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PURPOSE: The objective of this document is to describe the Hydrologic Engineering Center’s Hydrologic Modeling System (HEC-HMS) program and its application to watershed studies. HMS has the capability to serve as a cornerstone program with respect to the watershed perspective approach. HMS can simulate the rainfall-runoff at any point within a watershed given physical characteristics of the watershed. It is a tool for watershed management in that an HMS model can be developed to account for human impact to determine the effect on the magnitude, quantity, and timing of runoff at points of interest. Results from an HMS model can be used by a number of other programs to determine impact in areas such as water quality and flood damage. MODEL DESCRIPTION Overview. The Hydrologic Modeling System is designed to simulate the precipitation-runoff processes of dendritic watershed systems. It is applicable in a wide range of geographic areas for solving the widest possible range of problems. This includes large river basin water supply and flood hydrology, and small urban or natural watershed runoff. Hydrographs produced by the program are used directly or in conjunction with other software for studies of water availability, urban drainage, flow forecasting, future urbanization impact, reservoir spillway design, flood damage reduction, floodplain regulation, wetlands hydrology, and systems operation. HMS features a completely integrated work environment including a database, data entry utilities, computation engine, and results reporting tools. A graphical user interface allows the user seamless movement between the different parts of the program. Program functionality and appearance are the same across all supported platforms. Time-series, paired, and gridded data are stored in the Data Storage System HEC-DSS (U.S. Army Corps of Engineers (USACE) 2003). Storage and retrieval of data are handled by the program and are generally transparent to the user. Precipitation and discharge gauge information can be entered manually within the program or can be loaded from previously created DSS files. Results stored by the program in the database are accessible by other HEC software. Data entry can be performed for individual basin elements such as subbasins and stream reaches or simultaneously for entire classes of similar elements. Tables and forms for entering necessary data are accessed from a visual schematic of the basin. All computations are performed in metric units. Input data and output results may be U.S. customary or metric and are automatically converted when necessary.

Description of the Hydrologic Engineering Center's Hydrologic Modeling System (HEC-HMS) and Application to Watershed Studies