The answer is unknown. In order to answer this question you need to know the pressure of the water.
A spring will flow when the water table is above where the spring exists. If no moisture replentishes the water table, or aquifier, then the spring will discontinue fo flow.
5 imperial gallons per minute
To test the flow rate for a stream in gallons per minute, you can use a flow meter specifically designed for measuring water flow rates. Install the flow meter at a suitable location in the stream and allow water to flow through it. The flow meter will provide you with the gallons per minute measurement based on the rate of flow passing through it.
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The rate of flow is 50 gallons per minute. This is calculated by dividing the total gallons pumped (750 gallons) by the time taken to pump (15 minutes).
That obviously depends how fast the water flows! If you have the water flow in gallons/second, you can divide your 660,000 gallons by this number to find out how many seconds it takes. Then divide the result by 3600 to convert to hours. Similarly if you have the flow in gallons/minute - only that in this case, for the final conversion you divide by 60.
About 1.25 gallons per minute.
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When the ground water flow out of the earth surface as a form of spring.
The flow rate in cubic feet/second is (3*1.5*3) = 14.5 cubic ft/sec. According to Google, there are 6.229 Imperial gallons or 7.481 US gallons in 1 cubic foot. Therefore, the flow rate is 90.32 Imp gallons/sec or 108.47 US gallons/sec. If this many gallons flow per second, then (90.32 x 60) = 5419 Imp gallons flow per 1 minute, or equivalently 6508 US gallons per minute.
A natural flow of water from underground is called a spring. Springs occur where an aquifer is filled to the point that the water overflows onto the land surface. This flow of water can create streams or rivers.