This volume explains water hydraulics in the context of treatment plants, presenting hydraulic theory and calculations in terms of the machinery and unit operations familiar to operators. It covers hydraulics as related to keeping water moving from one unit process to the next, including maintaining proper settling times and settling velocity, and providing lift to higher elevations. The book contains the basic knowledge needed for certification, licensure, and improved job performance. It provides checkpoints, self-tests and a final examination with review questions based on actual certification exams. It is clearly illustrated with key ideas and highlighted points throughout.