Overfilled Storage

[ugfest]

I have a catch basin discharging into a stone trench through a pipe. The trench is sized for the 2 year storm. Any greater storm is supposed to fill the trench and then overflow through the top of the catch basin. Is there a way to set a maximum elevation in the trench so that once the elevation is reached, it will overflow the top of catch basin. Or maybe another way to model this.
Thanks

 

[psmart]

The easy solution is to model the CB+Trench as a single pond. The storage would consist of the stone-filled trench (primatoid with appropriate voids), and perhaps a vertical cylinder for the CB storage. You can use a horizontal orifice or weir for the CB overflow, and perhaps exfiltration for the trench.


Peter Smart
HydroCAD Software

http://www.hydrocad.net

 

[ugfest]

Thanks for the info.