Inground Pools and Ground Water

Inground Pools and Ground Water


Jason: Hey, everybody. Jason here from River Pools. And today, we’re on location where we’re installing
one of our Cathedral 36 inground fiberglass pools, here in White Stone, Virginia, in the
northern neck of Virginia, which is all the way on the East Coast. We are very close to the Chesapeake Bay. In fact, we’re on a waterfront site today. And as you can see, we’ve excavated for this
pool, and what we’re gonna talk about today is how to install an inground pool in an
area with a high water table. Jason: So we’re on a waterfront lot, there’s
panoramic view, gorgeous site. But we’re not elevated very high above the
sea level here. And so we’ve excavated our hole, which is
about six feet deep or so. And you can see it’s very wet down here. This is sandy soil, which is pretty common
for areas with a high water table. And you can literally see the streams of water
flowing in front of me, so there’s quite a bit of ground water here. And this water is just seeping in from the
bottom, about 12 inches of this excavation, it’s seeping in through the sand. And what tends to happen when this goes on
is the sand starts to wash into the hole, then you start to get cave-ins. Jason: So it’s important that we do a couple
things. What we’ve done here as a treatment is as
soon as we got down to our depth, we installed a silt fence. And what that does, it allows the water to
pass through the silt fence, but it traps the sediment, so it doesn’t continue to wash
down in the hole. Jason: We also installed a submersible pump,
and once we got down to our excavated depth, we over-dug by about six inches or so, and
we installed gravel down in there, and we put that pump on top of the gravel. And then that pump’s constantly removing the
ground water, which is keeping this hole relatively dry so we can work down here until
we get the pool installed. Jason: We also started digging from the deep
end of the pool. And this allowed us, as we got down to our
depth here, to work our way back up. If we would’ve started from our shallow end,
the water would’ve continued to pool into the hole, and we would’ve constantly been
digging into soupy, sloppy dirt. So if you can, in areas where you think you
might hit ground water, start from the deep end first. Jason: So in essence, what’s gonna happen
next out here is now that we’ve got our hole dug and dried out, we’re gonna put our gravel
base down, we’re gonna set the pool in here, and the entire time this is happening, we’re
gonna have the submersible pump running to continue to keep the hole dry. So after we get the pool set, we’ll start
to fill it with water, we’ll back-fill with stone around the outside of the pool, and
we’ll keep that pump and our drain pipe after the pool is installed, and we’ll keep that
in there and let it continue to run until we get out concrete deck poured around the
outside of the pool. Jason: So this is how we treat high water
table situations. And we hope you’ve learned a lot from it. If you have any other questions, feel free
to let us know. And if you’d like to receive a quote for an
inground pool, be sure and make a request on the website here, and we’ll be in touch
with you very soon. Thanks so much.

2 thoughts on “Inground Pools and Ground Water

  1. I live in Michigan with a lot of clay around my inground liner pool. Have a 9 foot deep end in our pool and we constantly are draining water from behind the liner in the shallow 4' wnd with a 1-1/2" pvc pipe stuck behind the liner and connected to a pump in a corner of the liner I have pulled back. Would it be recommended or OK to install a permanent sump pit to drain water from behind the liner as a permanent fix? Thanks for any advice you can send.

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