Example A community discharges a waste flow of 1000m3/ day to a small stream. The 7-day, 10-year low flow in the stream is 5.74m3/min. The maximum stream temperature is 30C and 80 percent saturated. The BOD5 in the stream is 5mg/l above the sewage outfall. The values of K1 and K2 at 20C are 0.23/day and 0.46/ day respectively. K3,La, and SR are neglected. Determine the effluent BOD5 from the sewage treatment plant which will not deplete the dissolved oxygen concentration to less than 4mg/l at the 7-day, 10-year low flow