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Designing for the difference between two hydro-graphs in Civil Storm

Hi,

if you have a number of catchments (many more than handful) and a network downstream that you want to design/analyze and you want to mandate that some of the individual catchments handle the 5 year return period storm run off on their own and then discharge to you the excess such that the downstream network is basically designed for the balance run off up to 10 year return period storm run off ... some catchments will still discharge the full 10 year return period storm run off straight into the network.

I was thinking on one way to model this is to use the LID  with say rain barrel control (defining storage and under-drain) such that the storage is sized for the 5 year return volume (offline estimation to define the input), and then the whole model is built and run for the 10 year (in terms of Rainfall hyetograph)... how does that seem of an approach?

is it better to go down the way of a pond / pond maker tool? 

thanks