Manhole risers a fit for large metro sewer networkProblem:Home to Birmingham, and more than 660,000 residents, Jefferson is Alabama’s most populous county. Its sewer network includes 3,600 miles of pipe and 80,000 manholes. That last figure represents a sizable amount of annual maintenance; though manholes themselves are durable infrastructure, they do need to be kept at grade. If they’re set low, water collects around the manhole lid causing excessive inflow and infiltration. If they’re set high, they become a traffic hazard jarring vehicle tires, lid and rim continually.Solution:Pivoted Turnbuckle Manhole Risers from American Highway Products are used by sewer departments
