I don't know this book, but I have met Nabhan, read one of his other books (The Desert Smells Like Rain), and visited the site of his project in Patagonia Az back in 2004. If this book is anything like his previous work and projects then it is very worthwhile.
The book "Growing Food in a Hotter, Drier Land" by Gary Paul Nabhan
In permaculture terms from the PDC this would be one of the basic principles of water usage: Slow it down, spread it out, and soak it in. Generally the longer you can have the water stay on your property and soak deep into your soils, and be utilized by plants, the better.
I would like the flash flood water in the wadi to be an inch deep and 60 feet wide, rather than a foot deep and 5 feet wide. Much of my work in the wadi, is designed to spread a shallower flow across a wider surface area.
Baruch Kogan wrote:To go from the highest terrace to my project would mean building about 400 meters worth of terrace.