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 | + | * San Diego County 92-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] | ||
| − | * 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 (with 100% catchment), 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 |
| − | ** | + | ** Minimum Rainfall: 3.41 inches * 27,160 gallons/inch of rainfall = 92,616 gal / 39,420 gal/person/yr = 2.4 persons |
| − | ** | + | Storage Capacity: |
| + | * number of people * daily water consumption (gal/person/day) * longest drought period (days) = needed storage capacity (gal) [https://www.harvestingrainwater.com/wp-content/uploads/Appendix3Calculations.pdf Source] | ||
| + | * 5 * 108 * 150 = 81,000 gal | ||
| + | Detailed resources for planning a build: | ||
| + | * https://www.oregon.gov/bcd/documents/brochures/3660.pdf | ||
| + | * https://www.twdb.texas.gov/publications/brochures/conservation/doc/RainwaterHarvestingManual_3rdedition.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. Rainwater Capture Act of 2012] | ||
| + | Other resources I haven't looked at yet: | ||
| + | * 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 | ||
Latest revision as of 22:49, 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 (with 100% catchment), 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
Storage Capacity:
- number of people * daily water consumption (gal/person/day) * longest drought period (days) = needed storage capacity (gal) Source
- 5 * 108 * 150 = 81,000 gal
Detailed resources for planning a build:
- https://www.oregon.gov/bcd/documents/brochures/3660.pdf
- https://www.twdb.texas.gov/publications/brochures/conservation/doc/RainwaterHarvestingManual_3rdedition.pdf
But is it legal in California?
Other resources I haven't looked at yet:
- 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