Structural Analysis
Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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A river traveling at a velocity of 10 km/day has a dissolved-oxygen content of 5 mg/L and an ultimate CBOD of 25 mg/L at distance x = 0 km, that is, immediately downstream of a waste discharge. The waste has a CBOD decay coefficient, kd, of 0.2/day. The stream has a reaeration rate coefficient, kr, of 0.4/day and a saturated dissolved-oxygen concentration of 9 mg/L. (a) What is the initial dissolved-oxygen deficit? (b) What is the location of the critical point, in time and distance? (c) What is the dissolved-oxygen deficit at the critical point? (d) What is the dissolved-oxygen concentration at the critical point?
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Transcribed Image Text:A river traveling at a velocity of 10 km/day has a dissolved-oxygen content of 5 mg/L and an ultimate CBOD of 25 mg/L at distance x = 0 km, that is, immediately downstream of a waste discharge. The waste has a CBOD decay coefficient, kd, of 0.2/day. The stream has a reaeration rate coefficient, kr, of 0.4/day and a saturated dissolved-oxygen concentration of 9 mg/L. (a) What is the initial dissolved-oxygen deficit? (b) What is the location of the critical point, in time and distance? (c) What is the dissolved-oxygen deficit at the critical point? (d) What is the dissolved-oxygen concentration at the critical point?
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