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WMS Supported Models

HEC-1

CategoryTypeMethodDescription
Hydrologic Modeling 1D Lumped ParameterHEC-1 is a lumped parameter hydrologic model used for modeling single storm events. HEC-1 supports several different options for modeling rainfall, losses, unit hydrographs, and stream routing.
HEC-1

HEC-HMS

CategoryTypeMethodDescription
Hydrologic Modeling 1D/2D Lumped Parameter / Quasi-DistributedHEC-HMS is a lumped parameter/quasi-distributed hydrologic model that includes support for MODClark - a quasi-distributed hydrologic model. HEC-HMS has most of the functionality in HEC-1 and is used for modeling single or multiple storm events. It supports several different options for modeling rainfall, losses, unit hydrographs and stream routing.
HEC-HMS

NSS

CategoryTypeMethodDescription
Regression-based Hydrologic Modeling 1DRegression-based single nodeNational Streamflow Statistics (NSS) is based on USGS stream gage station data collected throughout the United States and its territories. NSS is used to determine peak flows at ungaged watersheds based on watershed properties such as area, elevation, mean annual rainfall, and other parameters.
NSS

TR-20

CategoryTypeMethodDescription
Hydrologic Modeling 1DLumped ParameterTR-20 is a hydrologic model used for computing a runoff hydrograph from a single storm event. It uses standard SCS methods to compute a hydrograph.
TR-20

TR-55

CategoryTypeMethodDescription
Urban Hydrologic Modeling 1DLumped ParameterTR-55 is a subset of the TR-20 hydrologic model. It is used to compute watershed hydrographs for small urban areas from a single storm event.
TR-55

Rational Method

CategoryTypeMethodDescription
Urban Hydrologic Modeling 1D Lumped ParameterThe Rational Method is used for computing peak flows for small urban and rural watersheds. The interface to the Rational Method includes methods for getting a hydrograph and has the capability to combine runoff from multiple basins. The interface includes two different methods for determining peak flows/hydrographs at downstream confluences.
Rational Method

MODRAT

CategoryTypeMethodDescription
Urban Hydrologic Modeling 1D Lumped ParameterModified Rational Method (MODRAT) uses a variable rainfall intensity to compute flow as well as land use and soil information to compute the runoff coefficient. The model is used for single storm events in small urban areas.
MODRAT

OC Rational

CategoryTypeMethodDescription
Urban Hydrologic Modeling1DLumped ParameterOC Rational is used to compute peak flows on small, urban watersheds less than 1 square mile in Orange County, California and includes the ability to combine runoff from multiple basins.
OC Rational

OC Hydrograph

CategoryTypeMethodDescription
Urban Hydrologic Modeling1DLumped ParameterOC Hydrograph is used to compute peak flows on watersheds greater than 1 square mile in Orange County, California.
OC Hydrograph

HSPF

CategoryTypeMethodDescription
Water Quality & Hydrologic Modeling 1D Lumped ParameterHSPF is a lumped parameter hydrologic model used for modeling short or long-term watershed quantity and quality for small or large watersheds. The model allows for simulation of hydrology and water quality in natural and man-made systems.
HSPF

EPA-SWMM

CategoryTypeMethodDescription
Storm Drain Modeling 1D n/aEPA-SWMM is a dynamic rainfall-runoff simulation model used for single events or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. The model includes tools for hydrology, stormwater, sanitary sewer and hydraulic modeling.
EPA-SWMM

HEC-RAS

CategoryTypeMethodDescription
Hydraulic Modeling 1D n/aHEC-RAS is a 1D hydraulic model used for steady and unsteady open channel flow computations. HEC-RAS includes tools for running sediment transport and water quality analyses. HEC-RAS is capable of modeling subcritical, supercritical, and mixed flow regime profiles and is able to model inline channel structures such as culverts, weirs, and bridges.
HEC-RAS

SMPDBK

CategoryTypeMethodDescription
Dam Break Hydraulic Modeling 1Dn/aSMPDBK is a hydraulic model used to simulate downstream flooding produced by a dam failure. The model has largely been replaced by the HEC-RAS dam break algorithms, though simulations can still be run using a 32-bit DOS emulator.
SMPDBK

GSSHA

CategoryTypeMethodDescription
Hydrologic, Hydraulic, and Groundwater Modeling 2D Finite DifferenceGSSHA is a 2D hydraulic model used for watershed and floodplain analysis of single events or long term studies. GSSHA includes additional capabilities for groundwater modeling, contaminant transport, sediment transport, and storm and tile drain modeling.
GSSHA

CE-QUAL-W2

CategoryTypeMethodDescription
Hydrodynamic Reservoir & Estuary Water Quality Modeling 2DFinite DifferenceCE-QUAL is a 2D hydrodynamic model used to evaluate reservoir and estuary water quality. It is primarily used to model fresh water rivers, lakes, and estuaries.
CE-QUAL-W2

HY-8

CategoryTypeMethodDescription
Culvert Analysisn/an/aThe HY-8 model is used to determine the upstream headwater depth and culvert barrel flow profile for a variety of different culvert configurations. The HY-8 wizard in WMS is used to delineate a watershed upstream from a culvert, compute a hydrograph, and determine the inundated area behind a culvert from an HY-8 analysis.
HY-8

Hydraulic Toolbox

CategoryTypeMethodDescription
Hydraulic & Hydrologic Modelingn/an/aThe Hydraulic Toolbox includes a number of calculators used to analyze channels, weirs, gutters and inlets, detention basins, and particle gradations. The Hydraulic Toolbox also includes Rational Method hydrologic analysis tools.
Hydraulic Toolbox

EPANET

CategoryTypeMethodDescription
Water Distribution Modelingn/an/aEPANET is a widely used water distribution model developed by the US Environmental Protection Agency. WMS now supports reading and editing existing EPANET models as well as reading GIS data files and mapping attributes to the EPANET model attributes.
EPANET