Since 2006, the City of Alexandria, Va., has been aggressively rehabilitating its sanitary sewers to address infiltration and inflow. With the bar set high at bringing wet-weather peaks from 10 times to just two times dry-weather peaks, the job has been challenging.But with the help of consulting engineers for data analysis and project criteria development, and with outside contractors handling specific tasks like video inspection and trenchless repair, the city is well on the way to meeting its goals.Serving a population of 130,000, the city’s sewer system covers 15.2 square miles and includes 220 miles of sanitary sewer and 11
