Sewer System Evaluation Survey (SSES) Services



Main Line Televising – We have two crews trained to do televised inspections of the sewer lines. This is done by lowering a crawler (a small motorized vehicle) with a high powered camera into the manhole. Then the crawler goes up the sewer line while being controlled by cord in the van. Those in the van can then see via the crawler’s camera what condition the pipe is in. They are able to see and locate all defects and connections to the sewer main line. The crews are trained to be able then to conduct a PACP (Pipeline Assessment Certification Program) inspection. During the Rehab Project, this PACP inspection is turned over to our engineer who will take this information and use it to make his recommendations on which lines need to be rehabilitated and how.


Line Cleaning – We have two large tankard trucks which are used to conduct our sewer line cleaning. Both of these trucks have nozzles that can be lowered into the manhole and eject high-pressured water. The nozzle, connected to the truck by a thick hose, then runs up the sewer line and scours the inside of the sewer pipe. This high pressure water removes debris and breaks blockages. The nozzles also have extensions that are able to cut through roots and intruding service taps. During SSES work, every line is cleaned before the televising is done so that the line is completely clean and therefore easier to inspect.


Smoke Testing – During SSES and also for various regular operational needs, we conduct smoke tests. Smoke Testing involves our crews placing a smoke machine on top of manhole. The smoke machine creates smoke and then forces the smoke down into the manhole with a high powered fan. The smoke is then pushed throughout the sewer lines. Smoke will then rise up any services and show which houses or businesses are tied on. It will also show if there are holes or offset pipe joints in the pipe. This is extremely useful for showing I/I sources that will be corrected through Rehabilitation.


Manhole Inspections – Manhole Inspections are conducted to help us determine the condition of each manhole throughout a sub-basin. Manholes, just like mainlines, can have cracks and defects which let unwanted rainwater into the sewer system. The results of these inspections are also turned over to the engineer who will make recommendations as to what manholes will need to be replaced or repaired.


Flow Monitoring – Flow Monitors are meters which read the amount of flow going down a sewer line. These flow monitors are placed inside manholes at important locations around the District. They are pivotal in helping us monitor the rise in water flow which occurs during rainstorms. This information shows us how much I/I is getting into our system.


Rain Gauge Monitoring – At various locations around the District we also have Rain Gauges. Rain Gauges assist in knowing how much rain we’ve received in a given rainstorm. This information is incorporated and compared with our Flow Monitor Data.


Groundwater Monitoring – We also have Groundwater Gauges that serve a similar function with the rain gauges. However, the groundwater gauges measure the amount of water in the ground, which is not as immediately dependent on recent rainstorms. This information is also incorporated and compared with our Flow Monitor Data.