In recent years, the field of hydrology has been transformed as GIS technology is increasingly used to model and analyze the dynamic hydrology at work on the planet. "Arc Hydro: GIS for Water Resources" is the definitive book on the Arc Hydro Data Model, a sophisticated template designed to help hydrologists and scientists from other disciplines develop data models in their own areas of study. This book contains instructions for using Arc Hydro, a set of tools that populate the attributes of the features in the data framework, slide show resources for teachers, and sample data from the Guadalupe River basin in Texas to which you can apply the tools.