Alchemy-Spetec Blog

Stopping Groundwater Infiltration in Manholes

Posted by David Park on Sep 23, 2021 10:00:00 AM

Banner - Stopping Groundwater Infiltration in Manholes

Body - Stopping Groundwater Infiltration in ManholesInfiltration is Draining Your Budget

In Sealing Water Infiltration in Leaking Joints, Inverts and Manholes, we identified strain and efficiency issues treatment plants undergo when groundwater infiltrates city collection systems. These common issues lead to large expenses that accumulate over time if left unchecked. A plan to minimize the damages must address the specific scale of the problems, the age and condition of your overall infrastructure, and your budget. A trusted, experienced team of consultants will prove invaluable as you navigate these uncharted waters.

Effective Manhole Infiltration Repair

According to the EPA, there are over 20 million manholes in the US. Water is infiltrating this aging infrastructure on a daily basis. If you're a municipal administrator or manager, you may already have sent in crews to eliminate the leaking with common waterproofing techniques such as applying hydraulic cement or epoxy coating. But these methods are not always 100% effective in the long term.

One of the most comprehensive ways to completely eliminate all groundwater infiltration in manholes is to encapsulate the structure using curtain grouting techniques. Specialty subcontractors utilize this technique by drilling through to the outside of the wall and injecting highly expansive polyurethane foam into the voids and soils behind it. The expansive chemical grout permeates the soils thanks to its low viscosity and creates a permanent water barrier that can fully encapsulate the manhole if necessary.

When to use Curtain Grouting

We've discussed sealing joint and penetration leaks in previous blog posts, but what if you have numerous leaks, are concerned about voids in the soil, or are repairing a brick manhole? Curtain grouting is especially useful for brick or block manholes that are made up of hundreds of joints and seams where water has many opportunities to penetrate the structure. Encapsulating the structure will polyurethane not only stops infiltration but also fills soil voids. Curtain grouting is just one technique among a handful of methods specially designed for eliminating groundwater infiltration. We recommend getting in touch with our Leak Seal Director of Technical Services, Charlie Lerman, for a free consultation to determine what leak seal methods are best for your infrastructure. Call him today at 404-618-0438. 

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Topics: All Posts, Seal Leaks