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Water Efficient Design of Sustainable Green Open Spaces: A Knowledge Based Computer-Aided Design Tool
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Water Efficient Design of
Sustainable Green Open Spaces
TECHNION
Israel - Institute of Technology
Daphna Drori M.Sc. Candidate
Prof. Edna Shaviv
WREF 2012
A Knowledge Based
Computer-Aided
Design Tool
The KBCAD tool for Water Efficient Gardens
(WEG) and the advantages of the tool
Implementations of the WEG tool in the Israeli
“Sustainable Building” standard (SI 5281) 3
1
2
Plan of the Talk
The water crisis and the need for a water
efficient design
What makes the neighbor grass “yellower”?
The question: How to do that?
The solution:
Water efficient landscape design
Via
integration of bioclimatic design in the garden
The problem:
In respond to the water crisis, governmental
policy of raising the water cost was taken and
caused the drying out of the gardens and the
creation of "yellow" neglected open spaces
The yellow grass of the neighbor's garden
The green grass of the case study garden
The Water Efficient Garden(WEG) Tool
A need for a KBCAD expert system for Water Efficient Gardens
Findings:
Governmental, professional
and scientific information for
water efficient gardens exists
Information is not always
accessible for users
Information doesn’t direct
the planner qualitatively or
quantitatively, from the early
design stages
A computerized format is
easy to retrieve
Water efficient
landscape
design
Water Authority
Water efficient garden
A field study
Ben Gurion University
of the Negev Water efficient plants
Ministry of Agriculture
Ministry of Agriculture
Species Factor of
the plants
The Water Efficient Garden (WEG) Tool
Christopher Alexander
Water efficient gardens
Non potable water
Landscape Design
Runoff Agro- technical
methods Irrigation
Specific adjustment to every project
Presenting the existing information in a
computerized format available for users
based on the “Pattern Language”
A semi-lattice decision-making design process
Level 1 5 major
branches
The WEG Tool interface
Links to other patterns in the tool and outside
An example of a pattern page
Semi-lattice links to the
same major branch
Semi-lattice links to other
branches
Hierarchical links for
orientation
Vertical links to “orientation
maps”
External links to governmental
sites and case studies
The tool directs the planner both
qualitatively and quantitatively,
from the early design stages,
how to achieve water efficient
gardens.
Quantitative Tool
The Integrative WEG Tool
Qualitative guidelines and a quantitative evaluation
Water Efficient Design
Modify
WEG Tool
Qualitative Tool
Integration with the Quantitative Tool
A quantitative information (in red) or a transition to the
quantitative tool for a numerical evaluation
A short definition or a transition to the qualitative tool for a
comprehensive explanation
Integration with the Qualitative Tool
Fully or partially shaded vegetation by
the surround built elements
Field implementation
63 48%
47 43%
34 42%
32 42%
69 52% 62
57% 48 58%
47 58%
0
20
40
60
80
100
120
140
2007200820092010
Gallo
ns p
er
year
Annual water consumption
Indoor consumption (Gallons)
Irrigation consumption (Gallons)
The Garden Case-Study
Validation procedure
Remark: The results are similar but not exactly identical because
the calculator is based on statistical data, while the actual results
are based on the very specific conditions for the years 2007-2010
Research end Development Implementation
A Performance – based
approach was developed
A prescriptive - descriptive
approach was developed
Reference gardens were
defined for each climate
zone
The prescription - descriptive approach
Table c-3 the northern zone of Israel (from Appendix c – SI 5281)
There is a need for reduction in water
consumption in the built environment
The WEG Tool is both effective and
user friendly
The WEG Tool includes qualitative as
well as quantitative tool
The WEG Tool is applicable for design
processes and R&D procedures
The reference gardens for the
performance and the prescriptive
approaches for the Israeli
“sustainable building” standard were
defined by the WEG Tool
Summary and conclusions
Recommended