Volume No. 3 Issue No.: 1 Page No.: 1-8 July-Sept 2008

 

ANALYSIS OF WATER QUALITY ON MAHA OYA (SRI LANKA)

 

Charmila Pathirana1 and Nilanthi J.G.J. Bandara*2

1. Department of Forestry and Environmental Sciences, University of Sri Jayewardenepura, Colombo, (SRI LANKA)
2. Department of Forestry and Environmental Sciences, University of Sri Jayewardenepura, Colombo, (SRI LANKA)

 

Received on : March 12, 2008

 

ABSTRACT

 

Maha Oya, is one of the main rivers in Sri Lanka, very much used for drinking water extraction. It flows through five important districts of Sri Lanka offering water through fourteen water supply intakes. Only three of the associated plants offer conventional treatment for water. Several small to medium urban centers are located on the main stem of the river and on tributaries. Hence, the river receives much organic waste from the upstream. Industrial discharges and harmful anthropogenic activities are common in the final 50 km stretch of the river. This study aims to investigate the contamination of Maha Oya water around each intake points along the main river and find causes. Samples were collected from seventeen selected sampling locations during both high and low flow rate conditions. Analysis was done on pH, turbidity, DO, COD, BOD, phosphate, Nitrate, Sulfate, Chloride, Fluoride, Coliform and heavy metals which were selected based on the drinking water quality requirement of the country.

 

Keywords : Water quality, Industrial discharge, Anthropogenic activities.

 

 

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