Abstract
The work monitors the quality of river Indus, its variation with seasonal discharge of water at Kotri Barrage during April 1993-1995. A sample was collected after every 4 to 6 weeks and was analyzed for residues (Total, filterable, non filterable, volatile and fixed), pH, conductance, chloride, hardness, alkalinity, dissolved oxygen (DO), chemical oxygen demand (COD) nitrite, nitrate, phosphate, sulphate, nitrogen (Kjeldalh, organic and ammonia) and phenols. The results obtained were compared with permissible limits for river water (EEC). The total average residues transported was calculated to be 12.14 x 10(7) tonnes/year, which accounts for 8.8 x 10(6) tonnes/year used for irrigation and 11.26 x 10(7) tonnes/year drain down to Arabian Sea.