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Drainage Design - Spread on Roadway

by jjj888
Tags: design, drainage, roadway, spread
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jjj888
#1
Nov29-13, 08:49 PM
P: 23
I'm confused about how spread is calculated.

Looking at the FHWA Drainage Manual, page 4-9 (pdf page 99) gives a formula for computing spread T, but on an example sheet 4-14 (pdf page 104) spread is stated as being an iterative solution. I'm not really to clear on why there is two different procedures here.

Can anyone clarify this?
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