Your search found 6 records
(Location: IWMI-HQ Call no: PER Record No: H05598)
A procedure has been developed to increase irrigation efficiency by estimating probabilistic irrigation requirements for lowland rice cultivation. The procedure uses a water balance equation with random components to maintain minimum desired water levels in paddy fields at the end of each irrigation period. The procedure estimates weekly pan evaporation and rainfall at different probability levels, which are then used to estimate weekly irrigation requirements through the water balance relationship. The method has been applied to the Kalawewa irrigation scheme in Sri Lanka. Different statistical transformations were used to normalize observed weekly rainfall and evaporation data and to describe their variations. The power transformation was best able to transform the weekly data to normality. Comparison of the use of the model and current system practices shows that a significant amount of water can be saved even when the system is operated at high probability levels.
(Location: IWMI-HQ Call no: P 3869 Record No: H016833)
3 Alwis, J.; Nelson, L.; Gamage, H.; Nandasena, R. A.; Griffin, R. E.; Yoo, K.; Ekanayake, A.; Haider, M.; Wickramasinghe, L.; Dunn, L.; Bandaranaike, M. A. W.; Reddy, J. M.; Laitos, W. R. 1983. Diagnostic analysis of farm irrigation systems on the H-Area of Kalawewa in the Mahaweli Development Project, Sri Lanka. Draft report prepared in cooperation with the USAID (contract AID/DSAN-C-0058) x, 172p. (WMS report no.16)
(Location: IWMI-HQ Call no: P 5139 Record No: H024290)
(Location: IWMI-HQ Call no: P 5324 Record No: H024931)
(Location: IWMI-HQ Call no: P 7670 Record No: H039426)
6 Mendis, D. L. O. 2001. Evolution and development of water and soil conservation ecosystems (irrigation systems) in Sri Lanka. In 52nd Annual Sessions of the Sri Lanka Association for the Advancement of Science (SLAAS), Seminar on Aesthetics in Science, University of Kelaniya, Kelaniya, 25-29 November 1996. Ratmalana, Sri Lanka: Vishva Lekha, for Sri Lanka Pugwash Group. pp.5-73.
(Location: IWMI HQ Call no: 333.91 G744 SRI Record No: H042482)
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