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14andyhigg
May25-09, 09:07 AM
Hi,

My name is Andy im a new user here. Im having a bit of trouble deriving the difference between the Francis Formula and the Torricelli Formula. I have the following question to work on as part of many which could be covered in an exam shortly:

Provide an expression for the Francis Formula used for calculating flow over a weir, explaining any improvement over the simple Torricelli derived formula and a reliance on the concept of contractions to a weir.

I am comfortable using each of the formulas and solving problems based on them but I am not too sure on how they relate to each other and the benefits of using one or the other.

Any advice would be much appreciated!