Read as baseline preparation for the PE Environmental exam. I haven't taken the exam yet, but based on the myriad practice problems I've worked on since completing this book, this text will get you close to the finish line of understanding most exam concepts. Many of the problems at the end of each chapter are equal in difficulty, and often harder, than the practice exam questions I've worked. However, it contains no information regarding flows in pipes and open channels - you'll have to find a supplemental source for that.