AutoCAD Civil 3D - Stormwater

Posts: 4
Registered: ‎10-27-2012
Message 1 of 3 (342 Views)
Accepted Solution

Hydraflow Express Culverts - Negative Invert Elevation

342 Views, 2 Replies
10-27-2012 04:03 PM

I am analysing a culvert in a tidal zone which has an outlet invert level below the normal tidal range. The invert level of the culvert outler is -0.520m, however Hydraflow Express Culverts will not allow a negative invert elevation to be entered.

Does anyone know a way around this?.



Lar Hughes


Posts: 2,909
Registered: ‎05-13-2005
Message 2 of 3 (329 Views)

Re: Hydraflow Express Culverts - Negative Invert Elevation

10-29-2012 06:36 AM in reply to: iepms

Lars -


The workflow would be to move the datum up such that 0 m is now 10m and all of the elevations are postive.


It would be advisable to use Autodesk Storm and Sanitary Analysis for tidal culverts.  It does not have the negative elevation limitation and can adequately solve tidal culverts with flap gates.

Matthew Anderson, PE
Product Manager
Posts: 4
Registered: ‎10-27-2012
Message 3 of 3 (320 Views)

Re: Hydraflow Express Culverts - Negative Invert Elevation

10-29-2012 04:51 PM in reply to: Matt.Anderson



Thank you very much for your reply. I will try and model this culvert in SSA. Do you know if SSA will output similar results for a culvert as Hydraflow Express - i.e. HGL's, Hw Elevation, Hw/D, results schematic and wheter the culvert flow regime is inlet or outlet control.





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