A huge opportunity has opened its self up. The city has agreed to postpone a portion of the Development cost that would upgrade the water main supply from 13mm to 19mm. Typically projects like this are required to upgrade the water service because of additional fixtures. What we will attempt to prove is that the rainwater collection systems we have planned, combined with the single occupant of the house will mean minimal increase in water usage for the new building. This opportunity does NOT mean that we have avoided paying the development charges. What it means is that they have allowed us to delay the expense of the water supply upgrade until renovations/additions are carried out on the existing house. We should also point out that this opportunity is a one off and we expect that this generous exception will not happen again.
So the rain water system is looking promising once more. We are considering a redesign of the storage tanks right now and may opt for builtin concrete tank, instead of food grade plastic tanks. But the system as planned will be collecting rain water into a 9m3 tank (2500 gallons). This will be cleaned and filtered to near potable standards (including but not limited to 5 micron filter + UV + Black Carbon filter) before it is distributed to the Laundry, toilet (should we need it), and outside irrigation system. There is some debate about using this light grey water is appropriate in the dish washer.
The City will require their water to feed the kitchen sink, bathroom sink. Laundry sink and shower.
Looking forward to seeing how this project will develop.