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Alpena MI | I use several different calculators, but none of them were showing GPM for over a 1" coefficient. Prinsco shows that, thanks for reminding me of their calculator. That is saying an 8" tile @ .5 grade will handle 335 GPM, and iGrow Drainage calculator is showing that if we were to pump the water from that pad at a 3" coefficient, we would need to pump 284 GPM. | |
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