Browsing by Author "Ariyaratne, B. Ranjith"

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Balancing Irrigation and Hydropower: Case Study from Southern Sri Lanka
(2005) Molle, François; Jayakody, Priyantha; Ariyaratne, B. Ranjith; Somatilake, H. S.
"This report provides a case study from the Walawe river basin, in southern Sri Lanka, where a similar situation occurs. The Walawe river basin covers approximately 3,000 km2 and extends from the ridge of the central highlands of Sri Lanka, at an altitude of over 2,000 meters, down to the southern coast. The basin offers a clear contrast between, on the one hand, its highlands and its intermediate mountainous association of ridges and valleys and, on the other, the lowland plain itself. Precipitation varies significantly in the basin from over 3,000 mm in the northwestern tip to around 1,000 mm along the seashore. The highlands are cut by many valleys in which small streams, which are often perennials, can be found. They feed the Walawe river, which has an average discharge to the sea of 1.1 billion m3/yr."
Characterization and Monitoring of the Regolith Aquifer within Four Selected Cascades (Sub-watersheds) of the Malala Oya Basin
(2007) Panabokke, Chris R.; Ariyaratne, B. Ranjith; Seneviratne, Anoja; Wijekoon, Deepthi; Molle, François
"The groundwater present in the hard rock region of the dry zone of Sri Lanka is made up of the shallow 'Regolith Aquifer' and the deeper fracture zone aquifer is now clearly recognized. However, up to now no study had been carried out or reported in this country on the dynamic nature of this shallow regolith aquifer. This is the very first study carried out and reported in this regard. As part of the study, the impact of the Mau Ara trans-basin canal on the groundwater conditions below the area of influence of this trans-basin feeder canal has also been examined."
Developing Effective Institutions for Water Resources Management: A Case Study in the Deduru Oya Basin, Sri Lanka
(2003) Somaratne, P. G.; Jinapala, K.; Perera, L. R.; Ariyaratne, B. Ranjith; Bandaragoda, D. J.; Makin, Ian
"The overall objective of the case study conducted in Sri Lanka was to help the government of Sri Lanka to improve the institutions managing scarce water resources within the frame work of integrated water resources management. This case study included a comprehensive assessment of the existing physical, socio-economic and institutional environment in the river basin and also the long term changes that are likely to take place."
Institutional Changes to Reduce Land Preparation Delay in the North Central Province of Sri Lanka
(2003) Loeve, Ronald; Somaratne, P. G.; Ariyaratne, B. Ranjith; Anputhas, Markandu; Jinapala, K.
"Although many irrigation systems in the dry zone of Sri Lanka have water shortage problems, water consumption is very high during land preparation. This paper analyzes the impact of institutional interventions on efficient water management, especially during the land preparation period. It provides a comprehensive understanding of the factors behind prolonged periods of land preparation so that system managers and farmers communities can develop appropriate interventions to reduce water consumption."
Institutions, Impact Synergies and Food Security: A Methodology with Results from the Kala Oya Basin, Sri Lankan
(2007) Saleth, Rathinasamy Maria; Dinar, Ariel; Neubert, Susanne; Kamaiah, Bandi; Manoharan, Seenithamby; Abayawardana, Sarath; Ariyaratne, B. Ranjith; de Silva, Shyamalie
"The success of development programs depends on the role of underlying institutions and the impact synergies from closely related programs. Existing literature has limitations in accounting for these critical factors. This paper fills this gap by developing a methodology, which can quantify both the institutional roles in impact generation and the impact synergies from related programs. The methodology is applied to the Kala Oya Basin in Sri Lanka for evaluating the impacts of three development programs and 11 institutions on food security. The results provide valuable insights on the relative roles of institutions and the varying flow of impact synergies both within and across impact pathways."