Anicut systems in Sri Lanka: The case of the Upper Walawe River Basin


Book Description

This exploratory study was designed to capture the main features of agrarian change in the upper part of the basin that depends mostly on anicuts. These anicuts amount to 59 percent of the total basin anicuts in terms of numbers, but to only 43 percent in terms of irrigated area. They are generally very old (the history of some of them goes back to 2000 years; see below) and obviously, many changes have occurred during this time. The study does not allow the reconstitution of all past transformations but offers some insight on recent changes: changes in population pressure over resources and changes in hydrology, crop choice, livelihoods and collective action. The analysis is based on exploratory surveys carried out by the authors and by students of the University of Sabaragamuwa and is not a detailed or in-depth investigation of agricultural systems in the Upper Walawe basin. However, it provides a useful outline of the situation in this part of the basin.







Small tank cascade systems in the Walawe River Basin


Book Description

This report on small tank cascade systems is based on a study conducted on seven tank cascades of the Walawe river basin, one of the three main river basins in the Ruhuna benchmark basins selected by the International Water Management Institute (IWMI) for its benchmark basin study.The overall objective of this study is to document the situation of small tank cascade systems in the basin, paying special attention to their evolution under agro-ecological, socio-economic and institutional changes on an unprecedented scale in the country after the introduction of open market economic policies in the 1970s, and thereby to contribute to the existing knowledge on small tank cascades, a key feature of water resources in the Dry zone regions2 of Sri Lanka since time immemorial.




Economics and politics of water resources development: Uda Walawe Irrigation Project, Sri Lanka


Book Description

The Uda Walawe Irrigation and Resettlement Project (UWIRP) located in the Southern dry zone of Sri Lanka was initiated in the early 1950s. The original plan for the UWIRP was a highly ambitious social, economic and physical engineering project aimed at creating a modern, profitable agriculture sector. This report examines the history of water resources development and investment decisions for the UWIRP over a period of 50 years and uncovers underlying processes that shaped the evolution of the project and highlights the limitation of viewing development as a mere set of technical and social engineering endeavors.




Balancing irrigation and hydropower: Case study from Southern Sri Lanka


Book Description

This report analyzes a case from southern Sri Lanka, where the Samanalawewa dam and the Kaltota Irrigation Scheme (KIS) compete for the water of the Walawe river. At the catchment level, it is shown that dam releases are well attuned to the needs of KIS and to the occurrences of natural runoff, and that little of the dam water is "lost" to the river.




Promise, Trust and Evolution


Book Description

From land management to water rights, this volume looks at the current status of Common Property Resources, or CPRs, in South Asia. Developed countries, have managed to establish well-defined property rights over numerous resources and in some instances extended non-exclusionary rights over privately owned resources over an extended period of time. In the developing world, however, the share of community property is extensive, either as a response to an expanding market or because the exposure to markets in still in its nascent stage. This coupled with the demands of globalization, has led to the co-existence of both community ownership of resources as well as an evolving private property rights market. This tension between public versus private ownership rights is particularly relevant in the developing countries of South Asia, not only because of its shared history but also because of its resources frequently cross national boundaries. This book tells the story of CPRs and the commons in a rapidly changing South Asia. Including contributions from those working with natural resources in Bhutan, India, Nepal, Pakistan, and Sri Lanka, the papers discuss issues such as equity in distribution; efficiency and productivity of resources; sustainability of resources; and institutional transition and governance.







An assessment of hydrology and environmental flows in the Walawe River Basin, Sri Lanka


Book Description

Quantification of hydrological processes and water requirements of aquatic ecosystems is required for many projects related to environmental security and efficient water use in agriculture. This also applies to the Asian monsoon region. This paper focuses on the Walawe River basin, located in a semi-arid zone of southern Sri Lanka. The two major reservoirs in the upstream and middle reaches of the river with a total capacity of 486 million cubic meters (MCM) have significantly affected the hydrology of the river, with associated adverse environmental and social consequences.




Environmental Water Requirements in Mountainous Areas


Book Description

Environmental Water Requirements in Mountainous Areas presents comprehensive and scientifically sound approaches and methodologies for estimating the environmental water requirements and tradeoffs for water allocation by analyzing anthropogenic and natural water needs. The book covers environmental water management issues in mountainous areas, specifically focusing on the Mediterranean region which exhibits significant contrasts in its demographic and hydrologic features. The authors include paradigms and information that will be useful for water resources managers, decision makers, scientists working in the fields of ecology and water resources management, engineers that design hydraulic works, and environmental policymakers. - Offers a complete background screening on theoretical and practical guidelines on estimating environmental water requirements in mountainous areas - Promotes and guides interdisciplinary work with information on policies and best practices in the field of ecological flows and water resources management - Provides examples and case studies on the successful implementation efforts of ecological flows to analyze lessons learned and overcome practical issues and solutions