Hello, I am conducting a research project which analyzes flow rates of open channels. In one particular portion of the project, I am analyzing an open channel that is receiving inflow from a separate source. Let us say for the purpose of this question that the flow rate of the water coming out from the separate source and into the open channel is entering the open channel with a flow rate of "Q" meters^3/sec. If this is the case, then once the water enters the open channel, will it continue to travel with the same flow rate "Q" regardless of the composition of the channel (ie. if the channel is earthen or if it is cemented)? Or instead, will the flow rate change? And if the flow rate changes, how will it change in accordance to the composition of the open channel? Finally, whatever the answer to this question maybe, how may I prove that answer mathematically and what equation would I use for such a proof?

Please keep in mind that the water flow in the open channel is uniform, open channel flow.

I have attempted to analyze this problem with the Manning formula. However, because the Manning formula does not offer a function input for inflow flow rate, I was unable to obtain an answer.

Thank you very much and please excuse my poor terminology as I am not a civil engineer student.

## Comments rated to be Good Answers:

Re: Equation For Comparing Flow Rates of Canal as a Function of Inflow Flow Rate?" by Andrew Westman on 04/22/2017 12:30 AM (score 2)## Comments rated to be "almost" Good Answers:

Re: Equation For Comparing Flow Rates of Canal as a Function of Inflow Flow Rate?" by Tornado on 04/22/2017 1:10 AM (score 1)Re: Equation For Comparing Flow Rates of Canal as a Function of Inflow Flow Rate?" by Trevor Powers on 04/24/2017 11:45 AM (score 1)Re: Equation For Comparing Flow Rates of Canal as a Function of Inflow Flow Rate?" by Codemaster on 04/26/2017 6:15 AM (score 1)Re: Equation For Comparing Flow Rates of Canal as a Function of Inflow Flow Rate?" by Codemaster on 04/26/2017 9:24 AM (score 1)