Groundwater and aquifers notes

What is groundwater?

Groundwater is water that fills the cracks and spaces in underground soil and rock layers.

Define aquifer.

An aquifer is a geological formation that can store and transmit water, supplying wells and springs.

True or false: Aquifers can be depleted.

True, because excessive withdrawal of water can lower the water table and reduce aquifer levels.

Difference between confined and unconfined aquifers?

Confined aquifers are trapped between impermeable layers, while unconfined aquifers are directly open to the surface.

What is the water table?

The water table is the upper surface of the saturated zone in an aquifer, where soil is fully saturated with water.

Fill in the blank: Recharge area is where __________.

water infiltrates the ground and replenishes aquifers.

What is well water?

Well water is groundwater that is accessed through a drilled or dug well, often used for drinking and irrigation.

Define the term 'porosity'.

Porosity refers to the percentage of a material's volume that is made up of pore spaces, essential for groundwater storage.

True or false: Aquifers can be both natural and artificial.

True, because aquifers can form naturally or be created through human activities like water management.

What is an aquitard?

An aquitard is a layer of soil or rock that restricts the flow of groundwater, often acting as a barrier.

Difference between impermeable and permeable layers?

Impermeable layers do not allow water to pass through, while permeable layers permit water movement.

What is groundwater pollution?

Groundwater pollution occurs when harmful substances contaminate the water supply, often from industrial or agricultural activities.

Fill in the blank: The main source of groundwater recharge is __________.

precipitation, which infiltrates the soil.

How does urbanization affect aquifers?

Urbanization can reduce groundwater recharge by increasing impervious surfaces, leading to runoff.

What is a spring?

A spring is a natural discharge of groundwater that flows to the surface, often forming streams or ponds.

True or false: Groundwater is our largest source of freshwater.

True, because about 30% of the world's freshwater is stored underground.

What is a drawdown?

A drawdown is the lowering of the water level in a well due to pumping, affecting surrounding water levels.