Hydraflow Hydrographs estimated detention - inflow hydrograph contains zero peak

[bforr]

In Hydraflow Hydrographs, I have two scs hydrographs with 25 yr peak flow of 195 & 236 cfs.  I go to pond tools and pick the hydrograph with 236 as my input and when I input 195 as my target I get an box saying "Inflow hydrograph contains zero peak flow.  Cannot compute."  I don't understand how it says that when in the Qp In for the 25 it shows 236 cfs.  I can pick the input for the other that shows Qp 195 and input something and it returns with a value.  Why does HH not recognize the Qp for this hydrograph?

[Anonymous]

I have the same error, hydrograph selected OBVIOUSLY has a peak flow.

Set up basin volume wanting to size outlet.

I selected every hydrograph in the set with the same results.

Apparently there is no answer from the BORG, er Autodesk.

[fcernst]

COMBINE  those hydrographs and route through the pond. 

[Anonymous]

I don't think you understand the question. The basin has storage. The hydrographs HAVE peak flows, and don't need to be combined. I want the program to give me an estimate as to the outlet size(s) to meet the required reduction in flow. I have entered target flows. The attachment is what happens.

And guess what?  Your forum does not allow me to attach my .gpw file so you can recreate the error.

[fcernst]

Do you have a 1 year event? If not, you have to turn it off.

You can rename the file with a .txt extension or zip it.