Difference between revisions of "Rainwater harvesting"

Revision as of 18:19, 27 December 2023

Yield:

1 acre * 1 inch rainfall per year = 6.273e+6 in^3 / year = 27160 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 (29930 gal/year) source: USGS
Average Californian uses 108 gal/day (39420 gal/year) source: National Environmental Education Foundation
Average American drinks 44 ounces/day 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:

But is it legal in California?

Other resources I haven't looked at yet:

@@ Line 11: / Line 11: @@
 * # 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
-** 97.5% Coverage (Avg - 1 StDev): 6.1 inches * 27,160 gallons/inch of rainfall = 165,676 gal / 39,420 gal/person/yr = 4.2 persons = about 1.3 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