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» Already April in the garden !
by Chilli-head 19th April 2019, 6:18 pm

» The Polytunnel
by FloBear 15th April 2019, 4:45 pm

» What are you harvesting today?
by FloBear 9th April 2019, 6:38 pm

» Welcome guest
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» What arts and craft things have you been making lately?
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» White goods repair
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» Springtime (?) in the March garden
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» "Reservoirs can make water shortages worse"
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» Tall stool
by Ploshkin 23rd March 2019, 6:13 pm

» The frozen February garden
by Chilli-head 25th February 2019, 1:25 pm

» What have I done in the workshop today?
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» Green guilty pleasures and penance !
by Dandelion 15th February 2019, 6:11 pm

» Hornbeam avenue
by FloBear 15th February 2019, 5:00 pm

» The gardener's yearbook
by Chilli-head 4th February 2019, 1:24 pm

» Eco funeral options ...
by Dandelion 3rd February 2019, 5:17 pm

» Hungry Birds
by Ploshkin 1st February 2019, 1:01 pm

» First go at proper wine
by FloBear 30th January 2019, 6:36 pm

» January, welcome in a new gardening year
by FloBear 25th January 2019, 2:14 pm

» Seed swap anyone?
by FloBear 25th January 2019, 2:12 pm

» What are you preserving today?
by freebird 18th January 2019, 12:30 pm

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default What pump for rainwater harvesting?

Post by Hairyloon on 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 on 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 on 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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