TWOFOLD BAY OUTFALL

Click the photograph for a enlarged view

Physical Environment

Landscape

The cliffs in the vicinity of Twofold Bay outfall appear to consist of rocks of the Eden rhyolite group.

Bathymetry & Substrate

Average water depths close to the outfall are 2 to 5 m, shelving quickly to about 10m approximately 20m offshore.

Currents, Winds and Waves

Climate, wind and oceanographic data for the area are available from AWT (1992a) and Patterson, Britton & Partners, CEE & AWT (1998).

Data on oceanography and effluent modelling (MHL466 1986) indicate:

• average current velocities in the vicinity of the outfall was found to be 0.1 m/s.

• directional probabilities of effluent transport - 26% of the time towards Aslings Beach, 37% of the time towards Yallumgo Cove Beach and 37% of the time offshore.

Outfall Site

Twofold Bay

(Twof_5) Last updated May 2000