Short of Importing a Manual Hydrograph from the results of one return
period generated separately? Ie, generate your 100 year hydrograph,
export, and save that model. Create your 25 year model, and import the
100-year hydrograph as 25-year results, and run.
Matthew Anderson, PE
John Mayo wrote:
> I need a hydrograph with identical 25 & 100 yr peak flows so I can add it to
> another hydrograph.
>
> I have watershed 1 which is piped to detention basin 1 with a 25 yr
> capacity. Larger storms to watershed 1 run down the road to detention basin
> 2 in watershed 2 which is not part of my study. Can Hydrographs be tricked
> out to add the 100 yr surface runoff to basin 1 & the 25 yr pipe flow?
>
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