The City of Manchester, New Hampshire operates a wastewater collection and treatment system that provides service to approximately 90,000 city residents, business and industries, along with partial sewer service to small portions of five neighboring communities. Approximately 70 percent
of Manchester's collection system, or about 6,800 acres, is served by a combined sewer system with twenty-six (26) combined sewer overflow (CSO) outfalls that discharge wet weather flow to the Merrimack and Piscataquog Rivers. The CSOs are activated 2-3 times per month or approximately
75 percent of the time that it rains. A total of 220 million gallons (MG) of CSO is discharged to the receiving waters on an annual average basis.
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