Engineers and scientists work to secure water supplies for potable and agricultural use. They evaluate the water balance within a watershed and determine the available water supply, the water needed for various needs in that watershed, the seasonal cycles of water movement through the watershed and they develop systems to store, treat and convey water for various uses. This book presents current research in the study of water engineering including the methods and approaches of groundwater investigation, development and management; industrial wastewater treatment using cavitational reactors and the Fenton process; acquifer characterization using slug tests; water cluster ion beam processing and sustainable water engineering for vulnerable communities in Colombia.