Waterborne Self-potential, Temperature, and Conductivity Logging Data from the Elm Fork of the Trinity River between Lewisville Lake Dam and Frasier Dam Recreational Area, January 2022.

This data release contains waterborne self-potential (WaSP) and surface-water (SW) temperature, conductivity, and specific conductance data measured by the U.S. Geological Survey (USGS) along a 43.2-kilometer (km) long profile in the Elm Fork of the Trinity River upstream from the Dallas, Texas, metropolitan area. The WaSP data were measured from a kayak during January 25–27, 2022, along three survey segments between Lewisville Lake Dam and Frasier Dam Recreational Area. The first segment was surveyed on January 25, began a short distance downstream from Lewisville Lake Dam, and ended about 19.2 river-km downstream, a few meters upstream from Carrollton Dam in McInnish Park. The second was surveyed on January 26, began at McInnish Park, a few meters downstream from Carrollton Dam, and ended about 15.3 river-km downstream, a few meters upstream from California Crossing Dam in California Crossing Park. The third segment was surveyed on January 27 and began a few meters downstream from California Crossing Dam and ended about 8.7 river-km downstream in the Frasier Dam Recreation Area. WaSP voltage data contained in this data release were continuously logged at a period of 1 second per measurement along each of the three survey segments by using an Agilent U1252B data-logging multimeter (Agilent, Santa Clara, California, https://www.agilent.com) and a 0.55-meter long electric dipole comprised of two freshwater-submersible, non-polarizing copper-sulfate electrodes. SW temperature and conductivity data were continuously logged at a period of 2 seconds per sample with an Onset HOBO (Onset, Cape Cod, Massachusetts, https://www.onsetcomp.com) conductivity and temperature logger. The WaSP data were monitored in real-time as they were measured and logged, and locations where electrical noise was observed in the data were recorded by a handheld GPS with a horizontal accuracy of about 2–3 meters. Four electrode-drift tests were performed to record the drift characteristics of the WaSP electrodes during data collection along survey segments. Geospatial coordinates of the measurements were recorded with a horizontal accuracy of about 10 centimeters (cm) and a vertical accuracy of about 20 cm by logging output from a Trimble DSM232 differential GPS (Trimble Geospatial, Sunnyvale, California https://geospatial.trimble.com). Streamflow hydrographs at three USGS streamgages installed along on the survey reach are included and cover the time period of the WaSP survey. The combined datasets contain 46,364 measurements of WaSP voltage in the SW and 26,943 measurements each of SW temperature, conductivity, and specific conductance, and the geospatial coordinates of each measurement.

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  "geospatial"
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