In a regulatory filing dated May 14, 2010, Friends of the Sebago Lake has recommended to the Federal Energy Regulatory Commission that a minimum flow of 250 cubic feet per second be required at the Eel Weir Dam at the outlet of Sebago Lake to protect downstream water quality.
A recent study by the Maine Dept. of Environmental Protection shows this outflow at Sebago Lake is necessary to ensure that dissolved oxygen levels in the lower Presumpscot River remain at the very high levels they are now achieving, which meet Maine Class A and Class B water quality standards.
See this story for more details.
UPDATE: The S.D. Warren wastewater treatment plant license carries the following minimum outflows from Sebago Lake between May 1 and Nov. 1:
a) A minimum outflow of 333 cfs (20,000 cfm) when the lake is within its target range.
b) A minimum outflow of 270 cfs (16,400 cfm) when the lake is below its target range.
c) An 'emergency' outflow of 250 cfs (15,000 cfm) when the lake is more than 1 foot below its target range; but only after flows have already been lowered to 270 cfs for at least four weeks.
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