Qualla: Dawesville Channel

Dawesville Channel: Introduction

Fri, 27 Mar 2026 00:00:00 GMT

Photo credit Orderinchaos, CC BY-SA 3.0. By the mid-1980s, the Peel-Harvey Estuary stank. Not the faint brackish odor of healthy tidal flats, but the unmistakable reek of rotting algae baking in the Western Australian summer sun. Thick mats of blue-green cyanobacteria choked the shallows, fish and crab stocks collapsed, and residents who had once enjoyed boating and swimming on the estuary found themselves living beside what amounted to a vast, warm, nutrient-saturated petri dish. The political arguments were as toxic as the water. For over two decades, farmers blamed industry, industry blamed farmers, and the estuary kept getting worse. The solution, when it finally came, was as blunt as it was effective: carve a 2.5-kilometer channel straight through the coastline and let the Indian Ocean flush the system clean.

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Image: Orderinchaos | CC BY-SA 3.0

Dawesville Channel: A Century of Slow Poisoning

Fri, 27 Mar 2026 00:00:00 GMT

Photo credit User:JarrahTree, CC BY 2.5 au. The Peel-Harvey Estuary system collects runoff from the Murray, Serpentine, and Harvey rivers and their tributaries across a catchment area that receives nearly all its rainfall between May and October, typical of the region's Mediterranean climate. European settlers in the ninet...

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Image: User:JarrahTree | CC BY 2.5 au

Dawesville Channel: Twenty Years of Failed Remedies

Fri, 27 Mar 2026 00:00:00 GMT

Photo credit User:JarrahTree, CC BY 2.5 au. Governments and agricultural groups tried nearly everything. Fertilizer manufacturer CSBP developed a slow-release "sandplain" superphosphate. Alcoa's bauxite mine tailings were spread across farmland to bind phosphorus in the soil. Cleared land was reforested. Work-for-the-Dole ...

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Image: User:JarrahTree | CC BY 2.5 au

Dawesville Channel: Cutting Through the Coast

Fri, 27 Mar 2026 00:00:00 GMT

Photo credit User:JarrahTree, CC BY 2.5 au. After years of deliberation, the Western Australian government committed $54 million to build an artificial channel from the estuary to the Indian Ocean at Dawesville, south of Mandurah. Construction began in 1990 and was completed in April 1994. Workers excavated approximately 4...

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Image: User:JarrahTree | CC BY 2.5 au

Dawesville Channel: The Estuary Reborn

Fri, 27 Mar 2026 00:00:00 GMT

Photo credit Orderinchaos, CC BY-SA 3.0. The results were unambiguous. Since the Dawesville Channel opened, no blue-green algal blooms have occurred in the Peel-Harvey Estuary. Fish and crab populations recovered. Recreational use of the waterway resumed. The Port Bouvard Bridge now carries approximately 40,000 vehicles...

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Image: Orderinchaos | CC BY-SA 3.0