1. HYDROCHEMICAL CHARACTERISTICS OF WATER IN DALVOY LAKE, MYSORE CITY Mahesha * & A. Balasubramanian ** * Research Scholar, Department of Environmental Science, University of Mysore, Manasagangothri,Mysore-570 006. E-mail: mahekalasa@yahoo.co.in ** Professor and Director, EMMRC, University of Mysore, Manasagangothri, Mysore-570006. E-mail: emmrc1@gmail.com emmrc1@gmail.com

2. CONTENTS INTRODUCTION INTRODUCTION STUDY AREA STUDY AREA MATERIAL AND METHODS MATERIAL AND METHODS RESULTS RESULTS CONCLUSION CONCLUSION

3. INTRODUCTION Aquatic ecosystem performs numerous functions. Aquatic ecosystem performs numerous functions. Lakes form an important fresh water ecosystem. Lakes form an important fresh water ecosystem. Anthropogenic activities have altered the ecosystem. Anthropogenic activities have altered the ecosystem. Dynamics of Lake ecosystems. Dynamics of Lake ecosystems. Aims to evaluate chemical parameters of a lake. Aims to evaluate chemical parameters of a lake.

4. STUDY AREA Dalvoy Lake in Mysore City. Dalvoy Lake in Mysore City. Area is 359 acres, length 2.2 Km. Area is 359 acres, length 2.2 Km. It is in the southwest direction. It is in the southwest direction. Latitude 12  14’N and 12  16’N. Latitude 12  14’N and 12  16’N. Longitude of 76  38’E and 76  39’E. Longitude of 76  38’E and 76  39’E. An elevation of 707.1 above mean sea level. An elevation of 707.1 above mean sea level.

12. METHODOLOGY Samples were collected from the lake. Samples were collected from the lake. To find out depthwise variation of quality, some samples were collected from depth varying 4-12 feet. To find out depthwise variation of quality, some samples were collected from depth varying 4-12 feet. Samples were analysed following the standard procedures. Samples were analysed following the standard procedures. The chemical analysis results were processed using the computer programme HYCH. The chemical analysis results were processed using the computer programme HYCH.

13. RESULT TDS ranges between 773 and 837mg/L(500mg/L). TDS ranges between 773 and 837mg/L(500mg/L). Ca &Mg 98 and 75mg/L, against 75 and 30 mg/L. Ca &Mg 98 and 75mg/L, against 75 and 30 mg/L. Cl 179 mg/L (250mg/L). Cl 179 mg/L (250mg/L). Na 129 mg/L (200mg/L), NO 3 28mg/L (45mg/L) and SO 4 27 mg/L (200mg/L), within the permissible limit as per ISI standards. Na 129 mg/L (200mg/L), NO 3 28mg/L (45mg/L) and SO 4 27 mg/L (200mg/L), within the permissible limit as per ISI standards.

14. RESULT Handa’s Classification-both permanent and temporary hardness. Handa’s Classification-both permanent and temporary hardness. Cu 0.192 ppm (0.05ppm), Ni 0.376 ppm (0.02ppm) and Mn 0.144ppm (0.1ppm) are above ISI prescribed standard limits. Cu 0.192 ppm (0.05ppm), Ni 0.376 ppm (0.02ppm) and Mn 0.144ppm (0.1ppm) are above ISI prescribed standard limits.

15. Fig.2 Flow Chart of the Hydrochemical data processing Program ‘HYCH’

19. CONCLUSION Water pollution is not only an aesthetic problem. Water pollution is not only an aesthetic problem. Ca, Mg, Cu, Ni & Mn concentration are more. Ca, Mg, Cu, Ni & Mn concentration are more. Cu-seepage of effluent paper industry, agricultural activities. Municipal waste and sewage. Cu-seepage of effluent paper industry, agricultural activities. Municipal waste and sewage. Ni & Mn might be entering through the waste waters exhaused from automobile workshops, service station, etc. Ni & Mn might be entering through the waste waters exhaused from automobile workshops, service station, etc. Lake water seems to be suitable for agriculture. Lake water seems to be suitable for agriculture. Encroachment along the sides should be checked. Encroachment along the sides should be checked.

20. Thank you