Specific factors in site design
include:
Microclimates: The site as related to adjacent structures,
trees, walls and the microclimates within the site created by the building which
had north, south, east and west orientations: temperature, water use and
light availability vary with these orientations and plant types/zones were
selected accordingly.
Soil: Structure (for drainage) and fertility were
enhanced with organic amendments; balancing cut and fill on the site was a
sustainable objective; earth mounds were therefore employed to create a greater
sense of privacy on a small lot.
Drainage: The collection (water
harvesting) and on-site retention/infiltration of rainwater was another 'green'
objective; where possible, downspouts were directed to a cobble swale and an
underground dry well to encourage groundwater recharge; the swale adds an
environmental art component to the site and is crossed by a symbolic 'bridge' to
the front door.
Irrigation: A greywater system was employed for some
of the irrigation; backup conventional spray/drip was also used; the greywater
system required a connection to potable water supply to meet the water demands
of the initial landscape installation until plants are established; greywater
supplies only 25% of the irrigation needs. After two years, plants will be
established and the amount and frequency of irrigation can be reduced.
Plants: A strict native palette was not used; a
broader, Mediterranean/native plant palette provided a greater range of texture,
scent and color in addition to low water use.
The western facade of the house had the greatest potential for solar heat
gain; therefore, jasmine covered trellises were designed to be integral with the
architecture.
An existing deciduous tree (Catalpa) on the south side of the property was
retained to provide shade for house and garden in the summer months and allow
the sun to penetrate the site during winter.
Bamboo, although considered an invasive plant by many, was chosen for its
beauty and also because it symbolizes an important 'green' building material;
root barriers were installed to control the spread of the bamboo.
Turf is completely acceptable in a sustainable landscape if the area is
limited; the small zone of turf at 1001 Emerson was a dwarf fescue which
requires less water and mowing.
Materials: Inert/recycled materials such as glass
cullet and scrap steel were used to create special effects and demonstrate the
potential use for there products.
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