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RE: pool wall design

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I spoke to a local pool contractor about pressure relief valves, and 
he says, when he is doing pool maintenance, he always removes the 
valve, as often they don't work for various reasons.
Garu Hodgson

On 14 Nov 2003 at 10:10, Jim Persing wrote:

> It has been a while since I have designed pools but there is some
> criteria out there regarding the slope at which support is considered
> -- 20 or 30 degrees or so.  This makes the weight of the wall acting
> as part of the outward cantilevered moment.  Support of the water
> pressure is assumed to be directly against the soil except for the top
> 2 or 3 feet and that has to be cantilevered for water pressure out
> (construction removal of the soil and inadequate re-compaction).  A
> bond beam needs to be at the top and it has to be able to span across
> the width of the equipment access trench to dig the pool (8 or 10
> feet).  Expansive soil applies more pressure for the cantilever part
> of the wall and should be considered.
> A "floating" pool (no lateral soil support) is a whole different
> thing.  A pool supported on piles is a real challenge.
> A hydrostatic relief valve should be installed in the deep end so that
> any water pressure when the pool is empty will just fill the pool and
> equalize the pressure.
> Probably local construction conventions will dictate the size and
> spacing of rebar but usually it is somewhat close at the bottom and is
> cut off part way up.
> You should check regulations for depth when there is a diving board
> and be sure you are covered there.  You should also have structural
> details for the light box and filter boxes.
> This information is about 20 years old and there may be some other
> things that I have forgotten to include.  If you are only going to do
> one or two (see Stan's post) I would recommend that you don't do it. 
> If you are going to do lots of them then it is worthwhile to do a lot
> of checking first and make up your fee on the repeat ones.
> If you get into the mechanical aspects, i.e. size of pumps, etc. be
> sure to do your homework because there are limitations and
> restrictions.
> Jim Persing
> -----Original Message-----
> From: Pat Clark [mailto:bcinc(--nospam--at)]
> Sent: Thursday, November 13, 2003 10:21 AM
> To: seaint(--nospam--at)
> Subject: pool wall design
> I am looking for additional references on designing pool walls.  We
> have started by analyzing these walls as cantilevered retaining wall,
> but this does not consider the curvature at the bottom of the pool,
> and additional hardened overcoats on the pool walls, etc. Also, any
> input for my specifications about leaving pools in a drained
> conditioned, etc. would be greatly appreciated.
> <?xml:namespace prefix = o ns =
> "urn:schemas-microsoft-com:office:office" />  
> Patrick Clark, P.E.
> Building Concepts, Inc.
> <?xml:namespace prefix = st1 ns =
> "urn:schemas-microsoft-com:office:smarttags" />1228 Pep Circle
> Gardnerville, NV 89410
> (775) 782-8886 x22
> (775) 782-8833 fax

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