In 2017, a Texas State University dye-tracing study followed fluorescein from the Pedernales River to a spring; the dye was detected 2.4 miles away in about 15.5 hours

Researchers used fluorescent dye to trace water flow in the Pedernales River. This experiment confirmed a hidden underground connection to a local spring. Water seeped into the ground and resurfaced miles downstream from its entry point. The study demonstrated how rivers can seemingly disappear and reappear in Texas Hill Country. This finding helps understand groundwater and surface water interactions during droughts.
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