Using the 25 GPM rule my usage would have been 16500 Gal but used 13000 Gal or 20% less.
Another water usage rule we used at work: 100 LF 1/2" garden hose at 65 PSI water pressure equals 30 GPM. We would compare large water usage to garden hoses (150 GPM pump was 5 garden hoses; 1200 GPM pump was 40 garden hoses, etc)
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