Catchment area and land cover based on cumulative piped catchments draining to each site.

1 Forest cover is based on topographic catchment.
2 Total impervious area (%) includes all impervious surfaces identified by air photos and site visits [38].
3 Directly connected impervious area (DCIA) was calculated by subtracting the rooftop area draining to rain barrels installed in 2007 and 2008.
4 Stormwater management installations includes number of rain barrels and rain gardens installed in 2007 and overall (2007 & 2008), and the total density of barrels and gardens within each subcatchment.