[Ferro List] Swimming pool/Expansive soil

[Kosta Dellios]

Hi Christopher,

Thanks for all the advice. 

On Jan 15, 2008,  Christopher Glasspool wrote:
>the top of the pool and the deck should
 form one piece to create as dry an area as possible under the >pool.
 Starting at the top, the deck or lip, and top of pool should be slightly
 higher than the immediate >area with a drainage tile or gutter taking away
 any splash and storm water away from site. 

I will probably use panels that I prefabricate and then pour a "collar" around the pool together with the concrete deck around the pool. This will be done in one operation.  I'll take your advice and have the pool slightly raised and have the water run down towards a gutter that will transport any water to my storm water tank. 

On Jan 15, 2008,  Christopher Glasspool wrote:

>The vertical sides of the pool will have drainage mat, aka Enkadrainage
 or Enkamat under the sides >which drain water down to the bottom. 

Will this really be necessary?  Wouldn't the water run down the vertical sides of the pool anyway? I thought products like these were used on concrete foundation walls so that they don't come in contact with the water and thus transport humidity.  But since its a pool and not a basement I guess it doesn't matter?  Or is it still beneficial to use them? 

On Jan 15, 2008,  Christopher Glasspool wrote:

>The
 bottom will have gravel with enough drainage tile (poly tubes with
 slits) that can leave the total area >equally damp/dry. Draining this total
 bottom gravel area away from the pool site, and if that isn't >feasible
 than a over kill of dry wells (french drains) are set around the
 perimeter.

I will use a gravel bed on all the bottom of the excavation (larger the the pool size).  But I'm perplexed how I will be able to incorporate the drainage tile in a good fashion.  The problem is that my pool design will have different depths.  Its not a gradual incline but an inversed pyramid in the deep part, then a flat 1.5m deep area and finally a more shallow area.  Any idea on how I would install the drainage tiles in this design?  Since I am on flat land I'll also need to incorporate some sort of sump pump on the deepest part that will take away any water. Or is it enough to install one of those special pool valves that releases the water into the pool when the water pressure under the pool is high?

On Jan 15, 2008,  Christopher Glasspool wrote:

>Along with the drainage mat and drainage tile, may need a silt barrier
 between these things and the soil >to stop them from eventually filling
 up with clay particles. I'm not sure of this, but you can find out from
 >the vendors, and local contractors, engineers and inspectors, etc.

I know they use geotextile over here for wrapping drainage tiles.  Is this what you mean or do you mean some sand layer over the gravel? 

Cheers,
Kosta






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