Steve, I think you might have tripped up on your inputs. Assuming the 1 cuft/sec wasn't a typo, that is about 450gpm. Using 40ft of head, 300ft of pipe length of 4 inch pipe I came up with about 680 watts. In fact the calculator notes that 4 inch pipe isn't enough at that flow rate, and the wattage goes up to about 1500 or so at 6 inches.
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