John C Daley wrote:Another set of calculations
Rainfall is about 25mm per week across 12 months
So you have about 80 sq m of roof [ 780 sq ft ] x 10 weeks x 25mm
= 80 x 250mm
= 80 x .25M
Total volume captured over 10 weeks is
= 20 cubic M which is 20,000 Litres or about 5000 gals.
My source of data for water consumption is water consumption
Essentially from that data an efficient house would use 1000L per person in a very water efficient house per week.
John C Daley wrote:Good.
Perhaps purchase a 20,000L tank, install it where it would be required, get a pressure pump and set up a small water pipe system.
Its moving forward and giving you experience at the same time.
What are you building the house from?
Can you get a roof near the tank quickly?
$10,000 Barn Roof (2,000sqft barn to catch the additional water)
$1,100 Gutter ($3/linear foot, assuming a 4,000 sqft roof size)
$400 First Flush Filter ($50/each)
$20,000 Tank (about $1 per gallon)
$4,000 Tank Foundation
$500 Pressure Tank (maybe get two smaller separate ones for $250/each)
S Bengi wrote:
Tank Size = Days X People X Rate
Tank Size = 100days X 4ppl X 50gal/day/person
Tank Size = 20,000 gallon (~76,000L) (maybe not all of the tank will be useable due to sludge/filter/equipment/etc)
S Bengi wrote:
Yearly Water Needs = 365days X 4ppl X 50gal/day/person
Yearly Water Needs = 73,000gallon
Yearly Water Catchment = 2000sqft X 36inch/year X 0.623
Yearly Water Catchment = 45,000gallon (36,000gal at the usual 80% efficiency)
Catchment is less than Usage
You are not catching enough water, you will need to double your roof, from 2000sqft to 4,000sqft (barn/workshop/2nd house/etc)
But we’re not sure we can get a mortgage due to the rainwater system and wanting to be owner builders.
John C Daley wrote:Rebecca, please dont freeze your brain over building with a permit. They have a place in society, but your plans need to be detailed and not changed.
John C Daley wrote:Look under Rain Harvesting, that may open your world to stuff