Manhole Rehabilitation and Replacement

The Manhole Replacement project is designed to ensure a reliable sewage system flow. The district uses manholes to access the sewage lines for maintenance and repairs. The failure or collapse of a single manhole can cause blockage and backup to the sewage system.

While the manholes along Horizon Boulevard were failing, the District was able to rehabilitate them with Triflex Liners and extend their life cycle significantly. Additionally, 23 manholes were rehabilitated along the main sewer line toward the wastewater plant. These liners are rated for 20 years.

By contrast, the older, concrete manholes were lined with a protectant to resist corrosive hydrogen sulfide (H2S) gas released by passing sewage.

“We have accessed other fiberglass-lined manholes that have been in the system for 20 years, and they still look new,” said Charlie McGinnis, the district’s general manager. “These manholes are a sound investment for the water district’s customers.”

The current network has between 2,000-3,000 manholes throughout the district. Depending on the size of adjacent pipes, manholes are located every 500 or 1,000 feet, in accordance with state requirements.

This rehabilitation and replacement project was funded by bond money to maintain and keep up with growth in the district.