1. E-mail: katepaga_vijaykumar@yahoomail.com
PHYSICO-CHEMICAL STUDIES ON BENNITHORA DAM
GULBARGA DISTRICT, KARNATAKA.
K. VIJAYKUMAR, RAJASHEKAR M.,
SHASHIKANTH M. AND VASANTHKUMAR B.
Department of Zoology
Gulbarga University
Gulbarga
KARNATAKA

2. INTRODUCTION:
Limnology plays an important role in the decision making process for problems of pollution control and aquaculture practices.

3. MATERIALS AND METHODS
The Bennithora Dam is near Gulbarga city (760-04’ to ’ and ’ to ’).
This reservoir spreads over 45 sq. miles. The maximum depth is 25 feet during monsoon.
Water samples were collected on monthly basis and Physico-chemical parameters were estimated by the Standard Methods (APHA,1985).

4. Water Temp:- Min: June. Max. : May
Atmospheric Temp:- Max.: May Min: June

6. Winkler’s Iodometric Method : Max: Feb. Min: Aug.

7. Total Alkalinity:- Max: Nov. & Feb.
Total hardness:- Max: June Min: Nov. & Dec.
EDTA Method.

8. Titrimetric Method

9. Phosphate:-Stannous Chloride method
Max:-Nov Min:- Dec.
Ammonical nitrogen:-Nesslerization Method
Max:- Feb

10. AgNO3 + K2CrO4
Max:-July & Aug. Min:- March & April

11. Conclusion
All the parameters are with in the permissible limit.
Chloride is even less than desirable.
Nevertheless few stations have shown higher values than the
maximum permissible limit.
Ammonical nitrogen is slightly higher than maximum permissible limit.
This is signal/ indication of pollution.
Though the reservoir is productive, due to sewage and fertilizers it is
slightly turning towards pollution.

12. Thank U