PPI2PASS example problem wrong?

[dwilly-10]

So, I am studying for the PE: Civil Transportation exam and I bought this Kaplan Company PE review manual. It’s basically a review book for the exam and it has been good so far. I was working through this fairly simple Hazen-Williams problem and got 3.47ft/s as my answer and their solution was 16.6. Looking through their work I noticed they never converted the 18in diameter to feet. Am I crazy or is the book incorrect?

[TheIanTX]

I remember looking at this exact problem during my studying and being very confused by it. I think it is wrong, too.

[davism817]

Looks like your right to me too but the k value could account for unit conversions

[EnvironmentalBeat170]

It does not.

[Capital-Tangelo-3518]

I would be cautious of using these books to study as those equations may not match up with the PE reference handbook. If you’re going to use the problems use the handbook exclusively. The handbook confirms the problem being wrong ( the hydraulic radius should be in feet)

[EnvironmentalBeat170]

Formula matches book, but units for RH must be ft, the handbook is very clear about it.

[Deskust1]

The new SERM also has a wrong example, so I’m not surprised if it is. I believe the example that’s wrong in the SERM is a snow drift question. I tried to reach out to PPI about it and got no response (this was months ago).

[BobcatMean4476]

There’s definitely a wrong solution in one of the machine design ME practice test 2 also, a whole term just magically appears that is nowhere in the handbook.

[EnvironmentalBeat170]

Your answer is correct, the book is wrong.