Bypass Storm Sewer Flowing Through Outlet Structure
Bypass Storm Sewer Flowing Through Outlet Structure
(OP)
I have a situation where I am connecting an detention basin outlet structure to an existing storm sewer. The existing storm sewer is capturing offsite area that is bypassing the detention basin. I am worried about the existing storm sewer surcharging and backing up into my basin through the outlet structure in large storms. Currently I have the basin modeled with orifice outlets that are routed to a CB that is the existing storm sewer. The offsite runoff watershed also enters the existing storm sewer CB. Is this correct? Running with the Dyn-Stor-Inds will make sure tailwater is accounted for, but what about overflowing out of my outlet structure into my basin? Should I use a Sim-Route model with a reverse flow from the basin to the CB? I'm worried Sim-Route will not work with the CB. Thanks for any help you can provide





RE: Bypass Storm Sewer Flowing Through Outlet Structure
RE: Bypass Storm Sewer Flowing Through Outlet Structure
RE: Bypass Storm Sewer Flowing Through Outlet Structure
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Bypass Storm Sewer Flowing Through Outlet Structure
RE: Bypass Storm Sewer Flowing Through Outlet Structure
But before you attempt to model this, make sure the reverse flow will actually be allowed by your stormwater regulations. If the timing of the sewer fills your pond early in the storm, you won't have any volume available for peak management of your on-site flow.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Bypass Storm Sewer Flowing Through Outlet Structure
RE: Bypass Storm Sewer Flowing Through Outlet Structure
I'm less than a year in to learning HydroCAD, but as I understand it, what you want to do is use Sim-Route, make sure you don't have any oscillations, and make your catch basin a very small storage node so that HydroCAD processes the reverse flow properly. Is that correct, Peter?
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Bypass Storm Sewer Flowing Through Outlet Structure
Peter Smart
HydroCAD Software
www.hydrocad.net