Gwinnett County Sanitary Sewer Evaluation Services


Woolpert has worked with Gwinnett County on their sanitary sewer system since 2005—identifying, prioritizing and implementing a find-and-fix program that reduces inflow/infiltration (I/I) in the county’s sanitary sewer system. The system includes more than 2,140 miles of pipeline, ranging from 8 to 72 inches in diameter, and contains 197 pump stations and eight water reclamation facilities.

Woolpert’s team of water experts provided flow monitoring, smoke testing, dye flooding, field inspections, data review, and report preparation services. Over a two-year time frame, these activities included smoke testing more than 1.5 million feet of sanitary sewer and inspecting more than 6,000 manholes. Projects include:

Big Haynes Basin

This area of study included 27 flow meters, six rain gauges, four groundwater gauges, two stream gauges, 2,563 manhole inspections and GPS surveys, and 521,504 linear feet of smoke testing.

Flow Monitoring

Woolpert has worked on several temporary flow monitoring studies for Gwinnett County. Plans include a long-term monitoring plan and the use of temporary flow monitoring studies, which called for selecting locations and installing meters, monthly maintenance, and data acquisition and processing.

Data Review and Field Inspections

Woolpert utilized the county’s existing GIS data as a background layer for use on field computers while performing all SSES activities.

Report Preparation

At the conclusion of each monitoring period, Woolpert prepared reports to document the findings. These reports summarized I/I findings and provided insight to the operation of the sewer system. The reports used the data Woolpert collected to develop basin and sub-basin priorities for the county’s follow-up I/I reduction program.

Critical Crossing Inventory and Condition Assessment

Woolpert located and assessed sewer and water pipe crossings located under roadways, over creeks, under buildings and parallel to bodies of water. For each crossing, Woolpert documented physical attributes, structural conditions and the location. The collected data was submitted in a geodatabase format what was compatible with the county’s computerized maintenance management system (CMMS). The study inventoried nearly 9,000 crossings.

Sewer and Stormwater Assessment Program

Woolpert is currently contracted to inventory and assess Gwinnett County’s sanitary and stormwater collections systems, which entails:

  • MACP inspections of over 20,000 structures annually,
  • CCTV inspections of over 800,000 linear feet annually, and
  • GPS surveying.

Woolpert collects, processes and submits all data to be compatible with the county’s CMMS, Lucity.

Gwinnett County Department of Water Resources

Gwinnett County, GA