View

September 2017 | Report

 

Transforming the city both green and blue is how Singapore can achieve a highdensity and liveable environment, said Centre for Liveable Cities Executive Director Khoo Teng Chye to policy makers, planners, developers, architects and landscape architects gathered for the recent “Dense and Green Building Typologies: Architecture as Urban Ecosystem Symposium”. They were brought together by Future Cities Laboratory (a programme of the Singapore-ETH Centre) and hosted by the Urban Redevelopment Authority to discuss how dense and green building typologies can contribute to developing compact, yet, highly liveable future cities.

 

---

 

When we plot the liveability of cities on a chart, positioning “Liveability” against “Population Density”, most of the indexes rank cities like Vancouver City, Sydney and Melbourne, among the most liveable cities. These tend to be huge cities with low density. However, there are a few high-density cities that liveable—Singapore is one of them.

 

As this symposium, I will focus on how Singapore has improved our liveability despite becoming denser through our urban systems approach of making the city green and blue. I will discuss how we made Singapore, first into a Garden City, then a City in a Garden, a City of Gardens and Water, and beyond this, a City in Nature.

 

When we think about high density, we tend to imagine concrete jungles. In the case of Singapore, our approach to greenery is not about planting lots of trees, but how greening is in tandem with urban planning and development. We describe this as the system approach of adopting a holistic and comprehensive vision, which translates into actionable plans and policies.

 

The greenery urban systems approach has three main thrusts. First, we have a hierarchy of greenery within the urban matrix. Instead of creating parks anywhere and everywhere, we built national parks such as the Botanic Gardens and Gardens by the Bay. Regionally, we have parks such as the West Coast Park, East Coast Park and Bishan-Ang Mo Kio Park. Further down, we have town parks, and within each town we created neighbourhood parks and community parks.

 

Second, we wanted to make greenery prolific and to transform Singapore into a canopy of green. We looked into the type of trees for planting and implemented standards to make sure greenery is pervasive within the urban fabric of Singapore. This was achieved by overlaying greenery on the city’s various networks, such as the roads in the form of road side trees and covering concrete structures like retaining walls, parking lots, and drainage reserve (now Park Connectors) with greenery.

 

Third, we implemented rules, incentives and land zoning policies that require for green buffers to be created, and for rooftop and skyrise greenery to be incorporated within the buildings. As a result, you can see from the satellite image by NParks that our green cover grew from 35.7% in 1986 to almost 50% in 2010 even as we continue to urbanise. Over time, this has become our Greening Story.

 

Turning the City Blue
Now, I want to talk about water and the Active, Beautiful, Clean Waters Programme (ABC Waters). Water is an existential issue in Singapore. While we receive an abundant rainfall of 2400mm a year, we do not have enough ground water. We have since diversified our water sources; investing in technology to create alternative supplies in the form of NEWater and desalinated water. One of the most important tasks for PUB, the National Water Agency, is to systemically harvest as much rainwater as possible, and close the water loop to produce NEWater. Originally, we had three reservoirs, but now we have created 17 reservoirs and turned almost two-third of the island into a water catchment.

 

The idea of ABC Waters is to get people to treasure water as a resource by bringing them closer to water. Beyond that, water can also be managed as an environmental and urban asset that enhances the city. The Blue Map shows that Singapore has 8,000km of rivers, drains and canals. Many of them are ugly water pipes and hard-looking concrete monsoon drains which can be transformed into vibrant and beautifully naturalised streams, rivers and lakes.

 

The genesis of ABC Waters began with the Urban Redevelopment Authority (URA) when the agency started the Waterbodies Design Panel in the late eighties to pilot some of these ideas. You will notice that Sungei Api-Api looks like a river of mangroves, however, it is actually a monsoon drain with planted mangroves to soften the banks of the river. The Bukit Panjang Stormwater Pond is also one of the first projects that was naturally landscaped. Unfortunately, these projects were phased out due to the lack of a systemic approach to sustain and institutionalise the programme.

 

When I joined PUB in 2003, we began implementing ABC Waters by developing Singapore into three catchments and drew up a masterplan to identify opportunities to naturalise the waterbodies. We identified about 100 projects and systemically sought budget approvals to build the sites over a 5-year period. One of the most important justifications we used for these sites is how the programme enhances property value. This is especially true in the case of Bishan-Ang Mo Kio Park. After the park was announced, property prices of the surroundings went up immediately.

 

Another example of our blueing process was the planning and construction of Punggol Waterway by PUB and the Housing and Development Board (HDB). We cleaned up Lorong Halus, an old solid waste landfill, and dammed the Punggol and Serangoon reservoirs. Instead of building an underground pipe to connect the two reservoirs, we created an open waterway, and in the process, many new waterfront neighbourhoods. These are the many opportunities that water presents. In the west, JTC created an eco-industrial park at the fringe of Nanyang Technological University. Instead of building a conventional drainage system, we created the Jurong Eco-Garden, which is now a constructed freshwater wetland that seamlessly intersperses with building parcels. There are also other examples such as the vegetated bioswales and bioretention basin in Windsor Park Estate and Waterway Ridges.

 

Mainstreaming ABC Waters
We need to move beyond just beautifying water bodies, but to see water as a much broader opportunity to enhance the urban environment. This means mainstreaming ABC Waters, and looking at how to integrate water upstream in the urban planning process. This is being pursued by URA, PUB and other agencies following a workshop organised by CLC in 2015. Beyond looking at waterbodies, we should look at water as it falls on the land and buildings, and plan for how we can make water pervasive in the same way we are doing for greenery.

 

Bishan-Ang Mo Kio Park is an example of this. Instead of just beautifying the canal, agencies worked together to naturalise and integrate the canal into the park. The concrete rubbles of the monsoon canals were recycled. In this process, we also resolved the capacity of drainage through bioengineering techniques and created a bigger park.

 

Singapore, more than any other city, has the opportunity to make our city as blue as it is green. We can learn lessons from greening, and apply them to mainstream ABC Waters. We have documented the lessons, ideas and projects of the ABC Waters in our Urban Systems Studies publications, which are all available on our website.

 

Towards a City in Nature
Combining the green and blue in our city has brought about an increase in biodiversity where trees and flowers attract animals such as otters, hornbills and many more. The National Parks Board (NParks) has a truly ambitious vision where they see Singapore as a natural ecosystem. The four zones of high “Biodiversity Core Areas” are left relatively untouched, namely the Central Core which consists of the Central Catchment and Bukit Timah Nature Reserve, the Western Core includes the Sungei Buloh Wetland Reserve, the Northern Core is made up of Pulau Ubin and Coney Island, and the Southern Core includes the entire stretch of the Southern Ridges. At each of these areas, NParks created “Nature Ways”, which are green buffers that improve the ecological connectivity of these areas. At the microscale, there are tremendous opportunities for architects and engineers to turn every single project to be part of this urban ecosystem.

 

Beyond parks and waterbodies, our Concept Plan review should also have a City in Nature plan. Our current Water-Sensitive Urban Design (which is an Australian expression that we call ABC Waters design features here) should shift towards Nature-Sensitive Urban Design. This is an evolving approach that we should try to encourage. We should push for such urban designs to be incorporated in the land sales considerations. We can also look into developing buildings and infrastructure based on the principles of building with nature.

 

This is an exciting area where there are tremendous opportunities and challenges for research. There will be questions of why we need a City in Nature, whether it is for health, resilience or aesthetic reasons, hence we need a better understanding in many of these areas. There are also many new developments that offer opportunities to undertake pilot projects, such as HDB’s upcoming Tengah “Forest Town”, Singapore’s second Central Business District (CBD) in Jurong Lake District, and reclaimed land on Pulau Tekong.

 

I am optimistic that we can become the first City in Nature. More than any other city, Singapore has the propensity to make this happen. This should not be just a wish but we have to make sure it happens.

 

---

About the Speaker