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If you have this book, I could really use help resolving some issues with their solutions. I have edition 1, printing 1 and have added in the errata from the PPI site. In the solution to problem 38, 2nd paragraph on page 49: they state that the change in head for both layers of soil is...

I was able to find the pre and post development 2-year peak discharge values, but got lost where he calculates the increased upland runoff depth for the two year storm using: (delta)Q=Q2-(qu1/qu2)Q1 = 1.13in. What was the point of calculating the qp values, and why is that ratio of the unit...

Problem # 13 in 6-Minute Solutions Geotechnical describes a square footing on clayey-sand, and asks to solve for qult using the Terzaghi-Meyerhof equation. In the CERM (11th) it states that this equation (36.1) is appropriate for a foundation in a continuous wall footing, and that shape factor...