The BOD of a river just below a sewage outfall is 40 mg/L. At this point, the DO is at the saturated value of 9.8 mg/L. The deoxygenation rate coefficient is 0.22/day, and the reaeration rate coefficient is 0.9/day. The river is flowing at 10 miles/day. There are no other sources of BOD in the river. A. Find the critical distance downstream at which DO is at a minimum. B. Find the minimum DO.
The BOD of a river just below a sewage outfall is 40 mg/L. At this point, the DO is at the saturated value of 9.8 mg/L. The deoxygenation rate coefficient is 0.22/day, and the reaeration rate coefficient is 0.9/day. The river is flowing at 10 miles/day. There are no other sources of BOD in the river. A. Find the critical distance downstream at which DO is at a minimum. B. Find the minimum DO.
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter7: Seepage
Section: Chapter Questions
Problem 7.6P
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The BOD of a river just below a sewage outfall is 40 mg/L. At this point, the DO is at the saturated value of 9.8 mg/L. The deoxygenation rate coefficient is 0.22/day, and the reaeration rate coefficient is 0.9/day. The river is flowing at 10 miles/day. There are no other sources of BOD in the river.
A. Find the critical distance downstream at which DO is at a minimum.
B. Find the minimum DO.
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