Australia's cities are famous for their parks. But how can they value their "green infrastructure"?

Hyde Park, Sydney. Image: Greg O'Beirne at Wikimedia Commons.

Roger Jones, Celeste Young and John Symons, of Australia's Victoria University, report.

Australian cities score high in liveability awards. Melbourne has topped The Economist’s most liveable cities ranking five years in a row, with Adelaide, Sydney and Perth not far behind and Brisbane in the top 20. Australian cities rank well in other liveability surveys, too, if not so highly. Environment is one of the key factors that these surveys measure, but the data and methods being used are not very sophisticated.

Green infrastructure is a key contributor to these rankings. The networks of green and blue – taking in rivers and streams, parks, green wedges, gardens and tree-lined roads and rail – underpin urban liveability.

Yet, if we look at these valuable assets, they are mainly historical legacies of the 19th century. They include The Domain, Treasury-Fitzroy Gardens and Royal Park in Melbourne; Hyde and Centennial Parks in Sydney; King’s Park in Perth, the Adelaide Parklands and those in Brisbane, Hobart and Canberra.


Their creation was driven mainly by visions of what a city should look like and provide for its people. This was long before the invention of cost-benefit analysis and many of the other tools used to make the economic case for infrastructure.

Future-proofing urban environments

Today, if a key parcel of land is up for development, green infrastructure is often an afterthought, if considered at all. The recent reports that the former Victorian government rezoned Fishermans Bend, a former industrial site of 455 hectares, without proper regard for grey or green infrastructure are not unique.

In an area threatened by sea-level rise, increased flooding and heat island effects, to allow development that exacerbates these issues is extremely short-sighted.

But this is happening in many localities. Changing climate and the unintended consequences of small decisions, such as urban infilling, are making cities hotter, more prone to flash-flooding and less green.

Rain gardens have aesthetic and practical value as they reduce urban flooding by slowing water run-off. Image: Roger Soh/Flickr.

Local government authorities are on the front line with these issues. They carry the major burden of responsibility for developing and maintaining neighbourhood environments. Over the last few years, some councils have considerably increased spending on park renewal, rain gardens to slow runoff, water capture and recycling and urban forest strategies.

However, this is occurring in an economic environment where local government’s resources are limited and efficiency is emphasised at every turn. State governments run on a platform of capping rates, not considering whether those rates reinvested by council generate ongoing socially beneficial returns.

When communities are asked what they want councils to invest in, green infrastructure is usually high on the list. Local government has recognised these pressures, identifying the need to build better business cases for green infrastructure projects and programs in order to justify their expenditure.

Finding better ways to value green assets

A recent collaborative project, involving four metropolitan Melbourne councils and Victoria University, has put together a framework to help local government identify the benefits of green infrastructure over its whole lifecycle.

The aim is to build better business cases to support projects and develop asset management programs for green infrastructure. This would lead to trees and parks being considered in a similar way to roads and buildings as assets that provide a stream of benefits to the community over their lifetimes.

Valuing the benefits of green infrastructure is tricky, though. This is because each element provides multiple benefits, which cover very different types of value.

For example, a wetland can provide flood protection, substitute for external water supply, cool an area, increase biodiversity, provide recreational opportunities and contribute to adjacent property value. These wetland benefits are public, private and intrinsic.

High-quality open space can contribute to people’s physical and mental health and wellbeing. This has the results of offsetting medical costs and promoting higher economic productivity and improved human welfare (happiness and satisfaction). Putting a dollar figure on all of these benefits is extremely complex.

The long-lived aspect of green infrastructure also means it can play a major role in adapting to changing climates within urban environments. The future value of flood protection, cooling services, amenity, recreation and human health and welfare can be substantial.

However, current methods of discounting future dollar benefits, at roughly 5 per cent each year, undervalue these long-term benefits. A recently completed project in Melbourne’s west identified the potential for welfare and environmental benefits exceeding A$300 million over 30 years (discounting at 3.5 per cent) by reducing pollution from an industrial precinct using integrated urban water management principles.

The framework is a starting point for councils to address the economic value of green infrastructure. It is different to most other frameworks, with the emphasis not being on how to select the type of infrastructure, but on how to get a project or program valued, approved and implemented. It has been tailored to existing council processes so it can be used now, but also grow as council programs evolve.

One major gap that our work has pointed out is the lack of available data in Australia to measure green infrastructure benefits with confidence. They are there – but it would be great to rate liveability with confidence, and to have it on the same footing as income or GDP. The Conversation

Roger Jones is a professorial Research Fellow, Celeste Young a collaborative research fellow in the Centre for Strategic Economic Studies, and John Symons a research fellow in the Victorian Institute for Strategic Economic Studies, at Victoria University.

This article was originally published on The Conversation. Read the original article.

 
 
 
 

Coming soon: CityMetric will relaunch as City Monitor, a new publication dedicated to the future of cities

Coming soon!

Later this month, CityMetric will be relaunching with an entirely new look and identity, as well as an expanded editorial mission. We’ll become City Monitor, a name that reflects both a ramping up of our ambitions as well as our membership in a network of like-minded publications coming soon from New Statesman Media Group. We can’t wait to share the new website with you, but in the meantime, here’s what CityMetric readers should know about what to expect from this exciting transition.  

Regular CityMetric readers may have already noticed a few changes around here since the spring. CityMetric’s beloved founding editor, Jonn Elledge, has moved on to some new adventures, and a new team has formed to take the site into the future. It’s led by yours truly – I’m Sommer Mathis, the editor-in-chief of City Monitor. Hello!

My background includes having served as the founding editor of CityLab, editor-in-chief of Atlas Obscura, and editor-in-chief of DCist, a local news publication in the District of Columbia. I’ve been reporting on and writing about cities in one way or another for the past 15 years. To me, there is no more important story in the world right now than how cities are changing and adapting to an increasingly challenging global landscape. The majority of the world’s population lives in cities, and if we’re ever going to be able to tackle the most pressing issues currently facing our planet – the climate emergency, rising inequality, the Covid-19 pandemic ­­­– cities are going to have to lead the way.

That’s why City Monitor is going to be a global publication dedicated to the future of cities everywhere – not just in the UK (nor for that matter just in the US, where I live). Our mission will be to help our readers, many of whom are in leadership positions around the globe, navigate how cities are changing and discover what’s next in the world of urban policy. We’ll do that through original reporting, expert opinion and most crucially, a data-driven approach that emphasises evidence and rigorous analysis. We want to arm local decision-makers and those they work in concert with – whether that’s elected officials, bureaucratic leaders, policy advocates, neighbourhood activists, academics and researchers, entrepreneurs, or plain-old engaged citizens – with real insights and potential answers to tough problems. Subjects we’ll cover include transportation, infrastructure, housing, urban design, public safety, the environment, the economy, and much more.

The City Monitor team is made up of some of the most experienced urban policy journalists in the world. Our managing editor is Adam Sneed, also a CityLab alum where he served as a senior associate editor. Before that he was a technology reporter at Politico. Allison Arieff is City Monitor’s senior editor. She was previously editorial director of the urban planning and policy think tank SPUR, as well as a contributing columnist for The New York Times. Staff writer Jake Blumgart most recently covered development, housing, and politics for WHYY, the local public radio station in Philadelphia. And our data reporter is Alexandra Kanik, whose previous roles include data reporting for Louisville Public Media in Kentucky and PublicSource in Pittsburgh, Pennsylvania.

Our team will continue to grow in the coming weeks, and we’ll also be collaborating closely with our editorial colleagues across New Statesman Media Group. In fact, we’re launching a whole network of new publications this fall, covering topics such as the clean energy transition, foreign direct investment, technology, banks and more. Many of these sectors will frequently overlap with our cities coverage, and a key part of our plan is make the most of the expertise that all of these newsrooms combined will bring to bear on our journalism.

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As for CityMetric, some of its archives have already been moved over to the new website, and the rest will follow not long after. If you’re looking for a favourite piece from CityMetric’s past, for a time you’ll still be able to find it here, but before long the whole archive will move over to City Monitor.

On behalf of the City Monitor team, I’m thrilled to invite you to come along for the ride at our forthcoming digs. You can already follow City Monitor on LinkedIn, and on Twitter, sign up or keep following our existing account, which will switch over to our new name shortly. If you’re interested in learning more about the potential for a commercial partnership with City Monitor, please get in touch with our director of partnerships, Joe Maughan.

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In the meantime, stay tuned, and thank you from all of us for being a loyal CityMetric reader. We couldn’t have done any of this without you.

Sommer Mathis is editor-in-chief of City Monitor.