Your search found 6 records
1 Siddeek, F. Z.; Dillaha, T. A.; Loganathan, G. V. 1989. Water management for low land rice irrigation. ESCAP Water Resources Journal, 159:17-24.
Water management ; Rice ; Irrigation efficiency ; Water balance ; Models ; Irrigation scheduling / Sri Lanka / Kalawewa
(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.
2 Gunawardhana, H. D.; Adikari, A. M. K. R. 1981. Studies on the quality of irrigation waters in Kalawewa area. Journal of the National Science Council of Sri Lanka, 9(2):121-148.
(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)
Irrigation programs ; Development projects ; Diagnostic techniques ; Irrigated farming ; Training ; Irrigation canals ; Social aspects ; Water distribution ; Water delivery ; Open channels ; Water loss ; Drainage ; Water control ; Water use efficiency ; Resource management ; Farmer participation ; Institution building ; Soil properties ; Cropping systems ; Rice ; Fertilizers ; Reservoirs / Sri Lanka / Kalawewa / Rajangana Scheme / Mahaweli Project
(Location: IWMI-HQ Call no: P 5139 Record No: H024290)
4 Murray-Rust, H.; Cramer, R. 1979. Study on the Gal Oya Water Management Project. Unpublished report. iii, 59p.
Irrigation programs ; Irrigation management ; Irrigation canals ; Water management ; Organizational development ; Farmer-agency interactions ; Farmers' associations ; Water user associations ; Water allocation ; Water distribution ; Water conservation ; Communication ; Conflict ; Social aspects ; Economic aspects ; Water rates ; Institutions / Sri Lanka / Mahaweli Project / Kaudulla / Kalawewa / Gal Oya
(Location: IWMI-HQ Call no: P 5324 Record No: H024931)
5 Wickramaarachchi, T. N.; Wijesekera, N. T. S. 2001. Comparison of irrigation water issue options: Case study from System H of Mahaweli Development Programme. Tropical Agricultural Research, 13:143-155.
Irrigation programs ; Irrigation canals ; Water distribution ; Rice ; Water requirements / Sri Lanka / Mahaweli Programme / Anuradhapura / Thambuttegama / Kalawewa
(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.
Irrigation systems ; History ; Tanks ; Reservoirs ; Open channels / Sri Lanka / Pandikulama / Magama weva / Uda Walawe / Kalawewa
(Location: IWMI HQ Call no: 333.91 G744 SRI Record No: H042482)
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