Hydraflow Hydrographs vertical riser for inflow and vertical riser for outlet modeling

[bforr]

C3D 2023

To model an outlet as shown in the attached png would it be best to use a perforated riser with 0 openings or a culvert with a slope of 94,912.59% for a 6 foot tall outfall riser that would be a few inches higher that WSE. Seems the pressure wouldn't be correct.

Is this a standpipe?  First I've heard of it.  I have read the users manual for prf riser and weir riser and still not 100% sure of the input.  I think i've got the prf riser but the weir riser standpipe description says subtract the outlet from the inlet?   Looked for a sample model with a riser and couldn't find one.

I appreciate any help.

[fcernst · Accepted solution]

Yes, that's a standpipe riser, modeled as a Weir-Riser in Hydraflow..

[bforr]

Thank you Fred.  This lake has 4 standpipes.  Can only model one so I'll just multiply the flow and add to the report.

[fcernst]

That’s not going to track the volume routing process though ..for four.. use the total weir length of all four.. I guess they’re all the same height.. ?

[bforr]

ah.  I'll check that out thank you.