beej67
Civil/Environmental
- May 13, 2009
- 1,976
I've got 500 feet of shallow box culvert with which I intend to convey low storms, and want to provide extra capacity above it in the form of a trapezoidal overflow channel. I would like to enter the culvert and the overflow channel both into the Outlets dialog of a no-storage pond node in HydroCAD, but there is no option for the channel.
I thought I might make a dummy weir of arbitrarily large width with capacity in excess of the channel capacity, and route the discharge from that weir to the channel as a secondary discharge, then rely on the elevation in the channel to dictate the head at the node. It doesn't seem to be working.
Are the routines for trapezoidal channels in reach nodes in HydroCAD robust enough to do what I'm doing? Or would I need to do something else? Can I be confident in my results if I approximate the overflow as a broad crested weir?
My application may be pushing the boundaries of the software, and I'd like some guidance on exactly how far I can confidently push them.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East -
I thought I might make a dummy weir of arbitrarily large width with capacity in excess of the channel capacity, and route the discharge from that weir to the channel as a secondary discharge, then rely on the elevation in the channel to dictate the head at the node. It doesn't seem to be working.
Are the routines for trapezoidal channels in reach nodes in HydroCAD robust enough to do what I'm doing? Or would I need to do something else? Can I be confident in my results if I approximate the overflow as a broad crested weir?
My application may be pushing the boundaries of the software, and I'd like some guidance on exactly how far I can confidently push them.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East -