### LID area and impervious runoff calculations

Hi users, Just a query regarding LID's in SWMM. Let's say that impervious sub-catchmant A has a total area of 100 m2. Let's say that I deploy a LID into sub-catchment A (a rain barrel) and set its surface area as 10 m2 (thus it occupies 10% of sub-catchment in A). In doing this, does SWMM therefore calculate the runoff from sub-catchment A using an 'adjusted' area of 90 m2? Cheers, Matt. 100SM.inp

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