉所需马力的计算方法:计算时首先要决定需要的流量,它和灌溉面积,农田耗水量,抽水机每日的允许工作时间,及渠道系统的渗漏情况有关。灌溉面积都用市亩作单位,每一市亩等于667平方米,有些地方用“习惯亩”作单位,在计算马力时应把它们折合成平方米。农田耗水量,是指农田一天要耗用多少水,这
(C) power machine and pump with what type of pump and power machine with more power, must be designed in advance. Irrigation and drainage requirements are different, the design and calculation methods are not the same, the following is an example: 1 irrigation horsepower calculation method: the calculation must first determine the required flow, and irrigated area, farmland water consumption, water pump daily The allowable working hours and the leakage of the channel system. Irrigation area with city acres for the unit, each city is equal to 667 square meters of mu, in some places “habitat acres” for the unit, in calculating horsepower should be converted into square meters. Water consumption in farmland refers to how much water the farmland consumes in a day