RE: Converting a swimming pool into a cistern
- Subject: RE: Converting a swimming pool into a cistern
- From: &* N* <m*@internode.on.net>
- Date: Thu, 16 Jul 2009 08:38:05 +0930
Hi Ben & others who are interested in
pool conversions The pool is 45ft long x 20ft wide x 8ft
deep grading to 3 feet. I think/ guess it is about 50,000 gallons – we think
in Centimetres and litres so it’s a bit hard for me. It to 3 days and
nights to fill when we first filled it with the tap running full bore. Our garden is almost a half an acre,
slight slope to the SW – most exposed to afternoon heat in summer, very
shallow slightly acidic sandy loam over fractured shale and quartzite. No, the gutters go into our two big new rainwater
tanks. The s/pool almost fills entirely on what rain gets through the slatted
deck that now sits over the old pool hole. I will try to send a photo of what
it looks like. We use a submerged pump permanently in
place with a long 1” diameter hose attached. We don’t use an
irrigation system but move the hose to flood, pond and soak areas as needed –
as I said old trees and our veg patch plus a bit for my greenhouse of
Madagascan and South African plants. I have designed our garden so it gets by
with grey water and the above stored water. We do not use potable tap water on
the garden except for my wife’s few potted plants on our front porch. We have switched our psychological and
cultural focus from gardening in Spring, Summer and Autumn with a winter rest
(the old Anglo-European tradition) to gardening in Autumn, Winter and Spring
with a summer rest. That makes sense to us, saves summer work and watering, and
is in tune with what happens naturally Down Here. That way we work with our
seasons and do not try to fight them. Philosophically I don’t believe that
gardens should be green from top to bottom, front to back, side to side. It’s
a concept based on an Arcadian fantasy developed by the Romantic poets and
novelists. We shouldn’t expect it; it’s not a real possibility:
everything has its season of growth and rest, of green-ness and dormancy or
brown-ness. In American terms it’s a bit too Hollywood. Florence Yoch has
a lot to answer for. As do American lawn companies, fertilizer companies and
chemical companies – those in the All the plants you list would grow well
here under our circumstances IF I chose to grow them. I don’t. Hope this helps. trevor From:
owner-medit-plants@ucdavis.edu [mailto:owner-medit-plants@ucdavis.edu] On Behalf Of Ben Wiswall Hi Trevor, Thanks for the info! It sounds like your climate, with five months of utterly rainless
summer, is comparable to southern What is the pool's capacity? And how large is your garden? I assume roof gutters now feed the pool/cistern? Do you use a pump to water the garden with a hose, or is it connected
to some kind of irrigation system? By late summer the pool is empty: how much of your garden water
could realistically be supplied by the pool/cistern alone? If you did rely solely on harvested rainwater, would you have enough
water to have a garden with a green roof and a green floor? (For example,
Callistemon citrinus and Myoporum parvifolium, or Olea europea and Sedum
anglicum, or Rhus lancea and Drosanthemum rosea, etc.?) Those are just my
minimum requirements for a mediterranean zone garden: in the true desert, I
might tolerate a groundcover of gravel or DG, but not here. If you know, let me know. Thanks, Ben Armentrout-Wiswall From: We did it two years ago. A standard
in-ground concrete pool was converted to a cistern of sorts – the
affordable sort. We fitted a wooden deck over the top with gaps between the
slats so rain can get in; a trapdoor for inspections, access to submersible pump
and access to sweep out dirt and leaves etc during late summer when it has run
dry. The supporting structure is a framework of water-proof timber. Cost me
around $6000 Australian and could be done by any competent wood-structures
builder with a helper or two. We use the water ONLY for our garden. To comply
with building regulations/ health regs etc to save drinking water we would have
to have a sealed pool with guttering from an adjacent garage, it would have to
be mosquito proof – absolutely, and the internal support structures would
have to be of non-rusting steel fabricated to fit + pump and access point. Our
quote from the same builder we used was around $20,000 – hardly economic
for us. As it is the pool/ tank/ cistern
doesn’t quite fill over a regular winter – last yr very below
average, this yr going above but it is a very handy contributor to keeping
established trees and veg garden going through our usual 5 month hot and
utterly rainless summer. And we can still add 3 more narrow profile tanks to
collect 15,000 litres from our garage. This is my next project – maybe
2011 if I can get my books re-published. It is hard work when you are on a
super-pension so DO IT WHILE YOU ARE STILL IN WORK if you can. Regards Trevor N. From:
owner-medit-plants@ucdavis.edu [mailto:owner-medit-plants@ucdavis.edu] On Behalf Of Ben Wiswall Hi All, Has anyone any experience with converting a swimming pool into a
cistern? There was an article about it on a Metropolitan Water District
website, and though we don't have a pool, this would make sense for someone who
had a pool but didn't really use it. -Ben Armentrout-Wiswall |
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