Welcome to the Hydrologic Engineering Center's (CEIWR-HEC) River Analysis System (HEC-RAS) website. This software allows the user to perform one-dimensional steady flow, one and two-dimensional unsteady flow calculations, sediment transport/mobile bed computations, and water temperature/water quality modeling.
The purpose of this website is to enhance the support services provided to HEC-RAS customers. The HEC-RAS website provides a number of resources, which include helping the user download software, learn how to use
HEC-RAS, resolve problems, report bugs, and suggest improvements to CEIWR-HEC products and service. Unfortunately, CEIWR-HEC is unable to provide phone or email technical support to non-USACE customers. However, CEIWR-HEC does encourage anyone who finds an issue with CEIWR-HEC software, to please report
Phone: (530) 756-1104
Crayfish is a plugin (extension) developed by Lutra Consulting for the free and open source GIS platform QGIS.
The Crayfish plugin aspires to be a time explorer for structured and unstructured mesh and vector datasets within QGIS. With Crayfish, users can load time varying mesh into QGIS. It currently supports several meteorology, hydrology and oceanography file formats.
Currently, Crayfish supports a number of file formats: NetCDF, GRIB, XMDF, XDMF, FLO-2D, Selafin files, SMS DAT and SWW. Examples of the software packages are: Weather Research and Forecasting Model (WRF), TUFLOW, AnuGA, BASEMENT, Flood Modeller 2D, HECRAS 2D, FLO-2D, TELEMAC and Hydro_AS 2D.
Crayfish also allows user to view NetCDF and GRIB files directly in QGIS. In the example below, global temperature dataset (GRIB fromat) can be seen in QGIS.
Phone: +44 (0)1444 848012
Kalypso is an open source modeling system for numerical simulations in water management. With Kalypso, you develop flood protection concepts and calculate flood hazard and flood risk maps – tasks which are currently of great relevance and are, inter alia, prescribed by EU Floods Directive 2007/60/EC.
Along with providing standard functions for hydrological and hydraulic simulation, Kalypso is distinguished by its modular design and modern, operator-friendly user interfaces. Our Kalypso tools assist you in creating the model and support a varied analysis of the results.
Besides including standard functionality for hydrological and hydraulic simulation processes, Kalypso is equipped with a modern and user friendly graphical user interface containing a multitude of efficient tools which provide means for generating models (preprocessing) and easily analyze model results (post-processing) according to the users’ requirements. Kalypso is comprised of several modules which utilize a common data basis.
Phone: Not available
Title: Flood Modeller Free
Flood Modeller Free provides the same user-friendly interface and industry-leading solvers as Flood Modeller Pro for building and running smaller models. It provides 250 1D nodes and 100,000 2D cells at no cost, allowing you to upgrade as and when your project evolves.
Phone: +44 (0)845 094 7994
Title: Storm Water Management Model (SWMM)
EPA's Storm Water Management Model (SWMM) is used throughout the world for planning, analysis and design related to stormwater runoff, combined and sanitary sewers, and other drainage systems in urban areas. There are many applications for drainage systems in non-urban areas as well.
SWMM is a dynamic hydrology-hydraulic water quality simulation model. It is used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. The runoff component operates on a collection of sub catchment areas that receive precipitation and generate runoff and pollutant loads. The routing portion transports this runoff through a system of pipes, channels, storage/treatment devices, pumps, and regulators.
SWMM tracks the quantity and quality of runoff made within each sub catchment. It tracks the flow rate, flow depth, and quality of water in each pipe and channel during a simulation period made up of multiple time steps. SWMM 5 has recently been extended to model the hydrologic performance of specific types of low impact development (LID) controls. The LID controls that the user can choose include the following seven green infrastructure practices:
- Permeable pavement
- Rain gardens
- Green roofs
- Street planters
- Rain barrels
- Infiltration trenches
- Vegetative swales
The updated model allows engineers and planners to accurately represent any combination of LID controls within a study area to determine their effectiveness in managing stormwater and combined sewer overflows.
Delft3D is a world leading 3D modeling suite to investigate hydrodynamics, sediment transport and morphology and water quality for fluvial, estuarine and coastal environments. As per 1 January 2011, the Delft3D flow (FLOW), morphology (MOR) and waves (WAVE) modules are available in open source.
The software is used and has proven his capabilities on many places around the world, like the Netherlands, USA, Hong Kong, Singapore, Australia, Venice, etc. The software is continuously improved and developed with innovating advanced modelling techniques as consequence of the research work of our institute and to stay world leading.
The FLOW module is the heart of Delft3D and is a multi-dimensional (2D or 3D) hydrodynamic (and transport) simulation programme which calculates non-steady flow and transport phenomena resulting from tidal and meteorological forcing on a curvilinear, boundary fitted grid or sperical coordinates. In 3D simulations, the vertical grid is defined following the so-called sigma coordinate approach or Z-layer approach. The MOR module computes sediment transport (both suspended and bed total load) and morphological changes for an arbitrary number of cohesive and non-cohesive fractions. Both currents and waves act as driving forces and a wide variety of transport formulae have been incorporated. For the suspended load this module connects to the 2D or 3D advection-diffusion solver of the FLOW module; density effects may be taken into account. An essential feature of the MOR module is the dynamic feedback with the FLOW and WAVE modules, which allow the flows and waves to adjust themselves to the local bathymetry and allows for simulations on any time scale from days (storm impact) to centuries (system dynamics). It can keep track of the bed composition to build up a stratigraphic record. The MOR module may be extended to include extensive features to simulate dredging and dumping scenarios.
For over 30 years Deltares has been in the forefront of these types of combined morphological simulation techniques.
Phone: +31 (0)88 335 8100