Study streams, ranked in order of percent impervious cover in the watershed.

Notes:1Mean stream water concentrations recorded between June 2008 and July 2009.2Measure of cumulative heavy metal loading in July 2009 sediment samples.3Stream reach-averaged median sediment grain size based on surveys conducted in June 2007 and June 2009 [20], [21]. Low values indicate dominance by smaller sand particles. High values indicate dominance by larger pebbles and granules.4Total degree-days calculated with daily minimum and maximum temperatures using the double triangle method [56] and data taken between May 2007 and June 2007 [20].5Flashiness estimated from changes in hourly discharge between May and June 2007 [20].6Mean number of macroinvertebrate species belonging to Ephemeroptera, Plecoptera, and Trichoptera found in 2006 and 2007 surveys [21]. EPT richness is often used as an indicator of water quality; EPT species tend to occur in clean, well oxygenated waters [57].