True-true; this is one way of using the same groundwater again and again. sure, it costs money and takes time to do this, but if the groundwater is valuable enough (probably because enough surface water is scarce) it may makes sense to artificially inject groundwater back into the same aquifers it came from for use on another day.
in places where the water table is close to the land surface and where water can move through the aquifer at a high rate, aquifers can be replenished artificially. for example, large volumes of groundwater used for air conditioning are returned to aquifers through recharge wells on long island, new york. in orlando, florida, water is spread across small basins, sinks into the ground, and recharges the shallow surficial aquifer to be used for irrigation of local citrus crop fields.