Q#1 (40 points). For the river system shown below: Stream I Vi Vr = 10 m/min river ID M. 1000 m 12 = 5 m/min stream 2 K= k=o.1/hr throughout The river flow (Q=100 cu.m./sec) splits at point M to two streams of equal flow rate. At point D, an industrial plant discharges wastewater with BOD = 250 mg/L at Q = 15 cu.m. /sec. If the river BOD = 100 mg/L upstream of point D. Estimate the BOD in the beginning of stream 2? At what distance downstream point M can we draft water with BOD less than 25 mg/L from stream 2