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Flow rate through a dam in gallons/seconds

Question description
The Conowingo Dam is the southernmost dam on the Susquehanna River, and is critical flood control project and electric power generator. Water flow through the dam’s turbines and flood control gates is roughly approximated by the following equation.
Discharge (gallons/second)= 1,500 + 350,000 ( # inches of rain received in Harrisburg, PA in the prior 30 days)
a) The lowest recorded discharge flow through the dam occurred in 1969 after a period of drought where there was no rain in the previous 30 days ( and almost none the previous 60 days). What was the flow rate through the dam at that time in gallons/seconds?
b) The highest flow rate through the dam occurred in June 1972 when Hurricane Agnes stalled over Central Pennsylvania and roughly 21 inches of rain few on Harrisburg in the prior 30 days (most of it in 3 days) What was the flow rate through the dam at that time in gallons/seconds?

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