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benefits of rainfall collection

 
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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
pollinator
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GOING BACK TO THE QUESTION OF WHAT VOLUME OF WATER NEEDS TO BE STORED FOR A FAMILY OF 4 OVER 3 DRY MONTHS
From my data of Melbourne a water  efficient household uses 750- 1200L of water per person per week
water usage data

Lets allow 1000L per person per week over 13 dry weeks.
1000L x 4 people x 13 weeks gives a required stored water volume of 52,000 L

MY EXAMPLE EARLIER IS INCORRECT.
HAVING BEEN ASKED TO EXPLAIN, I WENT THROUGH MY NOTES AND REALISED I HAD EXCLUDED SHOWERING AND KITCHEN USE.
I AM WORKING AT NIGHT HERE, PERHAPS I RUSHED I AM SORRY.
BUT I CANNOT YET EDIT THE OLD POST.
SO 52,000L needs to be stored not 26,000L
 
pollinator
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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.



Just wanted to give a quick thank you for sharing your water consumption resource.

Rainwater is back on my mind after a short break now that we're discussing construction- and we'll need water for the construction sight even before the roof goes up. We'll have to truck in water until we can collect.
 
John C Daley
pollinator
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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?
 
Rebecca Blake
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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?



We’re planning on doing aerated concrete ICF blocks.

My husband did mention something about getting some kind of cheaper roof over head for shade during construction... perhaps we’ll get a carport put up first for this purpose. It would also help to have that extra roof for rainwater needs as my recent calculations were pushing it. (My calculations did not include carport or garage)
 
John C Daley
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Something extra I encourage in Australia, put good quality insulation under the carport roof.
It will stop condensation and stop heat pouring through the roof in summer.
 
John C Daley
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INFORMATION ABOUT LEGALITY OR REGULATION OF RAINFALL CATCHMENT
USA - legal mechanisms if any in the USA about rainfall collection
 
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