Seasonal Variation in the Concentration of phosphorus in Chennai Lakes and assessment of water quality using the Trophic State Index

IJEP 42(3): 336-341 : Vol. 42 Issue. 3 (March 2022)

P.K. Raji1 and Marykutty Abraham2*

1. Sathyabama Institute of Science and Technology, Department of Civil Engineering, Chennai – 600 119, Tamil Nadu, India
2. Sathyabama Institute of Science and Technology, Centre for Remote Sensing and Geoinformatics, Chennai – 600 119, Tamil Nadu, India


Monitoring eutrophication is an important part of evaluating and managing lake ecosystems. The present study aims to sample and analyze the water quality of various lakes in and around Chennai city for the sustainable development of water bodies. The experiment was carried out by collecting water samples during various seasons and parameters, such as total phosphorus, chlorophyll and Secchi depth were used to calculate the trophic state index (TSI). The results are used to classify the lakes according to TSI. Several methods have been adopted for the classification of lakes and to indicate their trophic status. The Carlson’s trophic state index, the most commonly adopted method, based on productivity, is used to determine the TSI. Fifteen lakes were selected and samples were collected during rainy, winter and summer seasons during the year 2017. Seasonal fluctuations in the parameters (total phosphorus, Secchi depth, chlorophyll-a) were analyzed. Based on the parameters Carlson’s trophic state index (CTSI) was calculated for each lake and accordingly lakes were classified. The CTSI values in this study range between 32-88. Among the selected lakes many were classified as eutrophic and hyper-eutrophic based on CTSI value. Lakes Chetpet and Porur are classified as oligotrophic and mesotrophic, respectively. The seasonal fluctuations in the trophic state and effect of climate change, alarm the possibility of progression from oligotrophic to mesotrophic lakes would be helpful for policymakers and lake restoration programmes.


Eutrophication, Phosphorus, Secchi disc, Trophic state index


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