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Determining Span of Wingwall

Determining Span of Wingwall

Determining Span of Wingwall

(OP)
Hi. What is the correct way to determine the length of a wingwall with a 72" round pipe?  The skew angle between the culvert and the headwall is 90 degrees, and the wingwall flare angles are 60 degrees. The berm slope is 1 on 2.5.  

One methodology I found is from CDOT's Drainage Design Manual. The formula for wingwall length = Z (m-k)/sin theta where Z =  slope, m = pipe diameter +1.33, k = .5(pipe diameter) - 1, and theta = skew angle.

Thanks.

RE: Determining Span of Wingwall

Just fit the slope.

RE: Determining Span of Wingwall

As LCruiser stated fit the slope.  I typically assume a 2:1 slope from end of wing to edge of culvert to set the length.

RE: Determining Span of Wingwall

Pure56, if you are are CE you should be able to use descriptive geometry or analytical geometry to figure this one out.

RE: Determining Span of Wingwall

Txdot design manual has a good example. It should be online.

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