Thiem equation

What is the well function?

Storativity is the addition or release of water to the storage space due to the increase or decrease of hydraulic head, while transmissivity is a function of the hydraulic conductivity and the thickness of the aquifer and descibes how easily the aquifer moves groundwater through its pore spaces.

What is a pumping test?

A pumping test consists of pumping groundwater from a well, usually at a constant rate, and measuring the change in water level (drawdown) in the pumping well and any nearby wells (observation wells) or surface water bodies during and after pumping (see Figure 1).

How many observation wells are required for a comprehensive aquifer test?

three observation wells

What is a partially penetrating well?

A well in which the screened portion through which the water enters the well does not penetrate the full thickness of the formation.

What is residual drawdown?

When the pump is shut down after a pumping test, the water level inside the pumping and observation wells will start to rise. This rise in water level is known as residual drawdown (s’).

What is a drawdown test?

A drawdown test is one in which the rate is held approximately constant while the well pressure is measured. Shut in the well till pressure reaches static level and then flowing the well at a constant rate ,q & measuring Pwf. Advantages. Suitable in new wells.

How do you conduct a pump test?

The basic principle of a pumping test is that if we pump water from a well and measure the pumping rate and the drawdown in the well, then substitute these measurements into an appropriate formula and calculate the hydraulic characteristics of the aquifer.

What is recuperation test?

Recuperation Test: In this method water level in the well is depressed by pumping to any level below the normal level. Then the pumping is stopped and time taken by the percolating water to fill the well to any particular level is noted.

What is well hydraulics?

Well hydraulics is a discipline to understand the process of flow to the well in an aquifer which is regarded as a source of groundwater.

How does cone of depression form?

A cone of depression occurs in an aquifer when groundwater is pumped from a well. When a well is pumped, the water level in the well is lowered. By lowering this water level, a gradient occurs between the water in the surrounding aquifer and the water in the well.

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