Civil Engineering > GATE 2014 SET-2 > Water Quality
A waste water stream (flow = 2 m3/s, ultimate BOD = 90 mg/l) is joining a small river (flow = 12 m3/s, ultimate BOD = 5 mg/l). Both water streams get mixed up instantaneously. Cross-sectional area of the river is 50 m2. Assuming the de-oxygenation rate constant, k = 0.25/day, the BOD (in mg/l) of the river water, 10 km downstream of the mixing point is ______.
Correct : c
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