No parking

Enmore, 2014.

Enmore, 2014.

This is a story about the struggle between the green and the grey, between leaves and asphalt, between street trees and street parking, between what ought to be and what is. In inner city suburbs like Enmore and Stanmore, Marrickville Council is caught in this struggle.

One of the most stressful aspects of urban living is the shortage of parking. Suburbs that sprang up in the Victorian era, when there was no such thing as a motor car, are now undergoing gentrification; households often have more than one car but few houses have off-street parking.

Given the convenience of public transport in area, why do these people need cars? Partly it’s snobbery. Does your solicitor join the plebs on a bus to work? Would your doctor be seen dead in a train? Partly it’s necessity. With both parents working, try juggling work hours, childcare drop-offs and pick-ups, and Saturday sport all over the city. However much people might agree in principle with the environmental benefits of public transport and bicycle riding, often these are just not viable options.

Stanmore, 2014.

Stanmore, 2014.

Shortage of street parking spaces is made worse by visitors to the area. Now that Enmore has become a ‘vibrant entertainment precinct’ hundreds of customers come in the evenings to attend performances or enjoy the many new restaurants, bars and cafes. And they don’t necessarily want to travel across the city in public transport at night to get home. So they infiltrate ever-deeper into residential territory to find parking for their cars. Residents jealously guard driveways (if they have them) and fume when they have to park blocks away from their homes. Marrickville Council knows all this and is trying to address the problem with committee meetings, surveys, community consultation, plans and projects.

Enmore, 2014. Enmore Theatre is in the background.

So why is Council intent on reducing the amount of parking in contested areas, rather than finding extra spaces? It’s because they are also committed to an Urban Forest Strategy that ‘recognizes the urban forest as an essential, living infrastructure asset and resource that provides a wide range of social, environmental and economic benefits’.

And this is what has prompted the demonstration project in Cavendish Street, Enmore, where large Lilli Pilli trees have been planted in structured soil in the roadway. I wrote about this project in my earlier post ‘What lies beneath’. And even though ‘permeable paving’ means that the space taken up by tree-planting ‘blisters’ is smaller than would normally be needed to keep trees healthy, there is no question that parking spaces have been lost. Residents of the street are supposed to have agreed to this arrangement, but they probably would have agreed to any scheme that saw the former huge, inappropriate and destructive fig trees removed from their footpaths.

Enmore, 2014. One tree gained, two parking spaces lost.

Enmore, 2014. One tree gained, two parking spaces lost.

Meanwhile parking pressure on nearby streets has been increased just that bit extra. What’s more, Marrickville’s draft Master Street Plan has Lilli Pilli (Waterhousia floribunda) or similarly large trees slated for some of these same streets. Given the narrowness of the verges, this must mean more in-road planting and more parking lost. Residents of these streets are not going to be too happy about this.

A 2013 survey of residents in the Marrickville Local Government Area found that most people like having greenery in their suburbs. Of course. But what the survey doesn’t mention is that householders also like to park close to their homes and businesses don’t want customers put off by lack of parking. Until a whole lot of things in the world change, this reliance on cars and the need for parking isn’t going to go away. In-road planting is an impractical component of the urban forest strategy and would have measurable social and economic costs. An ideological commitment to such a component would have a detrimental, not a beneficial, effect on the local area. Small trees, please.

Enmore, 2014.

Enmore, 2014.

What lies beneath

New trees have been planted in Cavendish Street, Enmore, but for pavement fanciers the interest lies in the method used to install them. The process was far more complex than simply plonking a tree in a hole. It involved such things as ‘in-road planting’ and ‘structural soil’ and ‘plastic cells’ and ‘permeable paving’ – all designed to address ‘multiple issues, including impact of trees on infrastructure, safety of footpaths, enhancement of the urban tree canopy, landscape amenity and urban water management’.* And preventing the road surface from cracking or caving in.

Marrickville Council seems pretty pleased with the project, which is the first of its kind for this municipality, and maybe for the whole of Sydney. It’s been interesting watching the process, but I have some misgivings.

Cavendish Street, Enmore NSW, June 2014

It all started more than three years ago, when Marrickville Council began removing very large fig trees from the footpaths on the street. Although enjoyed by birds and bats, these trees broke up the paving and invaded underground pipes. I wrote a blog post about local mourning when the first tree was removed.

Cavendish Street, Enmore NSW, October 2010

‘Tree replaced by cement!’, Cavendish Street, Enmore NSW, October 2010

The story resumes in April this year, and here’s how it goes. The Council excavates three huge rectangular pits in the street, digging deep down into the clay beneath the surface of the road.

Cavendish Street, May 2014

Cavendish Street, May 2014

Underground infrastructure, including gas pipes, is adjusted and gravel is spread in the bottom of each hole.

Cavendish Street, May 2014

Cavendish Street, May 2014

Next, a layer of large plastic cells is positioned in the pit and ‘structural soil’ is tipped in between them. Another layer of cells and soil is added, this time with a rectangular hole in the centre fenced off with plywood formwork. As I understand it, the plastic cells act as support for the roadway above; the structural soil is a mix of gravel and loam that resists being compacted and allows tree roots to spread and grow.

Cavendish Street, May 2014

Cavendish Street, May 2014

Over the soil comes a layer of geotextile then another layer of gravel.

Cavendish Street, May 2014

Cavendish Street, May 2014

Concreters build retaining edges around the central tree hole to form a ‘blister’. This will prevent cars bumping into the tree trunk.

Cavendish Street, June 2014

Cavendish Street, June 2014

Permeable pavers are laid. Rain falling on the road will flow towards this area of porous paving. This means that street run-off will infiltrate the tree pits instead of gushing down the gutters and into stormwater drains.

Within a day or so, on a nice rainy morning, advanced trees are lifted into the central hole, the formwork is removed and more soil is tipped around the large root ball. The three trees are Waterhousia floribunda ‘Green Avenue’, a cultivar of the rainforest Weeping Lilli Pilli that is expected to grow to 16 metres.

Cavendish Street, June 2014. All photographs by meganix.

Cavendish Street, June 2014. All photographs by meganix.

 

The project is not quite finished. A garden will be planted inside each blister. But the safety fencing has been replaced by witches’ hats and the official photographer has been sent to take photos for Council publications. As the unofficial photographer and busybody I’m rushing into e-print with this blog post.

In my next post I will talk about how my admiration for this aboricultural and civil engineering feat is tempered by reservations about the push and pull of local council policies.

 

*Marrickville Matters, December 2013, p.9.