Making the Tap: A New Deep Water Intake for the City of Austin's Water Treatment Plant No. 4

摘要

The City of Austin's Water Treatment Plant No. 4 (WTP4) is one of the few large scale deep water intakes in the nation. The tap into the lake was completed in 120 feet of water with a 12.5 diameter intake shaft 85 feet deep and a fabricated steel riser pipe, which was subsequently connected to a 9 foot diameter tunnel. Prior to completing the tap, a series of probing and pressure grouting operations were performed inside the tunnel. This tap was recently completed as planned and this paper will present a case history of this challenging and very successful project.