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how to calculate max flow without velocity info

how to calculate max flow without velocity info

how to calculate max flow without velocity info

(OP)
I need to determinate the maximum flow that can go trough an open flow channel (without measuring it) by calculating the max flow that can go through a bridge upstream. That is, I need to calculate the max flow using the area of the bridge opening and the terrain inclination.
Any thoughts?

RE: how to calculate max flow without velocity info

Such a simple question, such a complicated answer.  I don't think this forum can do it justice.

Obtain a copy of Open-channel Hydraulics by Ven Te Chow (my bible for opern channel hydraulics).  Towards the back of the book is a section which will be useful for calculating the flow through a bridge.  The only problem - you will need to read the first 300 pages to really understand what you are doing.

Good luck.

RE: how to calculate max flow without velocity info

Might want to post your question over in one of the civil engr forums.

RE: how to calculate max flow without velocity info



....additional to above, I was just contemplating before I saw your picture the situation when the stream was so strong or high the bridge didn't hold any longer...



For calculation: Either you could go the long way, or you could probably make a 'guesstimate' setting up an approximate 'static based' situation in a spreadsheet and play with variables like height of fall, max and minimum water speed and come out with a variation of very rough amounts of flow per seconds, giving at least an idea of max and min values.


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