Summer and winter in situ denitrification rates for each study wetland site: MBR = Minebank Run, SR = Stony Run, and BR = Baisman Run wetlands. Values are mean ± standard error of minipiezometers sampled in each site between June 2008 and December 2008. Comparison of means by site showed that the oxbow 2 wetland had significantly (P < 0.05) higher denitrification rates in winter than in summer, whereas the constructed stormwater wetlands (CW) 2 had higher (P < 0.05) denitrification rates in summer than winter (Fig. 8). Across all wetland sites, the CW2 wetland had highest (P < 0.05) denitrification rates.