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1 Huelgas, R. R.; Torres, R. D. 1978. Preliminary analysis of selected gravity irrigation systems in the Philippines. In IRRI, Irrigation policy and management in Southeast Asia. Los Banos, Philippines: International Rice Research Institute. pp.151-164.
(Location: IWMI-HQ Call no: 631.7.8 G570 IRR Record No: J 67)
The economic performance in 1974 of seven diversion irrigation systems ranging in size from 2,400 to 9,000 has is compared with their performance as initially projected. Construction costs are generally about 15% higher than originally projected, operation and maintenance costs are about 55% higher, and farm income benefits from irrigation are about double. The greater farm income benefits stem from the much higher rice prices in 1974 than those that were projected. Area irrigated and yields were both substantially below projected levels.
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