March 15, 2019 — As high-tide flooding worsened in Norfolk, Virginia in recent years, Margaret Mulholland, a biological oceanographer at Old Dominion University, started to think about the debris she saw in the waters that flowed back into Chesapeake Bay. Tipped-over garbage cans. Tossed-away hamburgers. Oil. Dirty diapers. Pet waste.
“This water is coming up on the landscape and taking everything back into the river with it,” says Mulholland, a professor in the Department of Ocean, Earth, and Atmospheric Sciences. “I was thinking how no one is counting this stuff (as runoff pollution). It drove me nuts.”
Nuts enough that she decided to sample those waters. That’s why on a recent Saturday morning she was steering her Chevy Bolt EV toward a narrow, flooded ribbon of Norfolk’s 51st Street at high tide. Marsh grasses bordered an inlet of the Lafayette River on one side of the street. A line of houses set back from the street rose on the other. Soon she came upon an overturned trash can, its contents underwater. A few feet away was a box. She opened it, and inside was a toilet. “Oh, this is good,” she said, pulling out her phone for a photo.
It’s an apt metaphor for her pioneering research project, which she has dubbed Measure the Muck.
With global sea levels steadily rising — already up 8 inches in the past century and now increasing at an average of 1.3 inches per decade — the incidence of high-tide “sunny day” or “blue sky” flooding is on the rise, especially along the U.S. East Coast. Those flooding events now routinely wash over sections of cities, and when the waters recede they take with them an excess of nutrients and a toxic mix of pollutants that flows into rivers, bays, and oceans.