Determining Span of Wingwall

[Pure56]

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.

 

[LCruiser]

Just fit the slope.

 

[gbam]

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.

 

[chicopee]

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

 

[ashhafPE]

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