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Prabhahari
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How to pull up the water which is 800 feet below the ground? How much amount of pressure to be applied ?
Can we use P = dghReply me as early as possible?
Can we use P = dghReply me as early as possible?
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That is wishful thinking. You are very lucky to be living in an area where, when you dig a hole, it fills up with water. My water table is at 90m. I am only 100m ASL, but 10km inland.Chestermiller said:water will fill the casing,
Baluncore said:That is wishful thinking. You are very lucky to be living in an area where, when you dig a hole, it fills up with water. My water table is at 90m. I am only 100m ASL, but 10km inland.
Poorly fractured rocks have very low flow rates, it may be necessary to pump the water level down as far as practical below the natural water table in order to have sufficient flow.
A water well is usually bored to a depth that is 20 to 50 feet below the water table. That is because you only stop drilling when you get sufficient water flow, or run out of money. It is unlikely that a hole with a total depth of 800 foot would be bored if the water table was anywhere near the surface. That would be a waste of tens of thousands of dollars.
I'm sure that you are aware that, if you have a hole down to 800 feet, the hole won't be dry unless the water table is at least 800 ft below ground level. Are you aware of any geological settings like this, other than on the side of a mountain? I guess I did make the tacit assumption that the water table is not hundreds of feet below ground level.Baluncore said:Chestermiller. I believe we differ in our extrapolation from the OP question.
You are assuming the hole is full of water, but that the OP only wants to sample water from the 800 foot level.
My assumption was that the hole is dry above the pump at 800 feet, hence the deep hole and pressure problem.
You can not pull it up like that. Capillary force (used by high trees!) may work, but it's very slow.Prabhahari said:How to pull up the water which is 800 feet below the ground? How much amount of pressure to be applied ?
Can we use P = dgh
Reply me as early as possible?
Define mountain.Chestermiller said:Are you aware of any geological settings like this, other than on the side of a mountain?
meBigGuy said:A lot of talk but no one has answered the simple question. How much force is required to pump water up from 800 ft. Frame the scenario any way you want to allow an answer to that question. Assume a 800ft water table.
Baluncore said:You cannot pull it. You have to put the pump down the hole, then pump the water out. Each 30 feet of water is about one atmosphere. 800 / 30 = 26.66 atm = 387 psi.
That is about 2 foot per psi.
The water column is the vertical distance from the surface of a body of water to the bottom. It is typically measured in feet or meters.
The pressure in the water column increases with depth due to the weight of the water above. For every 33 feet (10 meters) of depth, the pressure increases by 14.7 pounds per square inch (psi).
The deeper the water, the higher the pressure. This is because the weight of the water above increases with depth, causing an increase in pressure on the water below.
Water pressure in the water column is typically measured in units of force per unit area, such as pounds per square inch (psi) or newtons per square meter (N/m²).
The pressure in the water column can have a significant impact on marine life, as it can affect their ability to regulate their internal pressure and buoyancy. Some species have adaptations to withstand high pressure, while others may only live in specific depth ranges where they can survive the pressure changes.