Difference between revisions of "Rainwater harvesting"
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Yield: | Yield: | ||
| − | * 1 acre * 1 inch rainfall per year = 6.273e+6 in^3 / year = | + | * 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 | * San Diego County 92-year average (minimum, std) rainfall data = 10.26 (3.41, 4.16) inches | ||
* 75% catchment is considered good | * 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] | ||
| − | * Average American uses 82 gal/day ( | + | * Average American uses 82 gal/day (29,930 gal/year) [https://pubs.usgs.gov/fs/2018/3035/fs20183035.pdf source: USGS] |
| − | * Average Californian uses 108 gal/day ( | + | * Average Californian uses 108 gal/day (39,420 gal/year) [https://www.neefusa.org/story/water/home-water-use-united-states source: National Environmental Education Foundation] |
| − | * 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 (126 gal/year) [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... | * # of Californians sustained off 1 acre, based on... | ||
Revision as of 18:29, 27 December 2023
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:
But is it legal in California?
Other resources I haven't looked at yet:
- https://www.harvestingrainwater.com/wp-content/uploads/Appendix3Calculations.pdf
- https://www.twdb.texas.gov/publications/brochures/conservation/doc/RainwaterHarvestingManual_3rdedition.pdf
- https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2015WR017871
- https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1864-2021.pdf
- https://www.watercache.com/faqs/rainwater-harvesting-benefits
- https://www.sandiegocounty.gov/content/sdc/dpw/watersheds/residential/RainBarrelInformation.html