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Thread: Angle of Repose

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    Angle of Repose

    Hello,

    Can anyone give me some guidance or thoughts on installing a pool 8' from my house? My house has a poured concrete basement and the walls are probably 10' high. I am thinking fiberglass may not be the best option as the pool walls are not self supporting and could push out and cause damage to my foundation. Also, there is something called an angle of repose and I think this will need to be considered regardless of fiberglass or gunfire.....anyone understand this enough to explain it?

    Thanks,
    Doug
    13,500 Gallon Gunite Aggregate Finish, DE, SWG, 2.0 HP pump, 1.0 HP pump for 3 Sheer Descents

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    Re: Angle of Repose

    It would probably be best to have a professional engineer give you an opinion based on an on-site evaluation.

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    chiefwej's Avatar
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    Re: Angle of Repose

    As said you need an engineer to look at it, but basically a 45% angle from the base of the pool wall. I added a support pier for a porch addition and it had to be placed along side the pool shell at a minimum distance equal to the depth to the outside bottom of the pool.

    Oddly enough though I have seen pools that were approved by our local building dept placed very close to retention walls.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: Angle of Repose

    Chiefwej,

    Can you give me some more details? If I take a 45° angle from the bottom of the pool side that is closest to the house.....does the angle head up towards the roof or below the footings of the basement.

    Thanks,
    Doug
    13,500 Gallon Gunite Aggregate Finish, DE, SWG, 2.0 HP pump, 1.0 HP pump for 3 Sheer Descents

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    chiefwej's Avatar
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    Re: Angle of Repose

    In my case it was both. The distance between the two structures had to be at least equal to the maximum depth of the deepest.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Mod Squad Bama Rambler's Avatar
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    Re: Angle of Repose

    You need to have a local civil engineer look at it. The angle of repose depends on the local soil. If your soil is clay and stone the angle of repose is pretty steep but if it's sand or sandy loam it's very shallow.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Angle of Repose

    I talked to a professional engineer (PE) today. She was incredible and she spent a good 15 minutes on the phone with me today. It sounds like she is ok with the pool being 8' from the house based off of the pool bottom being 2 to 3 foot higher from my basement floor. She also used to design pools so she has experience so it seems. Her main concern was if the pool ever leaked and the horizontal pressure that is created.

    She gave me the confidence that I can proceed. I am going to hire her once I pick out either fiberglass or concrete and a pool size/pattern. Sounds like she'll cost me $300.....well worth the peace of mind. I'll get papers and she'll come out see my situation first hand.
    13,500 Gallon Gunite Aggregate Finish, DE, SWG, 2.0 HP pump, 1.0 HP pump for 3 Sheer Descents

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    Mod Squad Bama Rambler's Avatar
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    Re: Angle of Repose

    You definitely made the right choice.

    There's nothing like getting a local professional in iffy situations.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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