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Volume X Issue II

1 paper(s)

Water Quality in Different Inlet and Outlet Canals Connected to *Nuwarawewa, Anuradhapura*, Sri Lanka

R.P.L.N. Ranasinghe, D.M.S.H. Dissanayaka, R.A.A.S. Rathnayaka, K.G.S. Nirmanee, J.P.H.U. Jayaneththi · February 2021 · pp. 01-06

This study was conducted to assess the water quality of inlet and outlet canals connected Nuwarawewa, Anuradhapura, Sri Lanka. Seven major inlets and one outlet canals connected to Nuwarawewa, Anuradhapura was identified. Water samples were collected from a selected location of each inlet and outlet canal in one-month interval for three months period. Soil samples (0-30 cm) were collected from each selected location at the second time point. Water quality parameters such as pH, Electrical conductivity (EC), Dissolved Oxygen (DO), Total Dissolved (TDS), NO3--N, NH4+-N, available phosphorus (Av. P), alkalinity and heavy metals (Cd and As) concentrations were determined in each water sample. Soil samples were analyzed for pH, EC, total N, Av. P, Cd and total As contents. The results showed that pH, DO, TDS, NH4+-N, and Av. P of some in some tested water samples were higher and other parameters were within permissible levels according to WHO drinking water quality standards. Higher total N in all tested soil samples and lower Av. P values in many tested soil samples (except one) were observed in comparison to the reference values in literature. According to European Regulatory Standards, As concentrations in many soil samples (except one) within the permissible levels and Cd was not detected. Considerable temporal variations in water quality parameters were observed in inlet and outlet canals during the study period. The chemical properties of soil inside each canal were significantly altered by the quality of water being carried out by the respective canal. These result further revealed that impacts of surrounding land use on water pollution in inlet water canals connected to Nuwarawewa are higher. It could be concluded that the implementation of a pollution management plan is required to prevent further pollution through continuous future researches.

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