Stemming the Tide of I&I

Island community takes an innovative approach to tightening its collections system and reducing treatment volume.   

Stemming the Tide of I&I

A camera cable, hoses carrying the two-part grout mix, and air lines for the grout packer pass over a roller on a manhole. The grout packer is attached in the sewer line.

In a perfect world, average daily flow to the wastewater treatment plant on Sullivan’s Island, South Carolina, would be 182,000 gpd. That’s what the utility distributes daily in potable water and, theoretically, should receive back through its closed collections system.

However, the actual flow to the plant averages 552,000 gpd, according to Greg Gress, who manages the island’s water and sewer department. The 370,000 additional gallons enters the system through bad...

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