A 24-inch sewer main under one of your city’s busiest downtown streets is backing up. You send a camera in and discover someone has dumped concrete into the line. Your jetter or rodder isn’t going to solve the problem.

Even if you find the culprit who dumped the concrete and can recoup the costs, you’re still going to have to dig up the street, reroute traffic, and inconvenience everyone in the area. It’s not a good situation, but historically, there haven’t been many...