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Culverts
Culverts are the same as bridges as far as locating cross sections
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2. Culvert Types in HEC-RAS
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3. Cross Section Locations
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4. Typical Culvert Profile
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5. Culvert Flow Types
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6. Culverts Inlets and Outlets
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7. Culvert Inlets and Outlets
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8. Culvert Inlets and Outlets
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9. 11/20/2018
Culvert Modeling Expansion and Contraction Coefficients at the 4 cross-sections for a culvert (example)
Expansion Contraction
Cross-Section 4 (furthest US)
Cross-Section
Cross-Section
Cross-Section 1(furthest DS)
Shows typical expansion and contraction coefficients at culverts versus normal cross sections.
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10. Ineffective Flow Areas
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11. Adding the Culvert(s) 11/20/2018 11/20/2018
Solution criteria has the options of selecting inlet or outlet control or letting the program compute both and select highest HW. Culvert ID is simply a name you give the culvert.
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12. Input Requirements for Culverts
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Culvert ID
Solution criteria (inlet, outlet, or highest energy grade line)
Shape (circular, box, arch, etc.)
Dimensions (diameter, width, etc)
FHWA chart # (pages 6-25,26 of hydraulic reference manual)
FHWA scale (same table as chart #)
Distance to upstream cross section
Solution criteria has the options of selecting inlet or outlet control or letting the program compute both and select highest HW. Culvert ID is simply a name you give the culvert.
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13. Input Requirements for Culverts (Continued)
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Length
Entrance loss coefficient (tables 6.3 and 6.4 of hydraulic reference manual)
Exit loss coefficient (0.3 to 1)
Manning’s ‘n’ value (tables 6.1 and 6.2 of hydraulic reference manual)
U. S. And D.S. invert elevations
Centerline stations in relation to U. S. And D. S. cross sections
Exit loss coefficients are usually assumed to be 1 or close to 1. The higher the number the more loss there is. Table 6.1 of HRM gives Manning's 'n' values for culverts.
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14. Input Requirements for Culverts Roadway Data
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Input Requirements for Culverts Roadway Data
Roadway width
Distance to U.S. Cross section
Weir coefficient
Station - elevation points
This distance to U.S. cross section is different than the one on the previous slide. This is distance to top of edge of roadway.
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15. Adding the Culvert(s)
Select the Brdg/Culv button from the geometry data window:
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16. Adding the Culvert(s) This brings up the Bridge Culvert Data window:
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17. Adding the Culvert(s)
From the options menu, select “Add a Bridge and/or Culvert”:
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18. Adding the Culvert(s)
This brings up a window asking for the river station of the bridge. It will locate the bridge numerically between cross-sections:
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19. Adding the Culvert(s)
This brings up a window with the adjacent upstream and downstream cross-sections plotted:
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20. Adding the Culvert(s)
Next, select the Deck/Roadway button from the Bridge data window:
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21. Adding the Culvert(s)
Notice the weir coefficient and max submergence window are showing the default values:
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22. Cross Section Locations
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23. Adding the Culvert(s)
Enter the data for the required values. Note that the U.S. and D.S. sideslopes are for cosmetic purposes only unless using the WSPRO method for low flow. Also note the zeroes for the low chord:
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24. Adding the Culvert(s)
After selecting OK from the bridge deck window, it replots the U.S. and D.S. x-sections showing the filled in road section:
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25. Adding the Culvert(s)
After selecting OK from the bridge deck window, it replots the U.S. and D.S. x-sections showing the filled in road section:
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26. Adding the Culvert(s)
To enter the culvert data, first select the Culvert button:
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27. Adding the Culvert(s) This brings up the Culvert Data Editor window:
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28. Adding the Culvert(s) Enter the data and select OK ...
Table 6.3 or 6.4, HRM
Table 6.1 or 6.2, HRM
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29. Adding the Culvert(s) The plot is then updated to show the culvert:
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30. 11/20/2018
The End
Culverts are the same as bridges as far as locating cross sections
11/20/2018