Hydrocad - Bypass Flows
Hydrocad - Bypass Flows
(OP)
I am modelling a detention basin, but only the Q1 and Q2 flows enter the tank, all other storm events (eg Q5, Q10, Q20, Q50 and Q100) go overland and discharge directly into the creek. This would mean that the Q1 and Q2 needs to be stored longer to acount for the higher storm events.
Is there anyway to input this senario into the Hydrocad program?
Thanks
Richard
Is there anyway to input this senario into the Hydrocad program?
Thanks
Richard





RE: Hydrocad - Bypass Flows
Assuming it's an overflow of some type, you would use an overflow device and set the routing to secondary. This will let you route that portion of the flow to the creek.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Hydrocad - Bypass Flows
Where we are proposing the detention basin is slightly higher than the rest of the site, we can discharge the pipes (which are design for Q1 and Q2 flows) into the basin but not the overland flows, these flows will discharge into the creek.
The reason for proposing the detention basin in this slightly higher area is due to site constraints.
Richard
RE: Hydrocad - Bypass Flows
I assume everything enters the tank until it fills up? If this is the case, you can use an overflow device to route the excess.
On the other hand, if the overland flow always goes to the creek, just route it there to begin with.
If you have further questions, a sketch would be helpful.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Hydrocad - Bypass Flows
Attached diagram which shows my question and another diagram but not sure if this will work, I hope it helps.
The stormwater pipes only have the capacity to carry Q1 and Q2 flows, all other storm event flows is forced to travel overland.
Thanks
Richard
RE: Hydrocad - Bypass Flows
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Hydrocad - Bypass Flows
Remember there will always be some flow through the "stormwater pipes", even in the larger events. The exact flow will be a function of the pipe parameters and the headwater generated at the flow splitter.
This is a very common diversion scenario, and doesn't require anything special on your part other than using the primary/secondary device routing.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Hydrocad - Bypass Flows
I made the changes and it seems to work.
Thanks for your help.
Richard