Chapter1: Extensive updates and changes, and completely rewritten with a more introductory coverage of topics, including simple rainfall runoff and hydrograph analysis with new examples and completely revised homework problems. Chapter 2: Coverage of the unit hydrograph and includes hydrologic losses such as evaporation and infiltration. New examples have been added on Green and Ampt infiltration, as well as many additional homework problems. Chapter 4: Expanded coverage and new examples on flood routing. Many of the older numerical schemes have been simplified or removed, and new homework problems have been added to streamline the chapter. Chapter 5 : Presents updated methods for simulating rainfall and runoff, flood hydrograph prediction, and flood control options in a watershed. New models are highlighted with new examples and a new detailed case study, including flood control alternatives. All new homework problems have been written as well. Chapter 12: Reviews the new emerging trends in flood control methods and floodplain management, a vital topic given the recent storm events in the United States, such as Hurricane Irene in the northeast. A detailed discussion of massive hurricane impacts along the Gulf Coast, including Hurricane Katrina and Ike, two of the most damaging hurricanes in history. Chapter 13: Brand new and includes emphasis on the San Antonio River and Edwards Aquifer System in Central Texas, the Colorado River Basin system, and the Thames River in England. The chapter also briefly highlights international water issues in China and Southeast Asia. The chapter ends with a discussion of the changing global condition and the need for sustainable interaction between human and natural systems.