Autodesk has made available to its subscription customers an extension to exchange data between AutoCAD Civil 3D and HEC RAS users. This extension imports and exports HEC RAS .geo files containing stream design information for flood analysis. Simply export the .geo file out of
Civil 3D 2009 and import it into HEC-RAS. With the flood analysis complete, import the data from HEC-RAS back into
Civil 3D 2009. Profile data is imported and surface objects can be created from the imported data.
About AutoCAD Civil 3DAutoCAD Civil 3D software provides a better surveying, design, analysis and documentation solution for civil engineering, including land development, transportation and environmental projects.
About HEC-RASHEC RAS stands for Hydrologic Engineering Center’s River Analysis System. HEC-RAS performs 1-D analysis for
1. steady flow water surface profile computationsThe system can handle a full network of channels, a dendritic system [a main river with tributaries with their own tributaries.], or a single river reach. The steady flow component is capable of modeling subcritical, supercritical, and mixed flow regimes water surface profiles.
Computations are used for multiple plan analyses; multiple profile computations; multiple bridge and/or culvert opening analyses; and split flow optimization.
2. unsteady flow simulationit does 1D unsteady flow simulation for flow through a full network of open channels.
Simulation is used for dam break analysis; levee breaching and overtopping; Pumping stations; navigation dam operations; and pressurized pipe systems.
3. movable boundary sediment transport computationsit does 1-D sediment transport/movable boundary calculations resulting from scour and deposition over moderate time periods.
The model is designed to simulate long-term trends of scour and deposition in a stream channel that might result from modifying the frequency and duration of the water discharge and stage, or modifying the channel geometry. This system can be used to evaluate deposition in reservoirs, design channel contractions required to maintain navigation depths, predict the influence of dredging on the rate of deposition, estimate maximum possible scour during large flood events, and evaluate sedimentation in fixed channels.
4. water quality analysis
This component of the modeling system is intended to allow the user to perform riverine water quality analyses. The available water quality constituents are: Dissolved Nitrogen (NO3-N, NO2-N, NH4-N, and Org-N); Dissolved Phosphorus (PO4-P and Org-P); Algae; Dissolved Oxygen (DO); and Carbonaceous Biological Oxygen Demand (CBOD).
About Dendritic System!In a dendritic system there is one main river (like the trunk of a tree), which is joined and formed by many smaller tributary rivers.