![]() Routing with no attenuation can be modeled with the lag method. The nonlinear Boussinesq method provides a response similar to the recession method but the parameters can be estimated from measurable qualities of the watershed.Ī total of six hydrologic routing methods are included for simulating flow in open channels. The linear reservoir method conserves mass by routing infiltrated precipitation to the channel. The constant monthly method can work well for continuous simulation. The recession method gives an exponentially decreasing baseflow from a single event or multiple sequential events. An implementation of the kinematic wave method with multiple planes and channels is also included.įive methods are included for representing baseflow contributions to subbasin outflow. The modified Clark method (ModClark), is a linear quasi-distributed unit hydrograph method that can be User-specified unit hydrograph or s-graph ordinates can also be used. Unit hydrograph methods include the Clark, Snyder, and SCS techniques. Seven methods are included for transforming excess precipitation into surface runoff. ![]() Canopy and surface components can also be added when needed to represent interception and capture processes. Gridded methods are available for the deficit constant, Green Ampt, SCS curve number, and soil moisture accounting methods. Used for continuous modeling of complex infiltration and evapotranspiration environments. ![]() The three-layer soil moisture accounting method can be The one-layer deficit constant method can be used for simple continuous modeling. Options for event modeling include initial constant, SCS curve number, exponential, Green Ampt, and Smith Parlange. Computation proceeds from upstream elements in a downstream direction.Īn assortment of different methods is available to simulate infiltration losses. Available elements are: subbasin, reach, junction, reservoir, diversion, source, and sink. Hydrologic elements are connected in a dendritic network to simulate runoff processes. The physical representation of a watershed is accomplished with a basin model. HEC HMS FOR MAC SOFTWARESimulation results are stored in HEC-DSS (Data Storage System) and can be used 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, and systems operation. A graphical user interface allows the user seamless movement between the different parts of the software. The software features a completely integrated work environment including a database, data entry utilities, computation engine, and results reporting tools. ![]() Supplemental analysis tools are provided for parameter estimation, depth-area analysis, flow forecasting, erosion and sediment transport, and nutrient water quality. Advanced capabilities are also provided for gridded runoff simulation using the linear quasi-distributed runoff transform (ModClark). HEC-HMS also includes procedures necessary for continuous simulation including evapo-transpiration, snowmelt, and soil moisture accounting. The software includes many traditional hydrologic analysis procedures such as event infiltration, unit hydrographs, and hydrologic routing. The Hydrologic Modeling System (HEC-HMS) is designed to simulate the complete hydrologic processes of dendritic watershed systems. ![]()
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