[Greenbuilding] Greenbuilding Digest, Vol 56, Issue 10

[Dan Barry]

Thanks yes he septic tanks do seem promising as open tanks or ponds are
presently subject to mosquitos and evaporation.  Lots of wind on the
mountaintop here.
  the tank I visited was cement and enclosed completely under soil.  We
consume about 2000 gallons a month for the humans so we are doing well.
Thanks

On Sun, Apr 26, 2015 at 2:00 PM, <
greenbuilding-request at lists.bioenergylists.org> wrote:

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>    1. Re: Ferro cement or Plastic water tanks (John Salmen)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 25 Apr 2015 22:41:40 -0700
> From: "John Salmen" <terrain at shaw.ca>
> To: "'Green Building'" <greenbuilding at lists.bioenergylists.org>
> Subject: Re: [Greenbuilding] Ferro cement or Plastic water tanks
> Message-ID: <010601d07fe3$ac94a1b0$05bde510$@ca>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Dan,
>
>
>
> Funny was just talking about rainwater collection today and
> storage/overflow issues - just looked at some figures from the last
> project. I live in a wet place with dry summers so the problem is always
> adequate storage for the dry period and how to deal with overflow in the
> wet period without concentrating flows and erosion problems, etc.
>
>
>
> Roof area was about 2800 sq. ft. and roof flows would be approx. 76,000
> gallons a years.  with actual requirements about 28,000 gallons a year.
> Storage is generally based on getting through the dry months which here
> requires a minimum of 5000 gallons with actual monthly storage requirement
> being about half of that.
>
>
>
> So storage is one issue ? end water quality is another which generally
> requires some forms of filtration ? rough down to fine particle and then
> typically some kind of bacterial treatment uv or media. Typically
> filtration is the overriding design/cost consideration.
>
>
>
> For storage an open pond is the simplest method that can deal with both
> storage (including dry period storage) and overflow requirements but is
> highly dependent and demanding on well designed filtration ? but keep in
> mind that filtration has to be there in any event.
>
>
>
> Next simplest is stock concrete water tanks or modified concrete septic
> tanks provide quite clean storage and can be used in tandem with a pond for
> minimizing filtration requirements during wet months ? drawing from the
> pond during dry periods. I like concrete tanks as they can have drive on
> lids (as part of a driveway or deck) or be the foundation for an
> outbuilding.
>
>
>
> Since both storage and filtration was needed the system I ended up
> designing for that project combined storage with filtration using both a
> roughing filter and a slow sand filter built into concrete tanks as both
> the filter and storage system. Basic idea being that both the roughing
> filter and slow sand filter containers could contain a large volume of
> water (depending on sizing) which could flow to a daily usage tank. Water
> would be drawn directly from roof or pond depending on flows. Since such
> systems are dependent on some bacterial content the pond can work.
>
>
>
> Best ponds are clay or mulch based but can take a some time to establish.
> An immediate pond can be made with an epdm liner.
>
>
>
> I have also been looking at vertical storage (well casings) for small
> properties but am concerned about aquifier contamination with depth of
> drilling for those ? seems invasive.
>
>
>
> Best
>
> John
>
>
>
>
>
>
>
>
>
>
>
>
>
> From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org]
> On Behalf Of Dan Barry
> Sent: April-25-15 9:34 AM
> To: greenbuilding at lists.bioenergylists.org
> Subject: [Greenbuilding] Ferro cement or Plastic water tanks
>
>
>
> As a resident of Leander Texas, we are very concerned with rainwater
> preservation.  35,000 gallons of storage will overflow if you trap all
> water off a 2500 sqfoot house(3 times a year for a Pfieffer designed house
> ICF built on Brown Bluff).
>
> Can I unleash to the engineer types for green impact of:
>
> -plastic blown tank
>
> -metal sides with epdm liner (called Austrailian style up here)
>
> -ferro cement, meaning  lots of rebar and wire lath and labor
>
>
>
>
> -- thanks
>
> Dan Barry
>
> the humans currently consume 2000 gallons every 1.5 months from our
> plastic cistern.  Yes we are going to full rainwater while we do
> reconstruction later this year.
>
>
>
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> End of Greenbuilding Digest, Vol 56, Issue 10
> *********************************************
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-- 
Dan Barry
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