In 2004, the City established a formal program to address our aging sewer system, which consists of about 1,400 miles of sewer lines within Greensboro city limits. The goal is to tackle one percent of our system each year.
Greensboro's first sewer rehab project took place in 1995 and consisted of slip-lining almost two miles of sewer pipe. Since then, the City has rehabbed more than 130 miles of sewer lines.
Many factors are considered in determining locations for sewer rehabilitation. Prioritization includes factors such as:
- Inflow and infiltration (excess stormwater and groundwater coming into the sewer system)
- Sewer capacities
- Age and material of the line
- Maintenance history
- Road surfacing priorities.
Sewer evaluations often have several steps that include:
- Installing flow monitors in manholes to identify areas where there is inflow and infiltration
- Conducting smoke tests to identify where inflow and infiltration is coming from
- Running closed circuit television cameras (CCTV) through pipes to determine what condition they are in.
What you may see in your neighborhood during smoke testing is smoke coming up from manholes. The smoke is non-toxic, non-staining, white to gray in color, has a slight odor, and creates no fire hazard.
Bursting uses hydraulic force to install a new sewer main underground. The old main is used as a conduit for the new main to follow. A hydraulic pulling system, coupled with cutting and expanding attachments, scores the old main, then expands and pushes the old pipes out of the way to allow a new pipe to be pulled in to its place.
When this method is used, you may hear the beepers of construction equipment when backing up and occasional loud pops coming from the work area.
Sliplining involves slipping a new, slightly smaller yet slicker pipe into a host pipe.
Smoke Testing - Door hangers are hung one week before this testing is done in your area.
Rehab Work - Door hangers are hung two weeks before work begins on a sewer line and again 48 hours prior to the start of work.
Watch your step on streets being rehabbed to avoid trip hazards. Remind your family, friends and business customers to be careful and patient driving in the area and to drive slowly.
City news releases announcing smoke testing and rehab-related traffic pattern changes and detours are issued to the media at least 24 hours in advance. These news alerts are also posted in the box on this page.
To receive automatic e-mail notifications about when a rehab job closes an intersection, road or lane visit this Web page. Sign up in the news section for “Road Closings/Traffic Alerts.”