Volume No. 11 Issue No.: 1 Page No.: 142-150 July-September 2016




Jyothi Roopa S. K. * , Puttappa C. G.1, Lokesh K. V., Chandrashekar H.2 and Ranganna G.3

1. Department of Civil Engineering, M.S. Ramaiah Institute of Technology, Bengaluru (INDIA)
2. Department of Civil Engineering, Dr. Ambedkar Institute of Technology, Bengaluru (INDIA)
3. Department of Maths, J.B. Campus, Bangalore University, Bengaluru (INDIA)


Received on : May 10, 2016




Water occurs in nature and is associated with plants, animals and human beings. But, due to urbanization, agricultural activities and improper management, the reservoirs/ lakes are in the state of deterioration. The Dissolved Oxygen in reservoirs/ lakes decreases and the nutrients such as nitrogen and phosphorus content in reservoir water increases. This results in eutrophication of reservoirs/ lakes, thus deteriorating the quality of reservoir water. Hence, the assessment of the quality of reservoir water through an analysis of trophic status of the reservoir is very essential. The paper discusses the present trophic status of Arkavati Reservoir, having coordinates of latitude 12025’ N and longitude 77027’ E (in Kanakapura Taluk of Ramanagara District Karnataka, India). The analysis of water samples drawn from the reservoir were carried out. The results reveal that Reservoir is Mesotrophic in nature, if only Chlorophyll A parameter is considered. Further, the same reservoir water is being used to irrigate crops of its command area. Hence, a detailed analysis of contamination/ pollution level of the reservoir water is of prime importance to recommend suitable preventive measures to arrest further contamination of reservoir water. The field and laboratory work and results arrived at, are discussed in this full length paper. The present study indicates that, if the average value of TSI is considered according to Carlson’s Tropic Index, then, the quality of Reservoir water is converted to hyper eutrophic from eutrophic.


Keywords : Reservoir water, Wastewater/ sewage, Contamination/ Pollution of water, Nutrients, Tropic status