Give an example of a non-rechargeable aquifer.

A confined aquifer is an example of a non-rechargeable aquifer because it is typically surrounded by impermeable layers of rock or clay that prevent water from easily entering or recharging the aquifer. This creates a situation where the water held within the confined aquifer is isolated from surface water sources, making it less susceptible to replenishment from precipitation or surface water infiltration.

In contrast, unconfined aquifers are more susceptible to recharge because they are directly connected to the surface. Water can seep down from the surface into the unconfined aquifer easily. Perched aquifers can also be recharged but are located above the main water table and are dependent on local conditions. Alluvial aquifers, often composed of sediments deposited by river systems, can also be recharged by water from nearby surface sources. Therefore, the characteristics of confined aquifers make them less likely to receive fresh recharge once depleted.