I was looking for a book that would be a good introduction to created wetlands, particularly treatment wetlands - something a little less massive than the recent tome by Kadlec and Wallace. This book wasn't what I was looking for. Although it covered the basics, (and had lots of design diagrams) the organization of the book is awful. It looks like the author just shoved a bunch of power-point presentations together and got it published. Even the numerous diagrams weren't much use, as most of them lacked information on scale and virtually all of them lacked information on loading rates, hydrology, etc. The theoretical considerations presented are also presented in such a general way as to be pretty much useless. There are a lot of case studies in the book, but I didn't get around to reading them. Overall, this book was light on the "principles" mentioned in the title. It might be worth $30, but I'm not convinced.