Difference between revisions of "Rainwater harvesting"

Revision as of 21:38, 26 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
- 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

Detailed resources for planning a build:

But is it legal in California?

Other resources I haven't looked at yet:

@@ Line 16: / Line 16: @@
 * https://www.oregon.gov/bcd/documents/brochures/3660.pdf
 But is it legal in California?
-* http://www.leginfo.ca.gov/pub/11-12/bill/asm/ab_1701-1750/ab_1750_bill_20120606_amended_sen_v96.html0of%20that&text=The%20bill%20authorizes%20residential%2C%20commercial,systems%20comply%20with%20specified%20requirements.
+* [http://www.leginfo.ca.gov/pub/11-12/bill/asm/ab_1701-1750/ab_1750_bill_20120606_amended_sen_v96.html0of%20that&text=The%20bill%20authorizes%20residential%2C%20commercial,systems%20comply%20with%20specified%20requirements. Rainwater Capture Act of 2012]
 Other resources I haven't looked at yet:
 * https://www.harvestingrainwater.com/wp-content/uploads/Appendix3Calculations.pdf