There is an increasing awareness that water resources exist in limited quantities, and available supply varies considerably during the course of a year. As a result, there is an urgent need to find ways of saving, reusing and recycling water and to develop methodologies to improve water resource management. One long-term strategic goal advocated by several authorities is developing a stable supply of water throughout the year. This goal is consistent with a change in water resources management, which traditionally focused on supply-side policies. In fact, from the 1970s a movement toward demand-control policies has been challenging the expansion of supply capacity to meeting growing needs (Hiessel, 2002). The simultaneous emergence of these goals and paradigms of sustainable water management facilitates the development of constructive applications of new technologies to address these issues.