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Re: Swimming Pools

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Those one way valves can fail. My brother's did when the pool people came to clean the pool in the spring. They left it empty over-night and there was a heavy rainfall. The r/c pool rose 10" at one end and 5" at the other end. It setteled back over several days about 5" at the worst end and 2" at the other.

raymond shreenan wrote:
When I designed my pool I used a bond beam around the top and considered hydrostatic loads on interior with pool full and no support from the soil and pool empty with saturated soil on the exterior. As a precaution I installed a 1 way valve in the bottom drain box that would remain closed when the pool was full but would relieve hydrostatic pressure if their was any when the pool was drained. My pool is also 9' at deep end and 4' at shallow end. Ray Shreenan
    ----- Original Message -----
    *From:* Thor Tandy <mailto:vicpeng(--nospam--at)>
    *To:* SEAINT <mailto:seaint(--nospam--at)>
    *Sent:* Thursday, January 29, 2009 8:40 AM
    *Subject:* Swimming Pools

    I'm doing a small residential pool (about 35'x24' sloping bottom
    from 4' to 9').  It's been awhile since I last did a fluid
    containing structure.  Is ACI 315 the correct standard or does
    anyone know an accessible detailing reference?  The primary
    structural design is not the issue.  I've usually taken care of
    crack mitigation and detailed accordingly but I might have
    forgotten something secondary but important.
Is it common/rare to design the top edge apron as supporting the
    walls, or should I stick with cantilevered walls?
Since it's in-ground, I'm assuming seismic is not an issue ...? Any other advice? TIA

    Thor A. Tandy P.Eng, C.Eng, Struct.Eng, MIStructE
    Victoria, BC

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