Oregon City Scans to Combat Rain Infiltration

Solution enables popular mixed residential/industrial neighborhood to continue to grow

Oregon City Scans to Combat Rain Infiltration

Electro Scan personnel test four sewer pipes for leaks in Coos Bay, Oregon. The testing found a total of 112 defects representing an overall potential leakage rate of approximately 63,461 gpd.

Oregon is known for its rain. In fact, the state receives about 2.8 inches more rainfall per year than the national average. As a result, rain-dependent infiltration (RDI) is an issue for cities such as Coos Bay, a small Pacific costal community of roughly 16,000 which averages between 60 and 80 inches of rain per year. 

RDI can be difficult to locate using visual methods, since in dry weather a defect may not be actively leaking, making it impossible to see. Meanwhile, in wet weather, there may be too much water in the pipe to locate the defects visually. Coos Bay has an area zoned for industrial, commercial, single family and multifamily development, which will subsequently add a large amount of sewage to the system. The city has analyzed the existing sanitary sewer system that serves this area, determining that when RDI was taken into account, the area is over capacity, cutting off potential growth.

The city turned to Electro Scan technology for a way to locate and quantify its RDI. By locating and eliminating the RDI, the city hoped to be able to make room in the system for additional sewage.

Electro Scan testing was completed on four pipes. Sources of infiltration were identified, and results showed that the PVC pipe was in ideal shape and no defects were detected. However, three concrete pipes were in varying conditions of disrepair; a total of 112 defects were located, representing an overall potential leakage rate of approximately 44 gpm, or 63,461 gpd. 

The data resulted the city council’s decision to purchase an ES-620 for Sewer Mains system, which was installed in December 2015. 

More Info: 800/975-6149; www.electroscan.com.


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