How Do You Calculate River Concentration After a Discharge?

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In summary, a river with a discharge of 10 MGD and a concentration of 150 mg/l receives a flow of 20 MGD at zero concentration upstream. After 15 miles downstream, the velocity is 10 mpd, followed by a slow moving region for the next 20 miles where the velocity drops to 2 mpd. With a decay rate of 0.2/day, the concentration at a point 35 miles downstream from the outfall is being asked. However, it is against policy to provide solutions unless the person asking for help has shown effort in solving the problem themselves.
  • #1
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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  • #2
yellow,

Please show what effort you have made towards solving this problem.
 
  • #3
anybody can do the calculation for me?
 
  • #4
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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