Cascade Tank Water Quality Management: A Case Study in Thirappane Tank Cascade System, Sri Lanka

N. S. Abeysingha (Department of Agric. Engineering and Soil Science, Faculty of Agriculture, Rajarata university of Sri Lanka, Anuradhapura, Sri Lanka)
S. P. Dissanayake (Department of Agric. systems, Faculty of Agriculture, Rajarata university of Sri Lanka, Anuradhapura, Sri Lanka)
S. Sumanaweera (Global Research Foundation, Nugegoda, Sri Lanka)
S. S. K. De Silva (Global Research Foundation, Nugegoda, Sri Lanka)

Article ID: 3277


Tank cascade system (TCS) is a series of tanks located in a mesocatchment and has been accepted as a Globally Important Agricultural Heritage System found in Sri Lanka. Ecosystem components of the TCS play a major role in purifying water within the system. This study attempted to investigate the water quality status and the farmers’ willingness to rehabilitate the ecosystem components of the Thirappane TCS. Drinking and irrigation water quality parameters were tested in 34 locations and drinking and irrigation water quality indexes were calculated. Participatory rural appraisal and a questioner survey were conducted to gather social data. Water of TCS was observed to be appropriate for irrigation but not for drinking during the Maha cropping season. Based on the results of the Nitrate (as NO3 - ) and Total Phosphate (as PO4 3-), water of TCS can be categorized as eutrophic. Presence of ecosystem features of tank cascade system, annual income of the respondents, satisfaction on the quality of water for drinking, and the awareness about the tank cascade system significantly influenced the participatory decisions of the community on the rehabilitation of TCS. This study shall be an example and an eye opener to formulate sustainable tank cascade management plan.


Drinking water quality; Irrigation water quality; Social survey; Tank cascade system; Watershed management

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