In May of 2017 a trench drain, flow-rate measurement device, and rain gauge were installed in a private Minneapolis alleyway with a history of flooding, to capture a year of precipitation and runoff data. In May 2018 the alley pavement was replaced with PaveDrain permeable pavement system and a second year of data was captured. It was assumed that permeable pavers are effective at reducing runoff, but it was not clear exactly how effective they might be.
