Our catchment and Deep Creek Dam
A catchment is an area bounded by natural features such as hills or mountains where all run-off water from rainfall flows to a low point.
Eurobodalla has three major catchments: Clyde, Tuross and Moruya. There are also many small coastal catchments that contain coastal lakes that open to the sea sometimes, plus small coastal inlets.
Water from the three main rivers: the Deua, Tuross and Buckenboura Rivers make up Eurobodalla’s town water supply. All three rivers rise from the eastern slopes of the Great Dividing Range.
The Deua River rises within Deua National Park in thickly forested ranges south of Braidwood. It flows generally south, west, north, northeast, south southeast and east, making almost a complete circuit, and is joined by 14 minor tributaries before becoming the Moruya River near Kiora. With an approximate catchment area of 1,553 square kilometres*, the river descends 634 metres over its 139-kilometres course. The lower reaches of the river are called the Moruya River, while the freshwater reaches are called the Deua River.
The Tuross River rises on the western edge of Wadbilliga National Park, not far from Cooma. It flows generally north, east and northeast, joined by 14 tributaries including the Back and Wadbilliga rivers, before spilling into Tuross Lake. With an approximate catchment area of 2,175 square kilometres** the river descends 1,170m over its 147km course.
The Buckenboura River rises within Monga National Park and flows through a series of heavily wooded gorges. It is joined by two minor tributaries before joining the Clyde River around 5km from Batemans Bay. With an approximate catchment area of 252 square kilometres, the river descends 598m over its 42km course.
Water from the Deua and Buckenboura rivers is pumped into our off-river reservoir Deep Creek Dam.
*information from Water Resource of Moruya Valley Report No.181970
**information from NSW Department of Primary Industries Office of Water Report Card for the Buckenboura River Water Source
Deep Creek Dam
Completed in 1983, Deep Creek Dam is near Mogo, just south of Batemans Bay.
It is open for public viewing, and there are Mountain bikes and walking tracks around Deep Creek Dam.
You can get to it by driving into the Eurobodalla Botanic Gardens turnoff and continuing past the gardens to the dam viewing area.
Deep Creek Dam has a catchment area of 320 hectares and a capacity of 4900 million litres, which provides an ample water supply to the Northern part of the shire. It has a surface area of 54ha, a maximum water depth of 27m and an average depth of 8.2m. The water in this ‘off-river’ storage facility is pumped from the Deua and Buckenboura Rivers.
Deep Creek Dam supplies water to the Northern Water Treatment Plant.
The spillway only operates when the dam is near full and heavy rains occur.
Deep Creek Dam is considered a sufficient water supply for the shire, however construction of a second dam is being considered in the southern part of the shire to ensure we have plenty of water well into the future.
Improving water quality
In 2009/2010 five SolarBee™ aerators were installed in the dam to reduce algal bloom, improve overall water quality and reduce aeration costs. Replacing the aerators previously used in the dam with five SolarBees also resulted in a 68% savings in Council’s annual electricity cost.