List all of the types and locations of stream pollution you noted during the field trip. The City of Austin has built the main sewer lines along the creeks whenever possible. Yet, there were also times when the waters were shallow and dinosaurs waded around in our region. Pilot Knob, an ancient volcano off the Locl,,hart Highway south of Bergstrom Air Base, rose above the sea, belching smoke, ash, and lava. The land was not still in that time, nor is it still todav.
High land is worn low and flat, and old flat land is raised upward to form new hills or mountains.
Austin is now what was once the bottom of the sea. What we are concerned with is what happens to this sea floor when it becomes high ground and when wind, rain, and man begin to work on it. When it rains, a part evaporates and returns to the air. The remainder, which flows downhill on the surface of the ground via small gullies, or via city storm drains, is the main water supply or the stream. Often, during very dry weather, a stream will not have enough water coming in from its watershed, and it will become a dry, rock stream bottom.