The Tweed water catchment covers an area of more than 570 square kilometres and is located entirely within the boundary of Tweed Shire. Geographically, it sits within one of the largest natural erosion calderas in the world, which formed following eruptions of the Wollumbin/Mount Warning Volcano more than 20 million years ago. This alignment of geographical and local government boundaries creates a range of unique opportunities for the sustainable management of the water supply catchment, the urban water cycle and natural ecosystems.
The Tweed has an average rainfall of approximately 1600 millimetres a year. Rain that falls within the catchment travels through forests, farms, villages and stormwater drains. As this water moves over the land, it picks up impurities and pathogens, which then need to be removed through the water treatment process.
There are three water supply networks in the Tweed Shire. The major network supplies Tweed Heads and surrounds, the Tweed Coast and the Murwillumbah district. While two small networks supply the rural villages of Tyalgum and Uki.
For much of the year, natural flows in the Tweed River
supply our water.
During drier months (when flows in the freshwater section of the Tweed River fall below 95 per cent), flows are supplemented by releases from Clarrie Hall Dam
situated on Doon Doon Creek - a tributary to the Tweed River. The dam has a capacity of 15,000 usable megalitres and is protected by buffer zones including more than 900 hectares of Council-owned forested land and Mount Jerusalem National Park.
When water is released from Clarrie Hall Dam, it flows down Doon Doon Creek and into the Tweed River upstream of Uki village. It then flows down to Bray Park Weir
(a man-made tidal barrier that stops salt water entering the fresh water supply). Once the water reaches Bray Park Weir, it is extracted, treated and pumped via a network of more than 716km of pipes to 41 reservoirs throughout the shire.
This section provides information on the water supply system in the Tweed. This includes information on the water treatment plants and the vital network of infrastructure that gets water from the plant to your home.
Natural flows in the Tweed River supply our water