Investigations for horizontal directional drilling (HDD) - Three SE Queensland case studies

The Parsons Brinckerhoff Brisbane office has been involved in three major horizontal directional drilling (HDD) projects for water and wastewater infrastructure in south-east Queensland for local government clients.

Three case studies illustrate the methodology developed for the geotechnical investigations and preliminary design for HDD projects, and highlight the key issues to be addressed in the preparation of AS 4300–1995 General Conditions of Contract for Design and Construct tender documents. The three case studies are:

1. Australia TradeCoast Sewerage Project (Brisbane), Brisbane Water

 750 m long x OD400 PN20 HDD crossing under the Brisbane River from Lytton to Pinkenba for a sewerage rising main to transfer sewage from the Lytton Road pump station to the Serpentine Road pump station

2. Coochiemudlo Island Wastewater Project (Redland Bay), Redland Water & Waste

 1,100 m long x OD180 PN16 HDD crossing under Moreton Bay from Coochiemudlo Island to Victoria Point for a sewerage rising main that transfers sewage from the island to the mainland’s gravity sewerage system

3. Granville Trunk Water Main Project (Maryborough), Maryborough City Council

 330 m long x OD400 PN16 HDD crossing under the Mary River to strengthen the water supply capacity to the Granville area.