hec-georas on a small stream in north branch, clear creek
DESCRIPTION
HEC-GEORAS on a small stream in North Branch, Clear Creek. Zhihao Wang Sep 2011. HEC-RAS perform one-dimensional steady and unsteady flow river hydraulics calculations HEC- GeoRAS pre- and/or post-process GIS data and HEC-RAS results for flood inundation mapping using ArcGIS . - PowerPoint PPT PresentationTRANSCRIPT
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HEC-GEORAS on a small stream in North Branch,
Clear CreekZhihao Wang
Sep 2011
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HEC-RAS◦perform one-dimensional steady and unsteady
flow river hydraulics calculations
HEC-GeoRAS◦pre- and/or post-process GIS data and HEC-RAS
results for flood inundation mapping using ArcGIS
![Page 3: HEC-GEORAS on a small stream in North Branch, Clear Creek](https://reader036.vdocument.in/reader036/viewer/2022062323/5681610c550346895dd05dc0/html5/thumbnails/3.jpg)
HEC-GeoRAS creates a file of geometric data for import into HEC-RAS, and enables viewing of exported results from RAS.
Pre-process
Post-process
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TIN of part of the North branch, Clear Creek
HEC-GeoRAS requires a DTM (digital terrain model) in the form of TIN or GRID.
![Page 5: HEC-GEORAS on a small stream in North Branch, Clear Creek](https://reader036.vdocument.in/reader036/viewer/2022062323/5681610c550346895dd05dc0/html5/thumbnails/5.jpg)
30mDEM
8mDEM, 23m z tolerance
8mDEM, 1m z tolerance
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Flow rate generated by GeoWEPP (referred to as runoff)
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Create RAS layers: ◦Stream centerlines, Banks, Flow paths, Cross
section cutlines, other optional layers◦By creating empty layers and digitize manually
Stream centerlines
Banks
Flow paths
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Cross section cutlines
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Assign attributes to:◦Stream centerlines (names, topology, length)◦Flow paths (left/right/center)◦Cross section cutlines (river/reach name, bank
stations, elevation…)
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Manning’s value
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Extract GIS data HEC-RAS geometric data
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Cross section view in HEC-RAS
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Set up the flow rate data
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2-year scenario simulation results
Conventional tillage
Conservation tillage
No tillage
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