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Two rivers meet at a confluence. River A is has a flow of 20m /s, a DO level of 12mg/l and a five-day BOD of 1mg/l. River B is polluted and has a flow of 30m³/s, a DO level of 4mg/l and a five-day BOD of 34mg/l. The river velocity downstream of the confluence is 0.5m/s. The saturated DO level in the river is 12.0 mg/l, the BOD reaction rate constant is 0.25 day and the re-aeration constant of the river is 0.45 day¹. a) Calculate the minimum DO in the river and how far downstream of the confluence that this occurs.

Two rivers meet at a confluence. River A is has a flow of 20m /s, a DO level of 12mg/l and a five-day BOD of 1mg/l. River B is polluted and has a flow of 30m³/s, a DO level of 4mg/l and a five-day BOD of 34mg/l. The river velocity downstream of the confluence is 0.5m/s. The saturated DO level in the river is 12.0 mg/l, the BOD reaction rate constant is 0.25 day and the re-aeration constant of the river is 0.45 day¹. a) Calculate the minimum DO in the river and how far downstream of the confluence that this occurs.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Two rivers meet at a confluence. River A is has a flow of 20m³/s, a DO level of 12mg/l and a five-day BOD of 1mg/l. River B is polluted and has a flow of 30m³/s, a DO level of 4mg/l and a five-day BOD of 34mg/1. The river velocity downstream of the confluence is 0.5m/s. The saturated DO level in the river is 12.0 mg/l, the BOD reaction rate constant is 0.25 day and the re-aeration constant of the river is 0.45 day¹. a) Calculate the minimum DO in the river and how far downstream of the confluence that this occurs. b) Describe 3 assumptions of this calculation that may differ in reality compared to our simplified modelling. c) In up to 8 sentences, define 4 different types of water pollutants and describe their common sources, and consequences d) Describe the role of water temperature in aggravating pollutant impact, and suggest how this could be controlled from an industrial point of view
Transcribed Image Text:Two rivers meet at a confluence. River A is has a flow of 20m³/s, a DO level of 12mg/l and a five-day BOD of 1mg/l. River B is polluted and has a flow of 30m³/s, a DO level of 4mg/l and a five-day BOD of 34mg/1. The river velocity downstream of the confluence is 0.5m/s. The saturated DO level in the river is 12.0 mg/l, the BOD reaction rate constant is 0.25 day and the re-aeration constant of the river is 0.45 day¹. a) Calculate the minimum DO in the river and how far downstream of the confluence that this occurs. b) Describe 3 assumptions of this calculation that may differ in reality compared to our simplified modelling. c) In up to 8 sentences, define 4 different types of water pollutants and describe their common sources, and consequences d) Describe the role of water temperature in aggravating pollutant impact, and suggest how this could be controlled from an industrial point of view
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