number of people
gallons of water needed per person (to grow food, sanitation, etc)
average rainfall for the area
what else? I'm sure it depends on the soil and summer temperatures and how well you can direct and keep the water where you need it.
(average rainfall * acres ) - (number people * water person) > 0
Alternative answer: move to pacific northwest or tropics
I guess we could talk about the other necessities too, not just water. That little house in Pasadena grows enough food for the family, but I'm sure they need to import a lot of water, soil, wood ...
maybe this should have gone in homesteading
Some links to calculators and other helpful info:
tel jetson wrote:
keep in mind that except in a few truly arid climates, there is a roughly inexhaustible supply of water in the atmosphere. takes a little bit more ingenuity to capture it for use than rainwater or surface water, but there are many methods of doing so.
You're talking about this?
Assuming you are allowed to (or don't care about the regulations)...
Don't assume that moving to the Pacific Northwest will provide all your water needs without a major effort. I live in the PNW, and we have had essentially no rain this summer. The last significant rain was in early June. You need serious water storage to get through the summer on rainwater alone, since it is the winter's rainwater that you will be using. Our well is only good for 2 or 3 gallons per hour () , so ground water may not be a lot of help, depending on where you are.
definitely would take a decent amount of land, but it would certainly make a hillside useful.
Probably true, but not a lot of help if the water is wanted for household use too.
It might be possible to produce water for the household from a condensation pit, or as mentioned above on a larger property, an emergent spring.
Or maybe one should move to where rainwater collection is legal!