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A river is sampled at point A. The following results are measured: ultimate BOD=25 mg/L, dissolved...

A river is sampled at point A. The following results are measured: ultimate BOD=25 mg/L, dissolved oxygen= 6.5 mg/L, dissolved oxygen at saturation = 10.5 mg/L, deoxygenation rate=0.15 d-1, reaeration rate=0.35 d-1, stream velocity= 0.5 m/s. In how many days is the critical point downstream of Point A?

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som given men ultimate BOD = 25 mg/L (L) 6.5 mg/l Do (Dissolved oxygen) = = 10.5 myle (1.0) saturated Deoxy generation rate (

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