During the past decade many countries in the world have experienced droughts, with severe impacts on water urban supply systems. Because droughts are natural phenomena, water utilities must design and implement drought management plans. These proceedings deal with the management plans. The contributions in this book have been presented in four sections: Water supply systems; modernization; drought management in an urban context; and practical cases (Israel, USA, Italy, Spain). To achieve a well-balanced approach, authors were invited from academia as well as from consultancies and water utilities.