While irrigating hilly areas, it is often desirable to provide one or more booster pumps, taking off from a delivery chamber located at an intermediate point. It is highly uneconomical and wasteful of energy to lift water to a hill top and provide field channels and drop structures to irrigate the lower areas with delivery chamber located at the top of the hill. A contour map of a hill area will reveal that the total area between the higher contours is only a small fraction of the area lying between those representing the lower elevations. Hence, for hillside irrigation, intermediate delivery chambers are to be provided, which also serve as reservoirs for locating the inlet of the booster pump. In such a system, high-discharge medium or high head pumps are required to lift water from the intermediate delivery chamber, while one or more low-discharge high-head pumps are required to lift water from the intermediate delivery chamber to the top chamber. Such an arrangement will require a much smaller size prime mover for the pumping system, as well as a smaller diameter rising main between the intermediate and top delivery chambers.
In-line boosters having the downstream section of the rising main connected directly to the suction side of a volute centrifugal pump could also be used in river pumping schemes as per requirements.
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- 2. National Bank for Agriculture and Rural Development (1995). Lift Irrigation Schemes in Maharashtra-Techno-Economic Evaluation. Study No. 15, Department of Economic Analysis and Research, Mumbai, p. 129.
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