If you missed our most recent webinar “Replacement or Rehabilitation? The Economics of Sanitary Sewer Improvements," be sure to watch the recording below.
Often times, I’m asked “When is it important to complete manhole inspections?” Manhole inspections should be performed during wet weather, or when the groundwater level is at its peak. Ideally, November to May is the best time to perform manhole inspections to detect inflow & infiltration (I/I). With the snow/ice melt in February and March compounded with heavy rains, Cities and Towns will notice flows spike at lift stations and wastewater treatment facilities. The five (5) most important items to take note of during manhole inspections that will help reduce (I/I) and eliminate potential backups are:
1. The Manhole Chimney During Heavy RainOne of the most important manhole components to observe during a manhole inspection is the manhole chimney. As you can see below, this manhole was constructed of precast concrete, with the exception of the manhole chimney which was constructed of brick. During dry weather the chimney may appear to be in good shape; but when the groundwater rises or heavy rains occur, you may see a different story entirely. It is often hard to believe you are looking at the same manhole, under slightly different conditions. For reference, the inflow that was observed to the right was entering at a rate of approximately seven gallons per minute.
Tags: sewer inspections
As cities grow and expand, the flow to wastewater treatment plants (WWTPs), also known as publicly owned treatment works (POTWs), increases. Many times, if preventative measures aren’t taken, the WWTPs can reach and exceed their capacity. What happens then?
When a treatment plant reaches or approaches 90% of it’s hydraulic or organic design capacity, Rule 327 IAC 4-1-3 states that IDEM will notify the operator that a Sewer Connection Ban may be necessary. The Town of Greentown, Indiana experienced these issues during the past decade. Town officials engaged with Wessler to make major improvements to their collection and waste treatment systems.
Adam Sitka has been an Engineer at Wessler Engineering for approximately two and a half years and was October's Employee of the Month. He does a little bit of everything in the office and in the field, see what he had to say about why he loves to crawl under homes to identify illicit sump pump connections.
6 Steps to Performing a Smoke Test
As Benjamin Franklin is famous for saying, “An ounce of prevention is worth a pound of cure.” The health of your sanitary sewer system is similar to our personal health. We take measures to stay healthy by getting a flu shot, going to the doctor for an annual checkup, eating well-balanced meals, and exercising 30 minutes daily. We hope by being proactive with our health maintenance, we will prevent illness. The same is true for your sewer system. If you maintain your sewers, you can minimize costly repairs.
In the time it would take you to get a coffee at Starbucks, you could have a clear photo of your community’s storm or sanitary sewer main.
With the introduction of the new haloptic quick view camera, you can quickly and cost-effectively inspect your sanitary and storm sewers to identify structural and maintenance issues and identify sewers that should receive closed-circuit televising (CCTV) and cleaning.