3. A small city discharges 3.5 m/s of sewage having a BOD of 30.0 mg/L and a dissolved oxygen concentration of 6.0 mg/L into a river that has a flow rate of 7.5 m/s a negligible BOD concentration, and a dissolved oxygen concentration of 8.0 mg/L Downstream of the discharge. the river has an average depth and width of 2.0 m and 25 m, respectively. The saturation value for dissolved oxygen in the stream for summertime low flow conditions is 8.5 mg/L. The decomposition rate coefficient is 0.35 /day. a Calculate the reaeration rate coefficient using the O'Connor-Dobbins formula. Reaeration rate coefficient day b. Find the critical travel time and the minimum dissolved oxygen concentration. Critical travel time: day Minimum D.O. concentration: mg/ e Will the river meet a dissolved oxxygen water quality standard of 5.0 mg/L? O The standard would be met O The standard would not be met

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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3. A small city discharges 3.5 m/s of sewage having a BOD of 30.0 mg/L and a dissolved oxygen concentration of 6.0 mg/L into a river that has a flow rate of 7.5 m/s, a negligible BOD concentration, and a dissolved oxygen concentration of 8.0 mg/L. Downstream of the discharge, the river has an average depth
and width of 2.0 m and 25 m, respectively. The saturation value for dissolved oxygen in the stream for summertime low flow conditions is 8.5 mg/L. The decomposition rate coefficient is 0.35 /day.
a. Calculate the reaeration rate coefficient using the O'Connor-Dobbins formula.
day
Reaeration rate coefficient:
b. Find the critical travel time and the minimum dissolved oxygen concentration.
Critical travel time:
day
Minimum D.O. concentration:
mg/L
c. Will the river meet a dissolved oxygen water quality standard of 5.0 mg/L?
O The standard would be met
O The standard would not be met
Check
Transcribed Image Text:3. A small city discharges 3.5 m/s of sewage having a BOD of 30.0 mg/L and a dissolved oxygen concentration of 6.0 mg/L into a river that has a flow rate of 7.5 m/s, a negligible BOD concentration, and a dissolved oxygen concentration of 8.0 mg/L. Downstream of the discharge, the river has an average depth and width of 2.0 m and 25 m, respectively. The saturation value for dissolved oxygen in the stream for summertime low flow conditions is 8.5 mg/L. The decomposition rate coefficient is 0.35 /day. a. Calculate the reaeration rate coefficient using the O'Connor-Dobbins formula. day Reaeration rate coefficient: b. Find the critical travel time and the minimum dissolved oxygen concentration. Critical travel time: day Minimum D.O. concentration: mg/L c. Will the river meet a dissolved oxygen water quality standard of 5.0 mg/L? O The standard would be met O The standard would not be met Check
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