AutoCAD Civil 3D - Stormwater

[#1]

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?.

Regards

Lar Hughes

[#2 · Accepted solution]

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.

[#3]

Matt

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.

Thanks

Lar