Engineers Week: Manchester upgrades its pump stations
The City of Manchester owns and operates a 34 million gallon-per-day wastewater treatment plant that serves Manchester, Bedford, Londonderry, and Goffstown. There are over 375 miles of sewer in Manchester that convey wastewater flows to the plant.
To help convey these flows, the city owns and operates nine pump stations. Some of these pump stations are 35 years old, and their original equipment has reached the end of its useful life.
To address the city's pump station needs in a comprehensive and cost-effective manner, the Department of Public Works' Environmental Protection Division undertook a major $5 million pump station upgrade project.
The upgrade started in 2008, and a master plan identified the flows and capacity of each pump station along with projected flows for the next 20 years.
Design of the pump station improvements began in 2009, and the year-long effort prepared the design drawings and contract documents to be used for construction. Two of the pump stations were slated for replacement, one required new pumps, and another required new mechanical screens that are 70 feet tall. Lastly, each station was designed to receive new flow meters which would connect to new radio telemetry systems linking all the stations to the wastewater plant.
Construction started in the fall of 2011. The logistics of working on nine pump stations located all over the city presented several challenges. Construction work was limited to three pump stations at a time to manage the work in a controlled manner and to ensure minimal disruption of service to the city. The project was completed in the fall of 2012 ahead of schedule and under budget. Two new pump station were commissioned and the other seven all received significant upgrades.
This article was written by Fred McNeill, chief engineer for the Environmental Protection Division, Department of Public Works, City of Manchester.