I have a plastic water cistern/reservoir (cubic shape, 1000 liters or
250 gallons) and I would like to install it on 4 vertical wood
pillars, 4x4 size, at 7-9 ft height.
I need some suggestion about the structure in wood to construct in
order to be secure. Is this size (4x4) able to sustain the full
reservoir? What kind of simple wood structure should I build in order
to be secure. How many pillars, how to fix the pillars one to the
other, supplementary reinforce, etc.
The cistern is not very heavy when is empty (less 50 kilos).
Well it will be heavy when filled. Water weighs roughly 8.5# per gallon.
Cross bracing in is order and it should reinforce the 4x4s to keep them
straight. That's a small foot print for the height. Why not on the
ground and a small pump?
I would like to use the fall of the water (no cost) instead of using a
pump with extra cost (each time I need water the pump should start,
The water is usually used for water the garden.
Unless you use drip irrigation, you won't get the water moving under
much pressure with gravity alone. And let's see.... 8.5* 250!25# plus
the weight of the tank, 50# you say although it might be more,
especially if it has metal bands around it.... and that's 7-8' high on a
foot print of 4'x4' making it extremely top heavy while on a straight up
set of legs. They better be in the ground more than a bit and not able
to move or twist.
A small utility pump that is gravity fed from the tank that you'd be
able to carry around easily might be a good choice, especially for the
little bit it would cost to run it. It would also look better but, I'm
not usually one for looks over practical, it's more practical, better
pressure and neat when you take up the hose you move the pump inside. Or
build a little housing for both the hose and pump next to the tank or as
a support for the tank. You can buy a lot of electricity with the money
you save by not buying the posts etc..
And how does the water get into the cistern, may I ask? Are you pumping it?
If so, the net expenditure of power is exactly the same, except for some
small losses. It's called conservation of energy.
Apart from that, balancing a ton 9 feet in the air is tricky business, as
others have pointed out, and it isn't going to look very nice either. Of
course they do this sort of thing all the time in Mexico. But four 4x4
posts set 2.5 feet deep on some nice flat rocks and then concrete around
them with some good X bracing will certainly carry the load, barring an
earthquake. You should brace zigzag fashion, i.e., two X's on each of the
four sides. And even so, if someone drives into this monument with a
pickup, he or she could be killed.
On Wed, 16 Jul 2003 14:09:15 -0400, "donald girod"
I don't hava a well on my yard, I take the water from a spring at 2 km
from the my little farm, with a 12v submersible pump (car battery). I
fill the water in 2 small tanks (on my mini van), care it with my car
to the farm and then with the same pump I fill the cistern.
Indeed, the process is very strange... but the water is necessary and
to make a well I should pay 1/4 of the price of the little farm!
The farm is used just during the summer/fall time, so during the
winter the cistern is empty.
I use the water for water the small garden. Now the cistern is at 1
(one) meter from the ground, enougth for this purpose, but I would
like to gain a little pressure of the water.
Usually I fill the whole cistern one per week and the water is
sufficient for all the week...
The cistern is closed to some pines and I could fix the "monument" to
be protected from going down.
Supposing I should use a pump (another or the same), what solution
should I use to have water all the time I need? An electrical device
(could be also incorporated in the pump) should start and pumps the
water from the cistern. But this kind of pump is expensive also.
I think there a number of alternative energy solutions at reasonable prices
ShurFlo makes inexpensive($80) 12v pumps with built in pressure switches.
Not a lot of flow, about 2 gallons/minute. Google is your friend.
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