If your lawn has fertilizer and pesticides on it, these will reach the creek too. If there are chemicals or litter dumped in the stormdrain, it will not get filtered out. These pollutants will then move with the creek into the lake or river where your creeks drains. Our lakes and rivers then drain into the Colorado River watersheds and travel to Matagorda Bay. An underground layer of permeable rock that contain large pockets of water.
Water enters the aquifers where the rock layers are exposed to the land surface.
In Austin, water enters the aquifers through faults, sinkholes , caves, and other recharge features to fill the huge underground water supply. The University of Texas has an online map of Major Texas Aquifers . View 'Our Aquifers' brochure . The Edwards and Trinity Aquifers are the main aquifers in the Austin area. The Edwards Aquifer is a karst aquifer made up of porous, permeable limestone which runs from north of Austin through the San Antonio area and west toward the Rio Grande.