01

02

03

04

Geotech was engaged as a principal contractor to deliver the Tantagara Dam Outlet Modification project. Geotech’s innovative temporary works techniques enabled the modification works to be undertaken without draining the entire dam. Geotech was engaged to design, fabricate and construct a temporary cofferdam that mitigated the requirement to drain the dam. This approach helped safely contain and manage environmental hazards located at the dam floor by defining a sealed-off construction zone within the existing water storage. This innovative construction technique saved the project in the order of $3 million.

Disciplines covered

• Dam environmental preparation including, removal of potentially hazardous materials from the base of the dam.
• Supply and construction of a reinforced concrete outlet tower (35m in height) formed using 10 tonne pre-cast concrete sections.
• Construction of new outlet structure in the dam base.
• Supply and installation of all tower mechanical works (internal stainless steel shutter guides, shutters, trash racks, service stairs and platforms).