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Started by Verdigris on Sep 26, 2021 12:49:04 PM
Rainwater harvesting

Has anyone tried this for domestic use, beyond having water butts from which to fill the watering can?

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Verdigris - 26 Sep 2021 13:07:22 (#1 of 7)

I'm thinking about using rainwater to supply a lot of my non-drinking supply in my new gaff. The rainfall is consistently +/-100mm every month, so this seems feasible but is it cost effective?

Currently, there is an unmetered mains supply. For the past 15 years I've been on a metered supply and average around 7 cubic metres per quarter, which costs around £150 per annum at present. The water rates for the new gaff is about £650 per annum, so going metered looks like a no-brainer. Is it worth going the extra mile to use rainwater to further reduce my outgoings and save the planet a teensy bit of carbon?

tasselhoff - 26 Sep 2021 14:48:41 (#2 of 7)

I'm thinking about it. It's not just about cost, it's can also be for self-sufficiency.

We'll be adding a Doulton 0.2 micron under-sink filter for drinking water (and possibly UV sterilisation).

Verdigris - 26 Sep 2021 15:58:22 (#3 of 7)

I thought there was a private water supply at another place I looked at, so looked into filter and U/V costs. Not as expensive as I'd imagined.

nemo75 - 26 Sep 2021 17:08:08 (#4 of 7)

No chance of sinking a well?

tasselhoff - 26 Sep 2021 17:09:38 (#5 of 7)

Did you never watch Jean de Florette?

Verdigris - 26 Sep 2021 16:14:57 (#6 of 7)

No chance of sinking a well?



I could but it isn't really worth it if there is already mains water and drainage. You pay for drainage as a percentage of you mains water intake (on a meter) so the less that comes in the better. Using rainwater for non-potable uses (ie, the vast majority) reduces your bill considerably.

It must be vanishingly rare to have a private water supply and mains drainage. I'm not sure what they do in those few cases. I imagine it would be based on rateable value, like an ordinary unmetered supply.

rejonked - 26 Sep 2021 22:48:55 (#7 of 7)

It must be vanishingly rare to have a private water supply and mains drainage. I'm not sure what they do in those few cases.

Lots of houses round here have shared spring water, and mains drainage. Not sure how it works with meter billing. But although people like the idea of spring water it's a bit of a nightmare. The house I lived in was serviced by a tiny two-man band water company that didn't seem to maintain things well and could take ages to get the water supply back on if it went wrong. An incident happened when a dead sheep got in the tank and we all carried on merrily drinking the water unknowingly. Another friend had responsibility for spring with her neighbours, and no-one wanted to pay for urgent upkeep, and in the end the EA condemned it.

Rainwater sounds less stressful though.

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