Torbay Inlet is a wave-dominated estuary that functions primarily as a result of wave energy.
Covering a total surface area of 3.1 square kilometres (1 sq mi),[1] 2.1 square kilometres (1 sq mi) of this is the central basin with the remainder being composed of saltmarsh and tidal delta.
A sandbar exists across the mouth of the estuary for most of the year, but it is often breached following significant rain events.
The inlet drains a large swampland area that includes Lake Powell, Lake Manarup, Five Mile Swamp, Seven Mile Swamp and Marbelup Brook along with a number of man-made agricultural drains.
The activities of the group include establishing and repairing fencing around the waterway, Watsonia control and Wetland construction for nutrient stripping.