This series of five volumes focused on environmental hydraulics studies the complete water (or hydrologic) cycle from meteorology to coastal morphodynamics, including looking at river hydraulics, hydrogeology and marine hydraulics. It describes these physical processes, and how they are observed in the real world, from catchment basins or watersheds where precipitation first falls, all the way through the transport of water to the sea. An inventory of ground measurement instruments, which provide necessary input data for the various modeling tools described in the book, is drawn up, and mathematical models describing each field within the overall subject area are detailed by a series of system equations. These are then solved by the use of numerical methods adapted to the particular characteristics of the application in question.Many of the key modeling tools used by engineers in practice in the field are described in detail, as well as numerous examples of the application of the methods to real world problems, presented as case studies that highlight all of the processes described above.Volume 3 focuses on the main numerical methods used in each major scientific field within the discipline to translate mathematical models into numerical tools, and hence to solve the problems posed by real-world scenarios.