Narragansett Bay Commission Flow Monitoring Program

For over fifteen years, EST was contracted by the Narragansett Bay Commission (NBC) to install, calibrate, replace, and maintain continuous flow monitoring and rain gauge equipment throughout the NBC service area. This area is the largest wastewater authority in Rhode Island and is responsible for the operation of approximately 89 miles of combined sewer interceptors many of which are over 100 years old. 

Over fifty sites were monitored monthly using permanent and temporary open channel flowmeters.  The data obtained by these meters was used for billing, sewer flow analysis, including I/I, and for regulatory requirements.  The permanent meters were equipped with internal modems connected to dedicated phone lines.  EST performed maintenance, calibration, and troubleshooting of the flow meters and communications systems and initiated communications with permanent flowmeters monthly to upload the monitoring data at selected CSO sites. The permanent flow meters were connected to a wireless communication system which transmits the data back to a central location on a daily basis. In addition, EST installed rain gauges and performed meter testing, repair, and replacement. Traffic control was also provided to maintain the flow of vehicular and pedestrian traffic with as little disruption as possible.

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