Where W is the weight of the indicator (i), S
is the score of the indicator (i), and n is the total
number of indicators (i’s) in a specific cluster (C,
E, I and P). The next step required the panels to
define the sub-indicators for each indicator. In the
form we listed several indicators and relevant sub-
indicators for each landslide type and CI based
on the intensive literature review and internal
discussion with the experts. For each sub-indicator
the panels were also required to define the score
values from 1 to 10. Score values close to 1
indicate a lower contribution to the vulnerability of
a CI and score values close to 10 indicate higher
contribution of a sub-indicator to the vulnerability.
The score value was then converted to the weight
scale from 0.1 to 1.0 using Equation 2.
Select landslide type and CI
SELECT THE INDICATORS THAT ARE
RELATED TO THE 4 COMPONENTS
C - Susceptibility of Critical
Infrastructure (CI)
E - Effect of surrounding environment
or mitigation measures
I - Intensity of landslide hazard
P - Susceptibility of people
Set the weightage value for each
indicator (range from 1 to 10)
Define the class (sub-indicator) for
each of the indicator
Equation (2)
The final estimated vulnerability value for each
CI and type of landslide was classified into several
classes. In this study, we proposed the vulnerability
class for each CI as listed in Table 3.1. The panel
was required to revise the proposed classes and
provide suggestions for improvement.
State the description of
vulnerability class
Define the risk level and its
description
Figure 2.2: Step by step instructions to fill
out the landslide vulnerability survey forms
for each CI and landslide type.
(The second part of this article will be published in
The Ingenieur Vol. 80.)
GROUP 1:
Building, Residential
& Road Aspect
GROUP MEMBERS GROUP 2:
Dam & Water Treatment Aspect GROUP MEMBERS GROUP 3:
Utility: Powerline &
Telecommunication Aspect
GROUP MEMBERS
Department/Agency: Department/Agency: Department/Agency:
• Ampang Jaya City Council
• Road Branch Public Works
Department
• Department of Civil Engineering
& Public Transport DBKL
• Department of Building Control
DBKL
• JPS [Design & Dam]
• Water Asset Management
Berhad
• Selangor Water Management
Agency
• Water Supply Department
• Uniten
• Uniten
• TNB Research Sdn Bhd
Table 2.1: Focus Group Discussion Groups.
35