Smart ways with water will purify the catchment


Part of the catchment, the brown Belongil Creek running to the sea. Image Google Earth

Mary Gardner

Cavvanbah was name the Bundjalung people used for what is now Byron Bay. The word is translated as ‘the meeting place’ in the sense of different peoples coming together. But the name could well describe a location where fresh and salt waters meet. Not quite land, not entirely sea. Coastal dunes and swamps. This is one of Australia’s major hotspots for plants, animals and ourselves. But it also presents us with catastrophic cyclones, erosion, droughts and floods. How are we to live here?

The Byron-Belongil catchment is small, only 30km². But it’s an ecotone, a scientific term for transition zone. ‘Eco’ is from Greek oikos meaning ‘home’ or ‘family’ and tonos meaning ‘tension’. The shifting sands, the growing peats, the ever-changing mixes and levels of fresh and salt water supporting many lives.

Bundjalung fisher-farmers managed themselves within this production zone of freshwater and marine animals, birds and reptiles as well as yams and other cultivations. Their complex self-government included enhancing conditions for important animals and plants. Historic records offer tantalising fragments about their coastal systems thinking.

There are also historic records of the fisher-farmers of Hawai’i. Ahupua’a is their word for catchment, which extends from the ridgelines to the outer edges of lagoons and reefs. Groups of people belonged within particular ahupua’a, and managed themselves to the unique qualities of place. Their knowledge grew, building from mistakes, aiming to enhance conditions.

From the 1800s, the rule of these first inhabitants was disrupted, the wildlife fragmented and wetlands drained. Here, British power dominated. To make a new way of living in this place, a new series of trial and error. But the genuine wealth of this ecotone has degraded. Now, residents here rely heavily on imports from other catchments. The natural hazards? Worse.

See, the Belongil always moderated between fresh and marine water. It sheltered the koalas’ trees and grew the waterbirds’ foodstuffs. It raised the prawns, crabs and fish, which fed larger marine animals.

The Belongil also sluiced away the wastes of early industrial and residential Byron. Much as the farmers did, the townspeople cut drains through their swamp, channelling them into the waterway. This was 1950s urban engineering, whose motto was ‘move water away fast’. They placed houses within this network of drains, renamed as reserves. These are still found in Sunrise, Pacific Vista, Lilli-Pilli and beyond.

The townspeople drained the CBD and the oldest residential zones via the Butler Street drain. They also emptied a pond, which became first the town tip and now the Byron markets. Finally, they drained the deep swamp ponds at the Sandhills and channelled more stormwater to drain on the sand at Main Beach, Clarkes and Cooks.

Unfortunately, this infrastructure exacerbates drought and flooding. Stormwater is never conserved and cleaned, but rushes along town drains too small to cope into a Belongil already force-fed by rural drains.

This system relies on a mechanically dredged opening to the sea. The same allows for storm surges backing up to the town. No water reserves for drought. No flood protection during storms.

The latest water infrastructure, in 2005, was the sewage treatment plant. This award winner was at the forefront of the new town movement called Water Sensitive Urban Design (WSUD). To avoid an effluent outfall at sea, the idea was to redistribute it through a clever network of regenerated wetlands, filtration systems and storage ponds through town and farm. This would conserve and purify water, ease floods and revive wildlife.

This integrated Byron-Belongil catchment thinking is old and new. But it’s yet to be completed. It risks being destabilised altogether by the rezoning at West Byron. By old-school drain management. By plans to upgrade town using more 1950s engineering.

But this thinking is a key to how we can live here. Count it off the fingers of your hand. We can regenerate wetlands along farm drains and remodel town infrastructure so that rainwater Waits in ponds and reserves, which also Accept and store stormwater. This will Turn lifecycles of water plants and microbes and Engage coastal wildlife. Purified waters now carry organic carbon to marine food webs, ultimately Renewing the sea.

Altogether this spells WATER. It’s another layer of meaning for Cavvanbah: a meeting of insight and action.

3 responses to “Smart ways with water will purify the catchment”

  1. Ross Thatcher says:

    Excellent ideas. I’ve long been concerned with the eroding coastline which used to be many dunes away from the Belongil swamplands, but is now barely one dune away. What happens when that last dune goe? I think all drains should be manufactured in a tiered wall system easily grown from hemp made into hemp-crete with the addition of lime, made with long foundation molds and eventually built into large long pyramid-shaped flood-walls that collect the water during abundant rainfall and allow for safe and easy access to people and animals alike. Hemp-crete eventually sets like stone the older it gets. Not only is it the building product of the future, it’s quite possibly the best explanation for how magnificent stone structures may have been built thousands of years ago which still stand to this day, boggling the mind of many. The rounded edges of ancient stonework may just be where the canvas molds bulged between formwork boards. Such waterways could allow for the gradual building up of the ground level while reducing or eliminating erosion caused by virtually all current agricultural methods, apart from permaculture.

  2. Ms Liz Gibbs says:

    Thank you – I so enjoy reading common sense. Sincerely hope Council takes this perspective on board. I’m inspired … and wouldn’t it look pretty (the remnant chain of wetlands that run through Perth provide the most beautiful & tranquil spaces within the urban environment – the jewels in that fair city).

  3. Jan VOS says:

    Brilliant Research MARY
    Just Brilliant..
    Jan VOS ex Sunrise 41 Julian Rocks after 25 years
    My sensors / sense had had enough!!
    Take care..

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