Difference between revisions of "Rainwater harvesting"
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* 1 acre * 1 inch rainfall per year = 6.273e+6 in^3 / year = 27160 gallons per year | * 1 acre * 1 inch rainfall per year = 6.273e+6 in^3 / year = 27160 gallons per year | ||
* San Diego County 55-year average (minimum, std) rainfall data = 10.26 (3.41, 4.16) inches | * San Diego County 55-year average (minimum, std) rainfall data = 10.26 (3.41, 4.16) inches | ||
| + | * 75% catchment is considered good | ||
Usage estimate: | Usage estimate: | ||
* 50-70% of household usage is outdoors (e.g. lawns and gardens), average American uses 100 gal/day [https://portal.ct.gov/-/media/Departments-and-Agencies/DPH/dph/drinking_water/pdf/27icwaterfactspdf.pdf source: CT DPH] | * 50-70% of household usage is outdoors (e.g. lawns and gardens), average American uses 100 gal/day [https://portal.ct.gov/-/media/Departments-and-Agencies/DPH/dph/drinking_water/pdf/27icwaterfactspdf.pdf source: CT DPH] | ||
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* Average American drinks 44 ounces/day [https://www.cdc.gov/nutrition/data-statistics/plain-water-the-healthier-choice.html source: CDC] | * Average American drinks 44 ounces/day [https://www.cdc.gov/nutrition/data-statistics/plain-water-the-healthier-choice.html source: CDC] | ||
Sustainability Estimates | Sustainability Estimates | ||
| − | * | + | * # of Californians sustained off 1 acre, based on... |
| − | ** Annual Average Rainfall: 10.26 inches * | + | ** 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 * | + | ** 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: | ||
| + | * https://www.oregon.gov/bcd/documents/brochures/3660.pdf | ||
| + | But is it legal in California? | ||
| + | * https://pioneerwatertanks.com.au/is-collecting-rainwater-illegal-in-california-ca/#:~:text=The%20Rainwater%20Capture%20Act%20of%202012,-All%20of%20that&text=The%20bill%20authorizes%20residential%2C%20commercial,systems%20comply%20with%20specified%20requirements. | ||
Revision as of 20:46, 26 December 2023
Yield:
- 1 acre * 1 inch rainfall per year = 6.273e+6 in^3 / year = 27160 gallons per year
- San Diego County 55-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?