Lyla Lindsey
Western Australia is home to several dams, including the South Dandalup Dam, the Harding Dam, and the Wellington Dam. These dams serve various purposes, such as supplying drinking water to cities, providing recreational areas for locals, and offering scenic views for tourists. The water levels in these dams can be affected by factors such as rainfall and climate conditions, which are monitored by organizations like Elders Weather and the Western Australian Government. As of 2025, Tripadvisor lists some of the dams in Western Australia among the best in the region.
| Characteristics | Values |
|---|---|
| Number of dams in Western Australia | 10 |
| Names of the dams | South Dandalup Dam, Harding Dam, Wellington Dam |
| Uses | Supplying drinking water, recreation, camping, sightseeing |
| Dam height | 43 meters (141 feet) |
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What You'll Learn
The impact of declining rainfall
Western Australia has experienced significant changes in its climate over the last century, particularly in the last 50 years. The average temperature has risen by about 1°C, and rainfall patterns have shifted, with increases in the north and interior, but notable declines along the west coast and in the southwest of the state. This region has seen a 10 to 20% drop in winter rainfall since the 1970s, with an absence of the high-rainfall years that were once common.
The impact of this declining rainfall has been far-reaching. One of the key consequences is the Millennium Drought, which affected much of southern Australia, including Perth and other major cities, from 1997 to 2009. This prolonged dry period had cumulative effects, leading to long-term drying of vegetation and landscapes, and placing significant strain on water resources. The drying trend in the southwest has resulted in a westward shift in rainfall zones, impacting agriculture. The northeast grain belt, for instance, now faces the risk of rainfall that is too low to support profitable farming.
Agricultural water use accounts for a substantial portion of Western Australia's water consumption. With declining rainfall, groundwater, large dams, and on-farm water sources have become increasingly vital for irrigation, pasture, and fodder production. However, the reliance on these alternative water sources may not be a sustainable long-term solution, as evidenced by declining dam levels and water storage levels across the state.
The reduction in rainfall is attributed to a combination of factors, including a southward shift of the subtropical ridge and the strengthening of the southern hemisphere polar jet stream. These changes have resulted in a weaker subtropical jet stream, leading to reduced storm development over the southwest of the state. Additionally, anthropogenic warming and stratospheric ozone depletion have likely contributed to the contraction of mid-latitude storm tracks towards higher southern latitudes.
The impacts of declining rainfall extend beyond agriculture. Drought conditions can increase fire risk, as seen with the increase in fire risk across Western Australia. Additionally, low soil moisture levels can hinder crop growth and impact pasture availability for livestock, affecting the state's agricultural and pastoral industries. The drawdown on water resources during prolonged dry periods can also have ecological consequences, threatening the health of natural ecosystems and water-dependent wildlife.
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The South Dandalup Dam
South Dandalup Dam is one of the largest dams supplying Perth, Western Australia, with drinking water. It is located 90 km (56 miles) southeast of Perth and 6 km (4 miles) from Dwellingup, a historic timber town in the middle of an old-growth jarrah forest. The dam is managed by the Water Corporation and is open to visitors every day until 5 pm or 6 pm.
The dam was built in the early 1970s to address water scarcity in Perth during a period of major growth in Western Australia. Completed in 1971, the earth-filled dam has stood the test of time and now serves as a popular recreation area for the people of Perth. It offers picnic tables, gas BBQs, and walking trails. The dam is also known for its impressive views, tall trees, and rich bird life, including robins, finches, and blue wrens.
South Dandalup Dam is an earth-fill embankment dam that stands at 43 meters (140-141 feet) tall. It is surrounded by undisturbed virgin bush, with an abundance of wildlife, including kangaroos and native bird species. The area is a popular destination for nature lovers and those seeking a day trip from Perth, with the journey averaging around 100 minutes.
To get to the South Dandalup Dam from Perth, one can take the Kwinana Freeway, Tonkin Highway, or Albany Highway to Armadale and then follow the South Western Highway to the North Dandalup township. The dam is easily accessible and well-maintained, making it a favourite stopover for many, especially those who enjoy biking or being close to nature.
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The Harding Dam
With a maximum capacity of 64 gigalitres, the Harding Dam plays a crucial role in ensuring a stable water supply for the region. The dam's capacity has fluctuated over the years, with varying rainfall impacting the water levels. For example, in 2011, the dam experienced low water levels of only 20% capacity, but by February of the same year, substantial rainfall from Cyclone Carlos brought it to maximum capacity, providing enough water for two years for the surrounding towns.
However, it is important to note that due to the dam's function as a source of drinking water, certain activities are not permitted. Water-based activities are prohibited, and visitors are asked to avoid the 2-kilometre reservoir protection zone to maintain water quality. The 1,100-square-kilometre source protection area surrounding the dam allows only for bushwalking, providing an opportunity to immerse oneself in nature while respecting the integrity of the water source.
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The Wellington Dam
The dam is now one of the most iconic sections of the Collie River due to the addition of a giant mural on its face. The 8,000-square-metre mural, titled 'Reflections', is the world's largest dam mural. It was painted by artist Guido Van Helten and took four months to complete. The mural features images of Collie mines workers, families playing in the water, Aboriginal children, and other scenes inspired by historical photographs of Collie.
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Water sources and usage
Desalinated seawater has been supplying Perth with drinking water since 2006. This source of water is independent of rainfall, providing a stable supply during periods of low rainfall runoff into dams. Groundwater also plays a crucial role in sustaining the water supply in Western Australia, with investments being made to protect lakes and wetlands and reduce groundwater withdrawal from environmentally sensitive areas.
Water recycling is another important aspect of water management in the state. Western Australia currently recycles around 20% of its wastewater after treatment, with a commitment to increase this to 35% by 2035. This initiative is part of the state's efforts to become more climate-resilient and protect its unique lifestyle.
Agriculture, forestry, and fishing industries are significant water users in Australia, with water consumption in these sectors increasing by 3% nationally in the 2021-22 financial year due to high water availability in New South Wales and Queensland. While seawater used for desalination decreased by 5% in the same period, groundwater use fell by 9%, indicating a shift in water sources.
Overall, Western Australia is actively addressing the challenges posed by declining rainfall and climate change by diversifying its water sources and promoting sustainable water usage. By investing in desalination, groundwater networks, and water recycling, the state aims to secure reliable water supplies for its communities and adapt to the changing climate.
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Frequently asked questions
I could not find the current levels of the dams in Western Australia. However, I did find that dam levels are affected by declining rainfall.
The South Dandalup Dam was built in the early 1970s to supply drinking water to the city of Perth.
The South Dandalup Dam is 6 km from the historic forest town of Dwellingup.
The Harding Dam is a popular dam in Western Australia, although it has been overrun by a biosecurity threat in the form of feral populations of Australian red-claw crayfish.
Yes, the Wellington Dam is notable for its beautiful mural.
