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CONCLUSION :
Field investigations along with laboratory analysis for the representative samples reveal that;
- Physico-chemical and biological analysis show parameters like turbidity (less than 10 NTU to 75 NTU), color (colorless to brownish color), total suspended solids (21.3 - 110 mg/l), phosphate (nil-0.032 mg/l), ammonia (<0.2 - 3 mg/l) and the presence of coliform bacteria mainly at Sharavathi, Sharmanavathi, Haridravathi and near by streams due to improper watershed management (agricultural activities along with monsoon erosion in the surrounding areas).
- Household surveys conducted in this region regarding agrobiodiversity and cultivation practices indicate the use of inorganic fertilisers in Hosanagar area (Linganamakki upstream catchment area). Also, the monsoon samples revealed the pollution due to non-point sources (agricultural activities in the catchment).
- Regular monitoring along with Best Management Practices (BMPs) is suggested for better ecological sustainability and their long-term sustenance by managing and conserving the watershed from point and non-point source of pollution that drained in to it.
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