RE: Converting a swimming pool into a cistern


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 UK, Europe and here too, tho’ they are probably all parts of the same few global conglomerates.

 

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
Sent: Thursday, 16 July 2009 3:33 AM
To: Margaret Nottle
Cc: medit plants forum
Subject: Re: Converting a swimming pool into a cistern

 

Hi Trevor,

Thanks for the info!

It sounds like your climate, with five months of utterly rainless summer, is comparable to southern California.  So, I have a few questions.

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

Simi Valley, inland southern California

 


From: Margaret Nottle <margn@internode.on.net>
To: benwiswall@pacbell.net; medit plants forum <medit-plants@ucdavis.edu>
Sent: Tuesday, July 14, 2009 10:48:25 PM
Subject: RE: Converting a swimming pool into a cistern

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
Sent: Tuesday, 14 July 2009 3:39 AM
To: medit plants forum
Subject: Converting a swimming pool into a cistern

 

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

Simi Valley , inland southern California



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