INDIAN RIVERS WATER QUALITY ANALYSIS BY NEW DO-SAG EQUATIONRAVINDRA SHARMA, M.K. VERMA AND MEENA MURMUAbstract Streeter and Phelps (1925) developed the 1st important water quality model describing the BOD-DO relationship in a stream. The biodegradable waste when discharged into the stream, first consume oxygen present in main stream then within 5 days restore it by atmospheric re-aeration process. This DO model is based on complicated solution of differential equation for above process. Since 1925, it is only equation known as DO-Sag equation, used for determination of a river water quality. While carrying out water quality investigation of Shivnath River, in Chhatisgarh, the authors found New DO-Sag equation derived from a quadratic polynomial. It is tested with Shivnath River Data observed for Jan. to Dec.2017. To ensure its global acceptance the equation is tried with few more rivers of India. For this purpose, Published data in reputed journals of following rivers is used for DO-Sag modeling: (i) Shivnath River in Chhatisgarh: Water Samples during Jan. to Dec. 2017 from 12 sampling stations on Shivnath River distributed over 102 km length have been used for analysis Fig. (1). (ii) Kali River in Uttranchal: Water Samples from 10 sampling stations on Kali River distributed over 125 km length have been tested for analysis Fig. (2). (iii) Bhavani River in Tamil Nadu: Water Samples from 10 sampling stations on Bhavani River distributed over 92 km length have been tested for analysis. Fig. (3). (iv) Kuakhai River Bhubaneswar: Water Samples from 7 sampling stations on Kuakhai River distributed over 1.8 km length have been tested for analysis of physiochemical parameters Fig. (4). (iv) Cooum river in Chennai: Water Samples from 5 sampling stations on Cooum River distributed over 50 km length have been tested for analysis of physiochemical parameters Fig. (5).
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