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Sewer Interceptor Data Collection ArcGIS– Western Monmouth Utilities Authority, NJ

The Western Monmouth Utility Authority’s (WMUA) sewer service area (SSA) is comprised of seven interceptors ranging in size from 12 inches to 54 inches in diameter. They traverse from the upstream sections of the Authority’s SSA in Marlboro through Manalapan and deliver sanitary sewage to the Pine Brook Wastewater Treatment Plant for treatment prior to discharge into the Pine Brook.

T&M was asked to develop a hydraulic model to determine the maximum capacity of the existing interceptor system.

T&M’s Technology Group created digital field data forms to be utilized by the field survey crew to collect the information at each manhole using tablets. This information included ID numbers, GPS location, size, construction material, upstream/downstream pipe sections, manhole rim elevations, influent and effluent invert elevations, and frame and cover assessment conditions (plus photos).

Using Geographic Information System (GIS) mapping technology, T&M surveyed the manholes along the interceptors which included approximately 76,000 LF of pipe, 260 manholes and 4 pumping systems.

With the data collected, T&M utilized the InfoWorks modeling program to model the WMUA’s interceptor system. This entailed transposing the field survey data and basemap information into the hydraulic model. After the initial model was developed, an 8-week verification process was conducted within the InfoWorks model to test, identify and fix any errors.

Once the model was validated, it was used as a tool to evaluate current and maximum capacity of the existing interceptor system and assisted in determining the remaining capacity available in pipe sections. This will identify potential bottleneck areas or hydraulic constraints.

T&M provided the WMUA with an evaluation report of the existing interceptor system, which contained information critical to the operations of the overall system including design recommendations.

In the future, the data collected will be used to create an asset management database.

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