Hydraflow Hydrographs Extension for C3D 2009

[cenc]

I am modeling a wetpond with two forebays, not in series. I've read through the User's Guide and did not see how I should input my values. If someone can provide some assistance, it would be greatly appreciated.

This is an existing pond, so I have the as-builts and created my pond with contours. I set the bottom of the pond at the NWSE, stage 0, with the final stage being the top of the embankment around the pond.

For culvert A out of the riser, the actual invert is lower than what I show for the pond bottom due to using NWSE. How should I represent culvert A invert, actual invert or at NWSE?

For contour area, should I include the forebays as well? The NWSE is higher than the berm between the forebays and main pond.

Thanks.

 

[francesca]

If the culvert is at the bottom of a riser, your outlet is a weir at the top of the riser, not a culvert. You need to include all storage above the NWSE.

 

[cenc]

Thank you francesca.

Culvert A is the pipe out of the riser.
Culvert B is pipe into riser.
Weir A is top of riser.

Wasn't sure if I should place culvert A invert at actual invert (which would be an elevation below what I show the pond bottom to be, since I created the pond with a pond bottom at the NWSE) or input the invert into Hydraflow at the NWSE.

For example:
actual pond bottom = 100
NWSE = 105
Culvert A out of riser invert = 100
Culvert B = 105
Top of riser 108
When I create a pond in Hydraflow, do I list the pond bottom to be 105? If so, what should i input culvert A invert as? Or, does it matter.