Wastewater plant working with DEC to account for high flow rates from 2011 flooding

NORWICH – It’s been six months since September’s floods devastated the area and nearly a year since the 2011 spring flooding, but the city’s wastewater treatment plant is still seeing the adverse effects of both floods that caused it to exceed water flow rate regulations set by the New York State Department of Environmental Conservation.
According to Department of Public Works Superintendent Carl Ivarson, the March-April flooding and September floods in 2011 were both designated disasters by state and federal authorities. But while the DEC has made adjustments in the plant’s mandated flow rates to accommodate for September’s storms, similar adjustments were not made for March and April’s flooding, forcing the plant to justify exceeding its flow rate last spring to the DEC, explained Ivarson.
Heavy rains and melting snow were the cause of flooding at the wastewater treatment plant a year ago. The flooding that occurred was worse than that caused by heavy rains in September, Ivarson noted.
If the state refuses to revise the city’s water flow rates to account for both floods, Norwich faces potential financial penalties.
“Each wastewater treatment plant has its own parameters and are expected by the DEC to meet those parameters,” Ivarson said. Such parameters are adjusted according to two seasons: The wet season, which occurs during the winter and spring months; and the dry season, during the summer and fall months.
Based on the plant’s average flow charts, regulations set by the DEC say that the city’s plant is not to exceed 2.4 million gallons per day during the wet season, but with the heavy amounts of rain and runoff from melting snow, the plant saw as much as 2.7 million gallons per day during the March-April and September floods.
Adjustments made to account for September’s flooding was the “first and only time” the DEC has allowed the plant to fall outside of its parameters, said Ivarson.
Ivarson is now continuing discussions with DEC officials to have the March-April flow rates revised, too. Should the DEC refuse his requests, the next step is for him to develop a strategy to reduce the amount of flow into the plant, which will be included when he applies for the plant’s annual certification later this year.
“The city wouldn’t anticipate a response until the application deadline in August,” he said. But if further action is needed, the city may have to inventory, possibly even replace some of its infrastructure to stay within its flow rate parameters – actions that could be costly for city taxpayers.
“This is the first time since 1990 that the plant’s been above design flow,” claimed Ivarson. “And the sole reason is because of melting snow and heavy rains.”

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