Sedimentation is today's challenge being faced by the engineers around the world. Reducing reservoir capacity, the sedimentation process is threatening availability of water for Irrigation, drinking, power generation and other purposes. The menace needs to be checked to enhance the chances of fresh water supplies for our next generations. Sooner or later, the world will be facing crises of acute water shortage for which it is prime time to understand the root cause and plan remedy for this crises. This book provides an understanding of sedimentation process occurring in small reservoirs of Barrages, Weirs and other impounding structures in easy to understand language explaining the subject with a detailed case study of Ghazi Barotha Barrage reservoir situated in KPK province of Pakistan including results of a mathematical model DIFAS (Depth Integrated Flows and Sediments) used by the designers of the Project, for comparison of actual and conceived sedimentation pattern.