All go at Googong Dam

摘要

The Googong dam is a 66m high zoned earth and rock-fill embankment on the Queanbeyan river in New South Wales, Australia and is one of the main water supply reservoirs for the Australian Capital Territory (ACT) and surrounding region. The dam has an ANCOLD hazard category of 'extreme' because of its location upstream of Queanbeyan and Canberra. The Googong dam spillway (GDS) upgrade project became necessary for two reasons. Firstly, after completion of the original dam and spillway in 1978, a series of relatively small flood events up to 400m3/ sec caused dramatic erosion of the rock in the steep unlined portion of the spillway chute. Progressive remedial measures were undertaken to