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Any ideas for a discharge coefficient on a broken pipe?

Any ideas for a discharge coefficient on a broken pipe?

Any ideas for a discharge coefficient on a broken pipe?

(OP)
Got a wild question -
If my 30-inch PCCP water main breaks, what is the flow rate coming out the hole?
There are a few assumptions - 130 feet head (about 55 psi) initially, and assume the hole is about 2 foot in diameter.
This looks like an orifice equation, but C = 0.6?  What might be a good starting place for a C?  Or is there another approach?

Any thoughts or ideas? (We have no field flow data, thank goodness!).

RE: Any ideas for a discharge coefficient on a broken pipe?

Per Crane TP-410, "K" factor of flow exiting a pipe is 1.0 regardless of the shape of the pipe exit (sharp edged or rounded).  Doubt this shape will ever exist in reality.  But this would be worse case.  Not sure what could cleanly shear-off a 30 inch pipe, and suspect that whatever can would be as big a concern as flow out of the pipe.

RE: Any ideas for a discharge coefficient on a broken pipe?

Why not model a few different CDs and determine the sensitivity?

"Sharing knowledge is the way to immortality"
His Holiness the Dalai Lama.

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