At this sinkhole, about 500 cubic feet of water per second is disappearing into the earth, the equivalent of an Olympic-sized swimming pool every three minutes, according to an engineer with the Edwards Aquifer Authority. For as much water reaches the aquifer at this spot, far more infiltrates through porous rock across South-central Texas.
Not all water runoff goes to rivers, lakes, and oceans. Some water percolates into soils that can absorb water (aquifers) but there are some soils such as clay that can’t absorb water (aquicludes or aquitards). In this dramatic example (see video), the water is not absorbed by the resistant rock, flows through a sinkhole to recharge the aquifer below.