The establishment of the scheme which could be managed the national reservoir efficiently and consideration of a variable management scheme by the application of a new technique for it is very important for the improvement of national service quality and application of related techniques. In this study, sediment information which was accumulated in the reservoir for a long time and occasioned the decrease of pondage and increase of water pollution was constructed rapidly and accurately using GPS, sub bottom profiler and echo sounder. And the calculation system of sediment was efficiently designed through the applications of 2D and 3D spatial information processing techniques. As a results, the calculation system of sediment which was accomplished a various functions was developed and a basic information of management for the reservoir which was constructed quite a while ago was presented.