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1 Evangelista, D. L.; Torres, R. D.; Faigmane, M. M. 1975. The economics of groundwater irrigation. In International Rice Research Institute. Water management in Philippine irrigation systems: research and operations. Los Banos, Laguna, Philippines: International Rice Research Institute (IRRI). pp.195-206.
(Location: IWMI-HQ Call no: 631.7.6 G732 INT Record No: H018)
A survey of 52 small-scale pumping units in Quezon and Batangas provinces in 1971-72 reveals that pump irrigated rice farms had positive net returns, with the wet season returns slightly greater than those of the dry season. But pump systems in the study areas performed poorly. They had low pump discharge rates and served limited areas. Four inch pumps had a greater average pump discharge than 5-inch pumps operating even at lower revolutions per minute. No substantial differences were found in yields of farms irrigated from different water table depths, or of different soil types. There were significant differences in pump discharge among soil types although they were not significant with respect to depth of water table. It was also found that area served was more dependent on available irrigable land than on soil type or water table depth. The study revealed that water is often conveyed through poorly maintained earth canals which we believe considerably reduced the efficiency of water use. The most common method of irrigation fee payment is 20 percent of net product shared by the tenant and landlord in both the wet and dry seasons. The major problem of pump owners is the lack of cash for pump repairs.
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