Drainage and irrigation machinery is usually used for farmland irrigation and drainage pumps, which drive the power machine, the water can be pumped from low to high or remote, so the pump is also commonly known as the pump. A wide range of pumps, uses a wide range of applications in all areas of the national economy. In agriculture, the pump is mainly used for irrigation and drainage of farmland, irrigation in case of drought, water drainage in case of waterlogging, improvement of ability to defeat floods and droughts, ensuring high yield of crops and stable production, and promoting agricultural and sideline production. Common types of agricultural pumps are centrifugal pumps, axial flow pump, mixed flow pump, well pump, submersible pump, water pump and so on. In agricultural production, should be based on the requirements of different regions of production conditions, the use of different performance of irrigation and drainage machinery. In plain areas, such as the Pearl River Delta in our province, river networks have abundant water, vast fields, autumn and winter droughts, rainy summers, and frequent heavy rains, heavy rains and farmland waterlogging, requiring rapid drainage. Due to the low lying area and low lifting lift in these areas, the water input for farmland irrigation or drainage is rather large. Axial flow pumps with "low lift and large flow" performance should be adopted. In the northern mountainous area of ​​Guangdong, due to the small plots, the lift lift higher, while the flow is not big, should use the performance characteristics of "high lift, low flow" centrifugal pump. In view of the acute mountainous steep currents in some mountainous regions and abundant water resources, it is expected to promote the use of hydro-energy water pump to solve the problem of irrigating in high places and sites. In the hilly area near Guangzhou, the hill is not high, the block is not large, suitable for the performance of the pump, the flow rate is smaller than the axial flow pump, but also larger than the centrifugal pump flow; head smaller than the centrifugal pump, and Than the axial pump high flow pump. In northern areas, deep ground pumps, shallow shaft pumps, submersible pumps and the like are widely used due to the limited surface water and the need to develop groundwater to irrigate farmland. Therefore, we must choose the appropriate local irrigation and drainage machinery.
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