Master thesis project
“Development of a decision-making model for the external
costs of pipelines renovation projects”
Camila Nunes Vasconcelos
16th March 2017
Contents
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My background
Thesis supervision
Definitions
Research background
Research formulation
Methodology
Data collection: interviews
Valuation example
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My background
2008-2013: The Federal University of Bahia (Brazil)
BSc. Environmental and Sanitary Engineering
2012: University of Liege (Belgium)
Exchange student
2014-2015: The Federal University of Bahia (Brazil)
BSc. Civil Engineering
2015-2017: University of Twente (The Netherlands)
MSc. Civil Engineering and Management, Construction Management
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Thesis supervision
November 2016 – July/august 2017
Deltares
Drs. C.C.D.F. (Derk) van Ree
University of Twente
Dr. S. H. (Saad). Al-Jibouri
Dr. Faridaddin Vahdatikhaki
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Definitions
External costs or social costs?
• Social or external costs are associated with the negative effects of
construction projects which are born by the society (Matthews,
Allouche & Sterling, 2015)
• Social costs cannot be classified as either direct or indirect costs
(Allouche et al, 2000)
• Social costs are those for which the society usually will not be
compensated
• Social costs affect the communities nearby the construction site,
the environment and surrounding infrastructure (Matthews and
Allouche, 2010).
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Research background
• Social costs are difficult to incorporate in the decision-making
process and represent in terms of monetary units
• Total cost of a construction project: direct costs, indirect costs and
social costs
• Previous research: Bsc. thesis “Externe kosten bij
leidingrenovatie: Onderzoek naar de projecteigen kosten van open
sleuf en sleufloze renovatie” (Alkema, 2015)
•
Results: matrix to support decision-making by comparing the
social costs of trenchless technologies and open trench excavation
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Research formulation
Research problem:
“There is a need for Dutch companies and governmental agencies to
assess their utilities projects based on total project costs, which
include the costs to the society and environment.”
Research question:
“How can social costs be considered in the selection of methods in
pipelines renovation projects?”
Research objective:
“To develop a model that incorporates social costs in the evaluation of
different methods for pipelines renovation projects.”
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Methodology
1. Literature review: identification of social costs related to
TT and OT projects
2. Identify the input data (interviews)
3. Data analysis
4. Implementation: prototype development
5. Verification
6. Validation of the model: experts
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Research scope
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Research scope
New installation
Rehabilitation
Trenchless
Renovation
Open trench
Trenchless
Non-structural
Structural
Wide trench
Directional drilling
Cement mortar
lining
Close-fit sliplining
Narrow trench
Pipejacking &
microtunneling
Epoxy lining
Spiral wound
lining
Mole Ploughing
Auger boring
Polyurethane
lining
CIPP lining
Vacuum
excavation
potholing
Pipe ramming
Woven hose lining
Replacement
Slip lining
Joint grouting
Pipe bursting
Localized sealing
Pipe splitting
Potholing for local
repair
Pipe reaming
Flood grouting
Pipe extraction
Impact moling
Pilot tube
Underground construction techniques. Source: ISTT, 2016
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Repair
Social costs
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Valuation methods: key figures (kengetallen)
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Example valuation method: traffic delay costs
1) Delay time (hours)
𝑫𝑻 =
𝑳𝑾
𝑺𝑾
−
𝑳𝑵
𝑺𝑵
LW = Length of work zone including detours (km)
SW = Speed through work zone (km/h)
LN = Length of working zone in normal situation (km)
SN = Normal speed (km/h)
2) Cost of Delay per vehicle (euros/vehicle)
𝑪𝑫 = 𝑫𝑻 × 𝑽𝑶𝑻 × 𝑨𝑵𝑷
DT = Delay Time (h)
VOT = Value of Time (€/person x hour)
ANP = Average Number of Persons per Vehicle (person/vehicle)
3) Traffic Delay Costs (euros)
𝑻𝑫𝑪 = 𝑪𝑫 × 𝑵𝑽𝑫 × 𝑫
CD= Cost of Delay (€)
NVD = Number of vehicles per day (vehicle/ day)
D = Project duration (days)
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Example valuation method: traffic delay costs
Trenchless renovation technologies
Delay time
0,02
hour
1
min
0,1906
€/ vehicle
Delay time
0,02
hour
Value of time
9,53
Average number of persons per
vehicle
Open trench
0,02
hour
1
min
0,1906
€/ vehicle
Delay time
0,02
hour
€/person x hour
Value of time
9,53
€/person x hour
1,2
person/vehicle
Average number of persons per
vehicle
1,2
person/vehicle
13.342,00
euros
26.684,00
euros
Cost of delay
0,1906
€/ vehicle
Cost of delay
0,1906
€/ vehicle
Number of vehicles per day
10000
vehicles/day
Number of vehicles per day
10000
vehicles/day
7
days
14
days
Cost of delay
Total traffic delay costs
Project duration
Delay time
Cost of delay
Total traffic delay costs
Project duration
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Data collection: interviews
Interviewees:
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Asset owners
•
Engineering companies
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Contractors
•
Municipalities
Main questions:
•
•
•
•
Which social costs are relevant for open trench and trenchless pipelines projects?
How are social costs quantified?
Which data is necessary to quantify social costs and where can I get this data?
How are risk related social costs quantified (probability X severity)?
➢ accidents/ damage
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Questions or comments?
Email: [email protected]
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Thank you for your attention!
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