The Reservoir System Simulation (HEC-ResSim) software developed by the U.S. Army Corps of Engineers, Institute for Water Resources, Hydrologic Engineering Center (CEIWR-HEC) is used to model reservoir operations at one or more reservoirs for a variety of operational goals and constraints. The software simulates reservoir operations for flood management, low flow augmentation and water supply for planning studies, detailed reservoir regulation plan investigations, and real-time decision support. HEC-ResSim can represent both large and small scale reservoirs and reservoir systems through a network of elements (junctions, routing reaches, diversions, reservoirs) that the user builds. The software can simulate single events or a full period-of-record using available time-steps.
HEC-ResSim is used as decision support tool for modelers performing reservoir project studies as well as meeting the needs of reservoir regulators during real-time events.
HEC-ResSim is the successor to HEC-5, Simulation of Flood Control and Conservation Systems" (HEC, 1998). HEC-ResSim is composed of a graphical user interface (GUI), a computation engine (to simulate reservoir operations), data storage and management capabilities, and plotting and reporting facilities. HEC-DSS, the Hydrologic Engineering Center's Data Storage System, (HEC, 1995 and HEC, 2009) is used for storage and retrieval of input and output time-series data.
The following sections contain more introductory information about HEC-ResSim.