Rainwater Catchment
- Goals - gutters, first flush filter, etc.
Catchment Calculation
Harvested water (gallons) = catchment area (square feet) [roof footprint] x rainfall depth (inches) x 0.623 [conversion factor]
Harvested water (liters) = catchment area (square meters) [roof footprint] x rainfall depth (millimeters)
https://www.watercache.com/resources/rainwater-collection-calculator
Water Usage
In Missouri, the average family's indoor water usage is about 50 gallons per person per day. Flushing the toilet accounts for about 42 percent of the total, the highest percent of indoor water usage. (There are several solutions to mitigate or eliminate freshwater usage for the flushing of toilets.)
https://energy.mo.gov/energy/consumers/information-resources/water-usage
Nationally, outdoor water use accounts for 30 percent of household use, yet that can be much higher in drier parts of the country and in more water-intensive landscapes. (There are several solutions to mitigate or eliminate freshwater usage for residential landscape irrigation.)