The Letter 'T':  TMDLs and Impaired Water Bodies  Transpiration: The process by which plants release water that has been taken up through their roots into the atmosphere. Transpiration occurs through the leaf pores of plants (Also called Evapotranspiration).  Tributary: A stream that flows into a larger stream, river or other body of water. *     *     *     SURFRIDER and the SURFRIDER LOGO are registered service marks of Surfrider Foundation Copyright © 2002 Surfrider Foundation All rights reserved