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Agricultural watersheds of the Midwest typically export nitrogen (N) and phosphorus (P) to surface waters causing contamination of drinking water reservoirs and, ultimately, hypoxia in the Gulf of Mexico. Two agricultural runoff wetlands, W1 (area 0.16ha, volume 660m 3 ) and W2 (area 0.4ha, volume 1780m 3 ), intercepting surface and tile drainage in the Lake Bloomington, Illinois,...