Site Analysis- Permeable vs Non-permeable

How about using the AREA tool to create a visual analysis of Permeable vs Non-permeable surfaces on a site plan. Revit can easily be used to compare the areas in both numerical view (Schedule) or visual with a color fill plan. An idea is to create a permeable parameter. You can then create a new view change view settings to see the site objects. Create some spaces and fill the parameter for permeable with Permeable or Non-permeable. Apply color fill based on permeable parameter. Finally create a schedule to extract information for square footage of each.