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Multiple land-use through effective usage of subsurface dimension
by Frank van der Hoeven
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A relative lack of space
The western part of the Netherlands, used to be a collection of
mid-sized cities, each with its own history and distinct identity,
dialect and architecture. Travelling through this part of the country
underscored each town as a separate entity, clearly visible in a
flat agricultural landscape, made out of canals, black-and-white
cows, farms and windmills.
Over the past three or four decades these traditionally compact
and dense Dutch cities have transformed into larger agglomerations
and finally into vast urban regions, swallowing smaller towns and
villages in the process.
Living in the nineties now, even these larger parts are about to
fuse together in a sea of look-alike suburbs where `place' as unique
and identifiable space is no longer existent. Daily commuters
in this new so-called Green Heart Metropolis gaze out at a dispersed
urban landscape filled with mushrooming peripheral building sites
staged as the backdrop of growing traffic jams.
It should be no wonder that a feeling is growing among citizens,
policy makers and planners that open space has become a scarce
commodity.
Although it is true that the urban areas have shown dramatic growth
over the past three or four decades, this picture is somewhat distorted.
In contrast to previous times, a growing population is no longer
the main cause for this rapid urban sprawl. Social- economic developments
are much more to `blame', causing the existing population to consume
more space for all its urban functions then ever before.
For example, in 1960 an average Dutch dwelling was the home of 4.0
persons. By 1995 this figure had dropped to 2.5 persons. In the
pre-war areas of the major cities like Amsterdam, Rotterdam and
The Hague the size of the average home is about 60 m2 net floor
area. In more recent residential areas this size has increased to
somewhere between 80 and 120 m2 net floor area (depending on the
category: social or more upscale housing). At the same time the
average housing density of these quarters fell from gross 70 - 80
units per hectare (pre-war) to gross 30 - 40 units per hectare (post-war).
Developments in the field of employment and services are more complex
but are showing a similar trend.
What is called a `lack of space' is merely inflicted by
a transition of open space into the private realm (bigger house,
garden, car park and workplace). Where this expanding private space
collides with necessary collective demands like large scale infrastructure,
it is felt as an intrusion into personal daily life. In this way,
the `lack of space' refers mainly to a remarkable spatial awareness
among Dutch people. By measuring the amount of unbuilt square kilometres
in the Randstad this `lack of space' can not be established or proved.
But at the same time `the lack of space' functions as a self-fulfilling
prophesy. In an attempt to protect to spatial integrity of the original
landscape surrounding the sprawling cities, `Green Belt -like'
areas were defined to contain further growth. The so-called Green
Heart is the largest and best known of these buffer-zones, and has
formed the conceptual basis of the urban planning of the Randstad
since the sixties. Although such a Green Heart strategy may be plausible
and internally consistent, its necessary restrictions on the use
of available land is resulting in an increased competition among
urban projects for the same artificial scarce amount of space around
the core urban areas in the Randstad.
The complexity and duration of urban and infrastructure projects
are increasing, specially where large scale projects are concerned.
Competing parties in this process, able to take matters into their
own hands, vote increasingly with their wheels. By deciding to move
their homes and businesses out of the `congested' areas, the pace
of suburbanisation is accelerating once again.
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