How Do You Calculate River Concentration After a Discharge?

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Homework Help Overview

The discussion revolves around calculating the concentration of a substance in a river after a discharge, involving concepts from fluid dynamics and environmental science. The problem presents a scenario with varying flow rates and a decay rate of the substance over a specified distance downstream.

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  • Exploratory, Assumption checking

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  • Participants inquire about the original poster's efforts in solving the problem and emphasize the need for showing work before receiving assistance. There are questions about the calculation process and the implications of the given parameters.

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The conversation is currently focused on encouraging the original poster to share their attempts at solving the problem. There is an acknowledgment of the forum's policy against providing direct solutions without evidence of effort from the poster.

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Participants note the importance of demonstrating original effort in accordance with forum guidelines, which may influence the direction of the discussion.

yellowdoraemon
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I have a question about hydraulic environment...i hope that u can solve the problem for me if possible. thank you very much.

belowing is the question:
A river receives a discharge of 10 MGD at a concentrattion of 150 mg/l. The river flow upstream is 20 MGD at zero concentration. For 15 mi downstream, the velocity is 10 mpd. A region of slow moving water is then encountered for next 20 mi where the velocity drops to 2 mpd. If the decay rate of the substance is 0.2/day, what is the concentration at the point 35 mi downstream from the outfall?
 
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yellow,

Please show what effort you have made towards solving this problem.
 
anybody can do the calculation for me?
 
It is against the policy here to provide solutions to homework problems unless the OP has shown original effort. So if you tell us what you've tried, we can help you along.
 

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