In order to increase the accuracy of a simulation and to add more detail to a hydrologic model, 1-D hydraulic channels can be added to a previously constructed GSSHA model. To include stream flow in the GSSHA model, do the following.
| 1. Define channel geometry.
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- Create the stream arcs.
- Set the stream arcs to a GSSHA stream arc type.
- Open Attributes... under the Feature Objects menu and enter the necessary data.
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| 2. Smooth the channel thalweg elevations.
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- Redistribute the vertices along the stream arcs.
- Use Smooth Stream/Pipe Arcs... under the GSSHA menu.
- Interpolate the stream elevations as many times as needed to create a smooth stream segment with no uphill flow.
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| 3. Change the output control options.
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- Use the GSSHA Job Control Parameters dialog to change the output control.
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| 4. Run the GSSHA model.
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- Run the GSSHA simulation.
- Select a hydrograph to view the hydrograph plot.
- A spreadsheet will have been generated outside of WMS after running the simulation, which can be viewed in an external spreadsheet program.
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