I think you would need a pond or somewhere to store it efficiently. They have tanks that can store that amount https://www.tankandbarrel.com/plastic-poly-vertical-water-storage-tanks-pm10000-bushman-vertical-water-storage-tank-10000-gallon-p-3221.html but they're pretty expensive. Although, I doubt you would need such a large system to buffer those 14000 gallons unless all the rain falls in a very short period of time.
The water is useful for irrigation. Dripline systems are pretty efficient I'm doing a 10x20 ft garden area and it seems to need about 50 gal/week. If I was to capture the water on my roof I could do 5x the areas on just the roof water alone.
Not really practical given the cost of water in this area, but it's neat to try and go closed-loop as much as possible.
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