Lake Travis—Water Intake Tunnel City of Austin Austin, Texas One Raw Water Intake Shaft, 12.5 ft Diameter, 231 ft deep. Installation procedure included the placement of a 195 ft long, 13 ft diameter temporary steel casing through 99 ft of water and sealed into rock. The 80 ft deep rock socket was removed using reverse circulation drilling techniques. Owner: City of Austin, Texas Contractor: Obayashi/Manson For

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