# Could this be possible? water underground

I have some question, if the tube being suctioned could it lift the water underground?

Could it able to sustain the flow of water in the tube, by just its own pull continuously?

I know it sound crazy you, do you think this is possible? TIA

#### Attachments

• 15.7 KB Views: 298

Related Other Physics Topics News on Phys.org
Dale
Mentor
Sure. This is how many wells work.

I have some question, if the tube being suctioned could it lift the water underground?

Could it able to sustain the flow of water in the tube, by just its own pull continuously?

I know it sound crazy you, do you think this is possible? TIA
This is the principle utilised by bore wells all over the world. Nothing crazy about it.

russ_watters
Mentor
Note though that the suction head is limited to about 10m by air pressure (minimum vacuum). Larger wells need the pump at the bottom.

Note though that the suction head is limited to about 10m by air pressure (minimum vacuum). Larger wells need the pump at the bottom.
Russ i thought about this too but I'm not sure if the atmospheric pressure is directly or continuously acting on the water table. Maybe it would be much less than 10m head. Any insights?

Khashishi
I would think it is more. Certainly the pressure in the earth is higher than the pressure in the atmosphere.

I would think it is more. Certainly the pressure in the earth is higher than the pressure in the atmosphere.
That pressure has already been utilised when the well has filled up naturally to a certain height. It's about the additional pump required to pump it from that free surface depth.

russ_watters
Mentor
You are both potentially correct. It depends on the geology if the water is under additional pressure or not. That's what happens with springs and artesian wells, not to mention oil gushers.

But for the typical open-above well, with a pipe that does not seal the well sides, the height is referenced from the water level and the head referenced to atmopheric.

thanks again

any suggestion guys? if this 10 m air space in tank, could vacuum the water from under ground, if i let open the valve? could it carry water from the ground up to the water tank? since the water in the tank has pressure to suction the water under ground. correct me if am wrong :) :) :)

TIA :)

Dale
Mentor
10 m is about the maximum. It would require vacuum in the tank instead of atmospheric pressure.

Last edited:
anorlunda
Staff Emeritus
The 10 m limit comes because the water at the bottom will begin to boil if the absolute pressure approaches 0 PSIA.

Chestermiller
if this 10 m air space in tank, could vacuum the water from under ground, if i let open the valve? could it carry water from the ground up to the water tank? since the water in the tank has pressure to suction the water under ground.
No. What you're proposing would be a perpetual motion machine. Look at the pressures in the tank and the riser from the ground and convince yourself that it is not possible.

Chestermiller
Mentor
The 10 m limit comes because the water at the bottom will begin to boil if the absolute pressure approaches 0 PSIA.
Yes. The pressure at the water table, of course, is 1 atm.

Chet

10m is the theoretical limit at 1atm. Practically vapour locking will cause a loss of suction much earlier. Think maybe 7m in reality.
Though I'm getting the suspicion you are after a perpetual motion machine.

russ_watters