George Stephenson, the railway pioneer, has been said to have carved the shape out of a turnip and asked the bricklayers to "make it like that" (with a strong Gordie accent, of course).
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An Englishman, an Irishman, and a Scotsman walk into a bar. The bartender turns to them, takes one look, and says "What is this - some kind of joke?"
That is a very open-ended question. You will need a lot of information to start with, the main ones being: expected peak flow rate, downstream water level and permissible upstream water level. You need to make some decisions regarding culvert shape, (circular pipe, rectangular, single cell, multi cell, etc.)
If you could elaborate on some fo your requirements?
Culvert Design
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