Groundwater is the water that is stored beneath the Earth's surface in aquifers, which are layers of rock or soil that can hold and transmit water.

Groundwater is primarily recharged through precipitation, which infiltrates the ground and percolates down to the water table.

The water table is the boundary between the saturated zone, where all pores and fractures are filled with water, and the unsaturated zone, where some pores and fractures contain air.

Unconfined aquifers are characterized by high permeability and porosity, allowing for rapid groundwater flow. They are not confined by impermeable layers above and below.

Groundwater discharge is the process by which groundwater moves from a higher elevation to a lower elevation, typically through springs, seeps, or wells.

Confined aquifers are characterized by being sandwiched between two impermeable layers, resulting in pressurized groundwater. This pressure can cause water to rise in wells above the level of the aquifer.

Transpiration is the process by which plants absorb groundwater and release it into the atmosphere through their leaves. This process contributes to the water cycle and helps regulate the Earth's climate.

Perched aquifers are characterized by their small size and are typically found above the main water table. They are separated from the main aquifer by an impermeable layer.

Groundwater discharge is the process by which groundwater moves from an aquifer to the surface, typically through springs, seeps, or wells.

Artesian aquifers are characterized by their ability to store and transmit large quantities of groundwater. They are confined between two impermeable layers, resulting in pressurized groundwater.

Infiltration is the process by which water moves from the surface into the ground. This process is essential for groundwater recharge.

Confined aquifers are characterized by their ability to release water slowly and steadily due to the presence of impermeable layers above and below.

Interaquifer flow is the process by which groundwater moves from one aquifer to another. This can occur through fractures, faults, or other geological features.

Semi-confined aquifers are characterized by their ability to store and transmit water, but at a slower rate compared to other aquifers due to the presence of a partially impermeable layer above or below.

Groundwater withdrawal is the process by which groundwater is extracted from an aquifer, typically through wells or boreholes.