I'm building a little pond [8x12 or so] & have been toying with the
idea of making a geyser adjacent to it. It doesn't have to be huge
and dramatic- a 1 foot spurt/gurgle every minute or two would make me
I'd like to hook it into a branch line off the same pump that will be
filtering/circulating the water. It is a 2000gph, low pressure,
pump. Pipe will be 1 1/2" PVC. [is there any way to calculate water
pressure when all you know is it will push 16' of head and the top
rating is 2050gph?]
I was thinking of a very low pressure pressure-relief-valve- but then
realized that the pressure would be fairly steady. So I need to
figure out some [simple] way of gradually increasing pressure on an
isolated line, then releasing it.
Or should I just go with a separate little pump and a timer?
That would be an energy hog though, those pumps use a tremendous
amount of electricity
to start, then drop back to rated.
If I were doing it I would use a couple of electric valves or a 3 way,
and put that on a timer.
Then the filter discharge would be cut off & redirected to the geyser.
You would need enough pressure at all times to
run the geyser. If the water is relatively clean, sprinkler valves
would work, cheap and easy to work with. You would just need a
low voltage circuit for the timer & it could be all ac, so a doorbell
transformer would work.
Check with the pump people online. They may have: a pump with variable
pressure and a timer, or suggestions for a second pump and how to calculate
and do it.
Remember, too. You can get a lot of pumps cheap at yard sales, salvage
places, and spa repair shops. For what you want to do, I'd consider going a
cheap way, then replacements are easier. Plumb for it with removable
Maybe you could rig up something that slowly fills a bucket and mount
the bucket so that it loses balance and dumps all at once when nearly
full. The bucket full of water would flow through a pipe that leads
to the base of your geyser. The bucket would have to well above the
rest of the system, but maybe you are lucky enough to have a place to
hide it. The bucket would right itself after dumping and begin to
fill again. (One of those old toy drinking birds comes to mind).
Here's a kit "Geyser Garden Fountain Pond Kit". I haven't used one,
but look at the small "geyser"(pic).
This would be constant and not have a timer, unless you added that.
Depending on what's nearby.....
Old time flush toilets used to have the tank mounted high on the
wall. You could rig up an elevated tank with a large diameter
discharge tube. When the tank filled, the inner works could "flush"
the tank, sending a large volume of water down the pipe to the
fountain. The drawback would be the pressure necessary from a low-
volume pump to get water to the tank.
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