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Assessment of Soil Erosion in Uma Oya Catchment, Sri Lanka

Authors:

B. A. R. H. Dias,

Sabaragamuwa University of Sri Lanka, Belihuloya, LK
About B. A. R. H.
Department of Natural Resources, Faculty of Applied Sciences
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E. P. N. Udayakumara ,

Sabaragamuwa University of Sri Lanka, Belihuloya, LK
About E. P. N.
Department of Natural Resources, Faculty of Applied Sciences
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J. M. C. K. Jayawardana,

Sabaragamuwa University of Sri Lanka, Belihuloya, LK
About J. M. C. K.
Department of Natural Resources, Faculty of Applied Sciences
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S. Malavipathirana,

Sabaragamuwa University of Sri Lanka, Belihuloya, LK
About S.
Department of Physical Sciences and Technology, Faculty of Applied Sciences
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D. A. T. W. K. Dissanayake

Industrial Technology Institute, Bauddhaloka Mawatha, Colombo 07, LK
About D. A. T. W. K.
Residue Analysis Laboratory
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Abstract

Soil erosion is one of the major threats which affects farm productivity and water quality in river catchments. Quantification of human-induced soil loss is an imperative measure in catchment management. Among the catchments in Sri Lanka, the highest sediment yield has been reported from the Upper Uma Oya catchment (UOC) which is a sub-catchment of the Upper Mahaweli catchment. The Mahaweli watershed is the most important watershed in Sri Lanka since the size and the economic importance of it. Hence, this study was conducted considering the ten selected sub-watersheds of Uma Oya Watershed (UOW) in Sri Lanka to quantify soil erosion. Soil erosion of UOW was calculated using Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) Sediment Delivery Ratio (SDR) model. It was found that the current soil erosion rates in the watershed is varied between 14.0–648.6 t/ha/yr. Results of the study disclose that the soil erosion rates of UOW are 3 to 130 times faster than the soil loss tolerance in Sri Lanka. Findings of the study suggest that the implementation of sustainable watershed management options are crucial in order to reduce soil erosion and to enhance the quality of the watershed.
How to Cite: Dias, B.A.R.H., Udayakumara, E.P.N., Jayawardana, J.M.C.K., Malavipathirana, S. and Dissanayake, D.A.T.W.K., 2019. Assessment of Soil Erosion in Uma Oya Catchment, Sri Lanka. Journal of Environmental Professionals Sri Lanka, 8(1), pp.39–51. DOI: http://doi.org/10.4038/jepsl.v8i1.7875
Published on 31 Mar 2019.
Peer Reviewed

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