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» What have I done in the workshop today?
by Dandelion 2nd December 2022, 1:12 pm

» What are you harvesting today?
by Dandelion 2nd December 2022, 1:12 pm

» Wartime marrow casserole
by Dandelion 18th October 2022, 4:42 pm

» New Kiva loan
by Dandelion 6th September 2022, 9:21 pm

» Late sowings in August ... beans ?
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» Come August, come night in the garden
by Chilli-head 4th August 2022, 3:29 pm

» Welcome guest
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» The Jolly July Garden
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» More mead ...
by Chilli-head 13th July 2022, 12:52 pm

» The June garden thread
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» March into the garden
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» Some thoughts on resilience
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» February garden action !
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by Dandelion 8th February 2022, 8:50 am

» Preparing for winter
by Ploshkin 7th February 2022, 8:56 pm

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What pump for rainwater harvesting?

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default What pump for rainwater harvesting?

Post by Hairyloon 23rd March 2010, 8:26 pm

Like it says in the title.
It is easy enough to find a suitable container and plonk it under the down pipe, but obviously the water needs to be pumped back up to where it is needed.
Anyone got any recommendations what pump to use? Does it matter much?
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default Re: What pump for rainwater harvesting?

Post by Wilhelm Von Rhomboid 23rd March 2010, 8:35 pm

When doing the calculations for greywater recycling the power consumption of the pump has to not increase the carbon loading by more than IIRC 0.7kg or the overall ecological impact becomes negative rather than positive (using CfSH methodology, at least).
I would guess the same applies to rainwater harvesting.
A lot of people I have seen have the rainwater tank mounted atop the garage roof or similarly at first floor or higher level, and use it to feed ground floor appliances just with gravity.

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default Re: What pump for rainwater harvesting?

Post by Hairyloon 23rd March 2010, 8:52 pm

Wilhelm Von Rhomboid wrote:the power consumption of the pump has to not increase the carbon loading by more than IIRC 0.7kg.
Is that difficult to achieve?
I suppose some kind of turbine in the outgoing pipe to help drive the pump for the incoming water would be a recipe for disaster.
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