Your search found 7 records
1 Weragala, Neelanga. 2004. Estimation of monthly river flows for un-gauged catchments in Sri Lanka: a non-linear spatial interpolation approach. In Conference on Sri Lanka: current challenges, University of Colombo, Faculty of Graduate Studies, 17-18 December 2004. Proceedings. Vol. 1. Colombo, Sri Lanka: University of Colombo. pp.3-14.
River basins ; Flow ; Measurement ; Estimation ; Catchment areas ; Runoff ; Hydrology / Sri Lanka / Agaliya / Gin Ganga / Kelani Ganga / Kalu Ganga
(Location: IWMI-HQ Call no: IWMI 574.526323 G744 WER Record No: H035895)
2 Weragala, Neelanga; Smakhtin, Vladimir. 2004. Simulating hydrological alterations in the conditions of limited data: lessons from the Walawe River Basin in Sri Lanka. In Herath, S.; Pathirana, A.; Weerakoon, S. B. (Eds.). Proceedings of the International Conference on Sustainable Water Resources Management in the Changing Environment of the Monsoon Region. Bandaranaika Memorial International Conference Hall, Colombo, Sri Lanka, 17-19 November 2004. Vol.1. Colombo, Sri Lanka: National Water Resources Secretariat. pp.251-259.
River basins ; Stream flow ; Hydrology ; Simulation models ; Soil water ; Evaporation ; Assessment ; Surface runoff ; Land use ; Percolation / Sri Lanka / Walawe River Basin / Thimbolketiya Catchment / Rakwana Oya
(Location: IWMI-HQ Call no: IWMI 574.526323 G744 WER, 333.91 G000 HER Record No: H035896)
3 Anputhas, Markandu; Ariyaratne, B. Ranjith; Gamage, Nilantha; Jayakody, Priyantha; Jinapala, Kiribandage; Somaratne, Pallewatte G.; Weligamage, Parakrama; Weragala, Neelanga; Wijerathna, Deeptha. 2005. Bringing Hambantota back to normal: a post-tsunami livelihoods needs assessment of Hambantota District in southern Sri Lanka. Colombo, Sri Lanka: International Water Management Institute (IWMI). ix, 59p.
Natural disasters ; Research methods ; Mapping ; Villages ; Income generation ; Statistics ; Irrigated farming ; Livestock ; Fisheries ; Economic aspects ; Rehabilitation / Sri Lanka / Hambantota
(Location: IWMI-HQ Call no: IWMI 363.348068 G744 ANP Record No: H036747)
(2.74 MB)
4 Weragala, Neelanga; Gamage, Nilantha. 2005. Definition of a Tsunami safe boundary for Sri Lanka: a case study in the coastal zone of Galle, Matara and Hambantota Districts. [Abstract only]. Abstract of paper presented at LOICZ II Inaugural Open Science Meeting, Egmond aan zee, Netherlands, 27-29 June 2005. 1p.
(Location: IWMI-HQ Call no: IWMI 353.95 G744 WER Record No: H037592)
(0.11 MB)
5 Smakhtin, Vladimir; Weragala, Neelanga. 2005. An assessment of hydrology and environmental flows in the Walawe River Basin, Sri Lanka. Colombo, Sri Lanka: International Water Management Institute (IWMI) v, 13p. (IWMI Working Paper 103) [doi: https://doi.org/10.3910/2009.278]
River basins ; Hydrology ; Stream flow ; Environmental effects ; Reservoirs ; Precipitation / Sri Lanka / Walawe River Basin
(Location: IWMI-HQ Call no: IWMI 551.483 G744 SMA Record No: H038045)
(736 KB)
6 Dissanayake, Priyanka; Weragala, Neelanga; Smakhtin, Vladimir. 2010. Environmental flow assessment: recent examples from Sri Lanka. In Evans, Alexandra; Jinapala, K. (Eds). Proceedings of the National Conference on Water, Food Security and Climate Change in Sri Lanka, BMICH, Colombo, Sri Lanka, 9-11 June 2009. Vol. 2. Water quality, environment and climate change. Colombo, Sri Lanka: International Water Management Institute (IWMI). pp.23-35.
Environmental flows ; Assessment ; Rivers ; Water use ; Multiple use ; Water requirements ; Case studies / Sri Lanka / Walawe Ganga / Menik Ganga / Pilinnawa Wetland / Yala National Park
(Location: IWMI HQ Call no: IWMI 631.7 G744 EVA Record No: H042856)
Assessment and provision of Environmental Flows (EF) is important for the protection of aquatic ecosystems. EF are a set of discharges of a particular magnitude, frequency and timing that are necessary to ensure a certain range of benefits from a river. Such flows need to be scientifically determined and economically justified. Limited exposure to the concept of EF exists in developing countries. This paper gives two recent relevant example studies, which were conducted by IWMI, with foci on EF Assessment (EFA) and valuation of EF benefits in the Walawe and Menik Ganga river basins located in a semi-arid zone of southern Sri Lanka. The Walawe example illustrates the simple method for estimation of EF. The EF are approximated at two sites along the main stream of the Walawe River, which are located below the two main reservoirs. A desktop method is used, which is based on simulated, unregulated daily flow time series and their flow duration curves. The study also illustrates how the required hydrological information can be generated for the locations where EF assessment is intended – quickly and in conditions of limited observed data. The second Menik Ganga example is used as a case study to evaluate the costs and benefits of environmental water allocations. The EF components evaluated include the water needs for religious festivals, and the requirements of the Yala National Park, the Pilinnawa coastal wetland and grasslands, and the Yala Fisheries Management Area (YFMA) off the coast. Almost all estimates are based on use values of EF such as marketed goods and recreation. The paper intends to stimulate discussion and further research in the fields of EF assessment and economic valuation.
7 Smakhtin, Vladimir; Thenkabail, Prasad; Gamage, Nilantha; Weragala, Neelanga. 2005. Drought assessment and monitoring in South Asia using climate and remote sensing data. In Mathur, G. N.; Chawla, A. S. (Eds.). Water for sustainable development - towards innovative solutions: proceedings of the XII World Water Congress, New Delhi, India, 22-25 November 2005. Vol. 3. New Delhi, India: Central Board of Irrigation and Power; Montpellier, France: International Water Resources Association (IWRA). pp.6:97-6:110.
Drought ; Rain ; Assessment ; Monitoring ; Risks ; Indicators ; Remote sensing ; Data ; Indicators / South Asia
(Location: IWMI HQ Call no: 333.91 G000 MAT Record No: H045961)
(1.07 MB)
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