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Does the 'area of each unit' when modelling rain barrels in SWMM represent the area of the impervious area contributing run-off into the rain barrel (for example the roof area) or the cross sectional area of the rain barrel itself? SWMM user manual and 'help' interprets this as the 'surface area devoted to each replicate unit'. However, it is still not out rightly clear. Feedback and discussion on this are most welcome.

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