For years, residents of a historic neighborhood in Charles City, Iowa, endured street and yard flooding after rains of one inch or more. Instead of installing new streets and storm sewers to solve the problem, city officials chose permeable pavers.Now, 154,500 square feet of attractive concrete paver-block roads line 17 blocks of this city of nearly 8,000 residents. The paver system naturally collects and filters stormwater runoff, reducing loading to the storm sewer system.“People at Unilock, which manufactured the pavers, tell me this is the largest residential retrofit permeable-paver project in the United States,” says Eric Otto, a civil and
