Built-out Barcelona makes space for an urban forest.

When a city needs green space, but it’s all out of room, what can it do?

It’s an issue that many older, denser cities are facing as they try to make themselves more amenable to their citizens and the environment. For Barcelona, this challenge requires especial ingenuity. Take a walk around what is one of Europe’s most densely populated city cores and you’d be forgiven for pronouncing the place full.

With an intense knot of historic masonry at its heart, Spain’s second city doesn’t display the most obvious potential as a future green paradise. But it badly needs new green spaces to battle its heat island effect, manage air and noise pollution, and generally improve citizens’ quality of life.

That’s why, on Monday, the city nonetheless rolled out a paradigm-shifting re-greening program, one that will double the number of trees in the city, increase park space by two thirds, and give each citizen an extra square meter of green areas. The urban plan, which will deliver 108 acres of new green space by 2019 and over 400 acres by 2030 is a model of ingenuity that could serve as a model for other cities.

Barcelona’s problem is not that it currently lacks parks. Its Parc de Collserola, which extends out from its western suburbs, covers a vast 80 square kilometres. The problem is that its green space is very unevenly distributed. Almost all of Barcelona’s larger parks are on the slopes rising up to the modest mountain range that backs the city. This works well as a weekend getaway and general backdrop, but they’re far from the city’s centers of activity.

In its core, Barcelona is built up more or less to the last square inch, with a network of historic streets and alleys supporting a population density greater than Manhattan’s. This area’s sea of buildings is sometimes softened with avenues of trees, small gardens, and one modest but beautiful park—but it can still feel heavy-aired and claustrophobic on Barcelona’s many hot days.

View from the Parc dels Tres Turons, located in the hills behind Barcelona’s city center. (Ajuntament de Barcelona)

This imbalance may partly contribute to major differences in temperature between the city’s center and its periphery. Temperatures are typically up to 7 degrees Celsius (11 degrees Fahrenheit) higher in the old town than in the city’s greener, higher suburbs. Cities on the Iberian peninsula have always adapted carefully to intense summer heat. Streets stay narrow to provide shade, while south-facing windows often stay covered with awnings and shutters in the hotter months to keep interiors cool without automatic resort to air conditioningair conditioning/cooling is the process of altering the properties of air (primarily temperature and humidity) to more comfortable conditions, typically with the aim of distributing the conditioned air to an occupied space to improve thermal comfort and indoor air quality.. Still, in a city where summer highs already regularly reach above 90 degrees Fahrenheit, climate changeClimate change is a lasting change in weather patterns over long periods of time. It can be a natural phenomena and and has occurred on Earth even before people inhabited it. Quite different is a current situation that is also referred to as climate change, anthropogenic climate change, or ... will see Barcelona only get warmer, drier and potentially more uncomfortable. Plans to green the city are thus not merely about creating a more pleasant-looking urban environment—they’re an essential step toward ensuring that inner Barcelona stays liveable in summer.

No major park can be carved out of an environment this densely built, but the city nonetheless plans to transform its core into a blooming mosaic of plants and leaf cover. The city has found space for five new gardens, which will ultimately be linked up to existing open spaces with lush new corridors of greenery that will create a seamless habitat for urban fauna. Green roofs will soften the sun’s glare, creepers will extend across bare walls, and temporary gardens will squat on sites waiting for construction, cooling and freshening their surroundings.

Barcelona’s green corridor network as it will appear when complete. The dark green land in the top left is the Parc de Collserola, which stretches from the city far out into the surrounding region. (Ajuntament de Barcelona)   

The five new gardens, many of which are already under construction, are a lesson in finding space where there doesn’t appear to be any. The largest one will spring up around a major city square; the land used to belong to roadA road is a thoroughfare, route, or way on land between two places, which has been paved or otherwise improved to allow travel by some conveyance, including a horse, cart, or motor vehicle. Roads consist of one, or sometimes two, roadways (British English: carriageways) each with one or more ... traffic, but those cars are now being diverted into nearby tunnels. A small park was already created at Plaça de les Glòries Catalanes, and by burying elevated roadsA road is a thoroughfare, route, or way on land between two places, which has been paved or otherwise improved to allow travel by some conveyance, including a horse, cart, or motor vehicle. Roads consist of one, or sometimes two, roadways (British English: carriageways) each with one or more ... that currently criss-cross the space, the city has found a way to greatly extend it and make the resulting oasis much calmer.

Another green space will be made—controversially—by clearing away a large courtyard block in the city center that is currently partially filled by squatted, single-story 1920s workshops. A third public space will be created by opening the lush, mature 7.5-acre garden of a newly created house museum to the public. A fourth park will be opened on what is currently a small, scrappy piece of ex-industrial semi wasteland in the hinterlands behind the city’s main container port, and a fifth will be created as part of a long-stalled but newly revived redevelopment of an outlying barracks.

An already constructed interior courtyard garden in the Example District. (Ajuntament de Barcelona)

Arguably the biggest change isn’t from the parks, but from the policies designed to connect green spaces into one leafy network. Ten large interior courtyards in Barcelona’s Eixample district will be planted with trees, while 10 city squares will get parking restrictions that allow for more plantable area. New or enlarged avenues of trees will thread this network together along major streets with surfaces that are more permeable to rainRain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then precipitated—that is, become heavy enough to fall under gravity. Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Earth. It ..., so that birds and insects can spread across a seamless habitat.

If Barcelona seems especially keen on these corridors, it’s partly because they have already been tried and proved a success. In 2000, the city opened a long, slender park along the banks of the river Besós, a formerly filthy stream passing through industrial lands in the city’s northeast. Since being cleaned up and partly reopened to the public (some areas are protected wetlands), the river banks (viewable here) have thrived with plants suited to brackish waterClimate change is expected to exacerbate current stresses on water resources from population growth and economic and land-use change, including urbanisation. On a regional scale, mountain snow pack, glaciers and small ice caps play a crucial role in freshwater availability. Widespread mass ... while the river itself is now alive once more with eels, frogs, and terrapins.

How the green corridors could look at ground level.Ajuntament de Barcelona

Back in town, the city is also stumping up a lot of cash to promote green roofs. The city has just called for applications for 50 bursaries of €1,500 to create greening plans for roofs across the city. The top 10 of these submissions will be eligible for grants of up to €100,000 per roof, while elsewhere the city will get new bird and bat boxes, rooftop hives, and insect hotels. Creeper will also be planted and trained across bare walls.

Taken individually, all these microprojects are tiny drops in the bucket. Together they will work to form a floodThe overflowing of the normal confines of a stream or other body of water, or the accumulation of water over areas that are not normally submerged. Floods include river (fluvial) floods, flash floods, urban floods, pluvial floods, sewer floods, coastal floods, and glacial lake outburst floods ..., creating a future Barcelona that is greener, fresher, more sustainable, and more humane.

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