Page 28 - Vertical City
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28 The vertical city
a reasonable cost. The enthusiasm for high-rise connec-
ted 13 dwellings can participate in this evolution.
The L/H rule
The L/H rule defines in urban planning, all others things
being equal, the surfaces and the volumes constructed,
and this includes those destined for dwellings, as well as
all exterior surfaces necessary for the activities of the
city. It has relatively evolved little since ancient times to
our days at the beginning of the 21st century.
It ignores, nonetheless, the impact of scale, as is
demonstrated in the photos comparing an avenue in
New York City with a small street in St. Tropez [figure 7]:
the rule of L/B does not correct this defect.
The net density δn (that which only takes into account
the gross floor surfaces destined for dwellings, calcula-
ted at 25 m²/ inhabitant), the gross floor surface of all
the floors P to the surface of the ground S (P/S ground
use coefficient), as well as the ratio of constructed
surface to the ground C to the surface of the territory
S (C/S: ground occupancy coefficient) are thus calcula-
ted for 12 theoretical implantations of buildings (of 18 or
12 meters in depth depending on whether the facades
are oriented east-west or north-south) [figure 8].
The net density [figure 9], for L/H = 2 and for rows
of parallel dwellings (cases IX and X) rises from zero
13 GOOGLE buys NEST (specialist in intelligent equipment for the
home) January 13, 2014 for 3,2 billion dollars.
