What is a Riparian Area?
Riparian areas are the margins of streams, rivers and intermittent draws, where vegetation is strongly influenced by the presence of water.
The Benefits of a Healthy Riparian Area
Riparian areas perform key ecological functions that contribute to the health of the entire ecosystem. Nutrients, detritus, and water are transported into a riparian system from runoff. Riparian vegetation adjacent to rivers and streams serves as a major energy source for aquatic organisms while providing habitat for numerous terrestrial wildlife species. Trees provide shade and prevent wide fluctuations in water temperature, protecting aquatic wildlife from the harmful effects of climatic extremes. Stems and roots of riparian vegetation stabilize the soil by reducing water velocity and minimizing erosion.

The City looks to the experts for information related to stream riparian zones and stream ecology.
Below are links to websites discussing riparian zones and stream ecology:
Texas Riparian Association
Hill Country Alliance
Texas Water Resources Institute