This is in response to @jwilkerson post from years ago, found in this post:
The referenced formula is here:
http://rctlma.org/Portals/7/documents/pamphlets/plan_check_curb_return_design.pdf ArchiveLink
Not sure what the error he was referencing. It looks like the G2 arrow shown in the image is going in the wrong direction. I think it should be going from PI1 to B direction for the flow of water. It looks like they corrected the error in the PI3 by having the formula reverse the G2 slope. Here is a link to an Excel spreadsheet and a link to a drawing showing a plane solution that checks the values via a model. Both the drawing and Excel spreadsheet should be checked for correctness. It is provided only as a reminder to myself, since I’ve created this Excel spreadsheet before and forgot where I put it. Hopefully Google will find it next time I’m looking for it.
County or Riverside PLANE METHOD CURB RETURN DESIGN.
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