Browsing by Author "Jayakody, Priyantha"

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Anicut Systems in Sri Lanka: The Case of Upper Walawe River Basin
(2003) Molle, François; Jayakody, Priyantha; de Silva, Shyamalie
"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 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."
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."
Drivers and Characteristics of Wastewater Agriculture in Developing Countries: Results from a Global Assessment
(2008) Raschid-Sally, Liqa; Jayakody, Priyantha
"In 4 out of 5 cities in developing countries, wastewater is used to cultivate perishable crops for urban markets. Such practices create a health risk but provide important livelihood benefits. This study through an analysis of 53 cities in developing countries, contributes to understanding the factors that drive wastewater use. The main drivers are (1) increasing urban water demand without wastewater treatment causing pollution of irrigation water sources; (2) urban food demand favoring agriculture close to cities where water sources are polluted; and (3) lack of cheaper, similarly reliable or safer water sources. Poverty, which constrains the infrastructure needs of urbanization, is an added factor. The study makes policy recommendations stressing on, effectively applying the WHO guidelines, linking investments in water supply with sanitation for maximum beneficial impact on water pollution, and involving actors at both the national and local level, for water quality improvements and health risk reduction."
Small Tank Cascade Systems in the Walawe River Basin
(2004) Somaratne, P. G.; Jayakody, Priyantha; Molle, François; Jinapala, K.
"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."