Wierman, Douglas A.Walker, JennaMoreno, Jaime2021-11-122021-11-122017-06Wierman, D. A., Walker, J., & Moreno, J. (2017). Pedernales Falls State Park spring dye trace project: Determining the source of the spring at Pedernales Falls State Park (Report No. 2017-06). Texas State University, San Marcos, Texas.https://hdl.handle.net/10877/14826The results of this dye trace study confirm that the source of the spring at the base of the falls at Pedernales Falls State Park (PFSP) is mainly a diversion of river water through a swallet or sink upstream of the park originating in the Marble Falls Formation. Continuous monitoring with a field fluorimeter, charcoal samplers and grab samples of water collected at the spring detected fluorescein dye poured near the area of the swallet. Dye breakthrough at the spring indicated a travel time of approximately 15.5 hours over a 2.4 mile distance.Text118 pages1 file (.pdf)enPedernales Riverstreamswater temperature analysisPedernales Falls State ParkEdwards AquiferReport