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[hftuo1983]

Dear All,

 

I got a question about how to calculate water flow depth in a horizontal pipe (open channel flow). 

 

as shown in attached drawing, water flows first along the HORIZONTAL pipe, and then falls over in an elbow at the end of the horizontal pipe.

 

My understanding is that the Manning equation may not be appropriate for this scenario, because:

 

1) there is nos slope in the horizontal pipe;

 

2) water depth is  affected by the flow at the elbow. 

 

So what equation or method should I use to calculate the water depth at a given flow rate and all given pipe parameters? 

 

Thanks very much 

 

Hanfei 

 

 

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[srvna90]

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