Created Thursday 10 December 2020
Roof Rurfaces
house = 311m2
garage = 58m2
total roof area = 369m2
Anual Average rainfall Canberra = 624mm
Annual total average collectable rain water: 624 * 369 = 230,256 litres = 230,256 Kl / year
consumption:
20/08/19-20/11/23 3months 29kl @ $2.46/kl
First Aproximation Annual consumption: 4*29= 116 kl / year →: 116000/365= 318 L/day
Second Aproximation Annual consumption: (90*1500)+(90*2000)+(90*500)+(90*300)= 387000L/year →: 387000/365= 1060.27L/day
For a 30,000L tank → : 30,000/369= 81.3mm of rain needed to fill the tank
230,256 L of water per year allows for: 230256/365/2~= 315 L Per day per person for 2 people = 630 L per day of usable tank water for 2 people
(90*1500)+(90*2000)+(90*500)+(90*300)= 387000