Cost-effective off-road I&I reduction

Though roughly twice as much as self-leveling steel covers, Moncton’s Sewer Systems Department estimates the frames will pay for themselves over time by reducing systemwide inflow and infiltration by one- to two-thirds.

Two years ago, the city began renewing manholes with an aesthetically pleasing ventless frame-and-lid system that bolts together with stainless steel fasteners to eliminate infiltration and thwart theft.

Most manhole construction leads to future aboveground obstructions and easy access to sewers. Though pickholes are less than an inch in diameter, a four-hole lid lets in 16 to 26 gallons of water per minute.

In Moncton, some sewer lines run beneath drainage ditches and manholes are raised to stay above flowing water in storm events. Many of these raised manholes are being replaced with watertight LifeSpan manholes, which can be placed at ground level and are more aesthetically pleasing.

Even completely submerged in a drainage ditch, the watertight manholes resist inflow.

Most manhole construction leads to future aboveground obstructions and easy access to sewers. Though pickholes are less than an inch in diameter, a four-hole lid lets in 16 gallons to 26 gallons of water per minute.

Where conventional manholes like this one are in or near backyards, the City of Moncton often installs a resilient-rubber manhole system to significantly lower sewer odor.

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