Case Study - Lacustrine: Underwater Resistivity Surveys

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Courtesy of Advanced Geosciences, Inc.

Lake Travis – Austin, Texas

Objective:  Locate buried pipeline and map the limestone bedrock surface

Site:  Lake Travis, near Austin, Texas USA during the AGI Marine Resistivity Seminar

Date:  May 1, 2014 and May 7, 2015

Instrument:  SuperStingR8 WiFi, SwitchBox56, underwater marine cable with 28 electrodes spaced at 6m.

Software:  EarthImager 2D underwater resistivity inversion model incorporating bathymetry and water conductivity data

Result:  Underwater resistivity imaging mapped the limestone bedrock and located the City of Cedar Park, TX water supply pipeline.

Additional Details:  The exact location of a water supply pipeline was found in an unmarked location of the lake with the SuperStingR8 WiFi and underwater marine cable.  The pipeline design is steel with a 72 inch (~1.8m) diameter that can provide 20 to 25 million gallons of water per day (MGD).  Additional information regarding the surrounding limestone and weathered limestone was also imaged.

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