Using horizontal directional drilling (hdd), workers drilled the tunnel under the Ohio River in three weeks for the pipeline delivering GCWW water to Boone County and Northern Kentucky. They then used the drill to pull the pipe back through the tunnel.
Click on the link below to download an animation of horizontal directional drilling. The Cincinnati/Boone County installation consists of 3,000 feet of 36-inch welded steel water main tunneled through glacial outwash sand 25 to 40 feet below the Ohio River bed.
ISCO Industries - Horizontal Directional Drill Animation
Click on the link below to download a narrative on the horizontal directional drilling process.
J.D. Hair & Associates Inc. - Horizontal Directional Drill Process
