See the real-world impact of Sewer Sentry's solutions. Explore our case studies to discover the measurable results and success stories behind our innovative sewer protection systems!
See how Sewer Sentry's innovative solutions have delivered measurable results for homeowners, businesses, and municipalities. Our case studies highlight real-world successes in reducing sewer inflow and protecting properties, demonstrating our commitment to reliability, long-term protection, and sustainable community development.
Available in both Cast Iron and Composite manhold covers.
Available in the following manhole lid sizes: 24 Inch, 26 Inch, 32 Inch.
Available in 4-inch and 7-inch heights.
The Sewer Sentry riser is available in Nylon 66 and Stainless.
All Sewer Sentry manhole cover gaskets are fitted with a 1” wide, 1/8” rubber seal that helps create minimal leakage between the sewer hole cover and bearing surface. The Sewer Sentry sewer solution system is installed through a hole that is drilled in the manhole cover using a rubber gasket to minimize leakage. It protrudes approximately 5/8” above the surface of the manhole cover, allowing some sheet flow over the cover but not high enough to damage bicycles, vehicles, etc.
The Sewer Sentry Manhole Vent Device was independently tested for compression strength with a minimum 6000 lbs. with no cracking or deformation. Sewer Sentry is offered in stainless steel, and DuPontTM Zytel® ST801-NC010A, a nylon 66 resin that is highly impact-resistant, chemical, UV, and heat/cold resistant.
The sewer sentry is installed with a rubber gasket constructed of commercial-grade EPDM (Ethylene Propylene Diene Monomer) blended rubber in 60 durometer (a measure of hardness).
EPDM provides superior properties for outdoor and high-temperature applications, with a minimum of 1000 PSI tensile strength, accommodating temperatures from -20 to 230 degrees F, provides resistance to ozone and many oxidizing chemicals and acids, and is highly resistant to sunlight.
US Patent 8,851,781 B1
From April 29, 2024 through July 22, 2024, Smart Cover devices were installed on different manholes in Richwood, Louisiana to measure the amount of rainwater inflow into a manhole during a rain event and the amount of time it took for the associated levels to return to normal. On each manhole measured, the data was collected before and after the Sewer Sentry was installed.
Note: These measurements are based on replacing 106 ring and covers with CAP Sewer Sentry.
Two-minute explanation of rainwater inflow using red dye
Two-minute demonstration of the Sewer Sentry in action
The Trenchless Technology Center (TTC) at Louisiana Tech University was contacted by CAP (Composite Access Products) to perform testing for a comparison of its 24” and 30” composite polymeric manhole lid versus a typical cast iron manhole lid for inflow leakage. The AS3996 testing procedure provided to the TTC was used to carry out the leakage testing. The setups and results and described below.
The leak testing done at the TTC showed the CAP system performed much better than a typical cast-iron manhole lid even without bolts. The 24-inch CAP lid only leaked between 1-2.5 GPM with all four bolts removed, and the 30-inch CAP lid only leaked between 1-5 GPM with all four bolts removed. The cast iron lid leaked approximately 45 gallons per minute.
Leak Testing
The Trenchless Technology Center (TTC) at Louisiana Tech University was contacted by CAP (Composite Access Products) to perform testing for a comparison of its 24” and 30” composite polymeric manhole lid versus a typical cast iron manhole lid for inflow leakage. The AS3996 testing procedure provided to the TTC was used to carry out the leakage testing. The setups and results and described below.
The table below represents the total leakage over a 10 minute period for both size manholes.
Table 1: Flow Rate Data
Table 2: Flow Rate Data (Bolts Removed)
The table confirms that there was no leaking from the manhole when the AS3996 testing procedure was followed.
A secondary leak test was performed out of curiosity. The same procedure was followed with a set number of bolts removed in each test. It should be noted that the dirt shield covers were not covering the holes of the bolts that had been removed.
Comparing kilowatt usage of pump stations before and after Sewer Sentries show an average of 25% reduction in electricity bills for an entire year.
Treatment cost has gone down during rainy months on average $10,000 per month with only 1600 out of 3000 manholes equipped with the Sewer Sentry.
Flooding of homes and businesses due to rainstorms has gone from 3 a year down to 0.
Complaints about the smell of pump stations has gone from 8 per year down to 0.
The Sewer Sentry device stops storm water from going through hole in the manhole cover simply by creating a new point of entry ―a “raised hole”―that is 5/8” higher than the surface of the manhole. At the same time, it reduces sewer gas problems, by allowing enough oxygen to reach the sewer.
Kilowatt Usage Comparison
Year 2013 52.6" Rainfall
Year 2015 56.9" Rainfall
4.3" of Additional Rainfall
Report of SSOs due to rainstorms in the first Quarter of the year have gone from 40 down to 1.
