Hydraflow Hydrographs - how to model underground chambers

[kirstenmhanson]

Hi all.  I am new to Hydrographs and am modeling a system with underground chambers (StormTech SC-310).  It seems that when the discharge exceeds the storage provided, the system won't provide any results and I get the message "Maximum elevation exceeded the top of pond.  Reservoir storage or discharge may be too small."  I have added an emergency spillway because I want to know what the peak discharge rate is one the chambers are full, but the discharge rate seems to vary depending on the width.  If I make the spillway very wide, even if it's set above the top of the chambers, it seems like my discharge is just exiting and not filling up the chambers first.  Any ideas??

[Mike_Hurtado]

Any chance you can share a model with us so that we can take a look? If you'd rather not post it publicly, feel free to PM me a download link.

[ABELLAA]

Hi! Do you have the steps to go by in modelling an underdrain system like a bioretention in hydraflow? Thanks, aa.

[brian.strandberg]

I don't have detailed information for that but I can share the manual which describes the computational methods used in the program.  https://images.autodesk.com/adsk/files/hydrographs.pdf