Rainwater harvesting

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Yield:

1 acre * 1 inch rainfall per year = 6.273e+6 in^3 / year = 27,160 gallons per year
San Diego County 92-year average (minimum, std) rainfall data = 10.26 (3.41, 4.16) inches
75% catchment is considered good

Usage estimate:

50-70% of household usage is outdoors (e.g. lawns and gardens), average American uses 100 gal/day source: CT DPH
Average American uses 82 gal/day (29,930 gal/year) source: USGS
Average Californian uses 108 gal/day (39,420 gal/year) source: National Environmental Education Foundation
Average American drinks 44 ounces/day (126 gal/year) source: CDC

Sustainability Estimates

# of Californians sustained off 1 acre, based on...
- Annual Average Rainfall: 10.26 inches * 27,160 gallons/inch of rainfall = 278,661.6 gal / 39,420 gal/person/yr = 7 persons = about 2 average households
- Minimum Rainfall: 3.41 inches * 27,160 gallons/inch of rainfall = 92,616 gal / 39,420 gal/person/yr = 2.4 persons

Detailed resources for planning a build:

https://www.oregon.gov/bcd/documents/brochures/3660.pdf

But is it legal in California?

Rainwater Capture Act of 2012

Other resources I haven't looked at yet:

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