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Mel Meng, PE, GISP, DLZ
Andrea Remias, NEORSD
Claus Jeffrey, CDM Smith
USING GIS TO IDENTIFY CRITICAL PIPES IN
THE COLLECTION SYSTEM
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Acknowledgement
Andrea Remias, Project Manager, NEORSD
Ms. Andrea Remias is a project manager in the Engineering &
Construction Department at the Northeast Ohio Regional
Sewer District. She has been managing the implementation of
asset management since 2005. The District is in the last 5
months of the Phase I Implementation project which was a 3 ½
year effort to ultimately produce 50-year repair and renewal
plans for all 10,000 plant and collection system asset at the
District.
[email protected] 216.881.6600
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Jeff Claus
Management Consultant, CDM Smith
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Asset Management (AM) Implementation Phase I Project
The 10-year implementation plan was based on a study where
the District’s asset-related practices were evaluated and
benchmarked against “world’s best practices”
Main outcome of Phase I: 50-year Repair and Renewal for all
plant and collection system assets
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>300 mi
>6000 pipe segments
61 municipalities
Cuyahoga, Summit
Lake and Lorain
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Asset Management
“Meeting customer expectations while
minimizing cost and risk” -- I think, therefore I AM
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LOS
RISK COST
OR….
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Consequence
Of
Failure
Probability
Of
Failure RISK
“Risk is the potential that a chosen action or activity
will lead to a loss.” - Wikipedia
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Asset Management>>Risk>>Criticality
Consequences of failure
Social
Environmental
Financial
http://latimesblogs.latimes.com/lanow/2011/01/big-sinkhole-swallows-car-near-whittier-
rain-might-be-the-cause.html
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Criticality Scoring
The sum of the three factors
Employee /Public Safety (1, 2, 3)
Regulatory compliance/Public Impact (1, 2, 3)
Fiscal Impact (1, 2, 3)
Challenges
Define criticality
Quantify the intangible
Measure the invisible
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Employee/Public Safety
1.D>500ft and
not under road and
not close to railroad
2.200ft<D<500ft or
under a local road
3.D<200ft or
under a highway/arterial road or
close to railroad
1.No threat
2.Injury
3.Death
D: the distance to critical locations
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Regulatory compliance/Public Impact
1.Dia< 48” and D>100’
2.Dia< 48” and D<100’
3.Dia> 48” and D<100’ or Forcemain
1. No violation
2. Violations without fines
3. Violation with penalties
D: distance to critical location or river
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Fiscal Impact
1.Dia< 48” or d<25’
2.Dia> 48” or 25’<d<50’
3.Tunnel or Over River or
Depth>50’
1. < $100,000
2. $100,000 - $1M
3. >$1 M
d: Pipe depth Dia: pipe diameter
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Criticality Scoring
1 2 3 Employee/
Public Safety
No threat Injury Death
Regulatory
Compliance/
Public Impact
No
violation
Violation with
fine
Violation with
penalties
Fiscal Impact <$100,000 $100,000-1M >$1M
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Doubts
You cannot quantify intangible things like environmental
impact in dollar values
It is so hard to estimate the criticality, what happen when a
pipe collapsed is too complicated to estimate with such
simple calculations
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Workshops
Participants
Engineers
Operators
GIS/IT staff
Consultants
Collective Knowledge
Unique about the system
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Operational Definition
Visible and tangible
Amount of discharge
Extent of surface damage
People and structures impacted
Construction Complexity
Material, size and depth of the pipe
Location context
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Operational Definition
Measurable
Pipe physical attributes
Pipe Spatial attributes (Spatial context)
Proximity to buildings, rivers, utilities, roads, railroads
Proximity to population
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Operational Definition
Feasibility
Data availability
Data accuracy
Processing requirement
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Sewer
Critical
Location
Road
Spatial Context
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Results
Large diameter
deep pipes
Close to
critical
locations
Forcemain
Large diameter deep
pipes
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Spatial Join
“Joins attributes from one feature class to another based on a spatial
relationship.”
--ESRI Help Documentation
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Automation
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Conclusion
Criticality is an important metric of a collection system
Defining criticality is an iterative collaboration process
among engineers, operators , other staff and consultants,
which convert conceptual ideas into concrete calculations
GIS is a powerful and effective platform for managing,
processing and automating the criticality calculation
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Questions
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Reference
I think, therefore I AM, 2011 OWEA Annual Conference,
June 22, 2011, Kevin Campanella, John Rogers
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Employee /Public Safety
1. No threat
2. Injury
3. Death or significant injury
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Regulatory compliance/Public Impact
1. No violation, no impact
2. Violations without fines, impact of hours
3. Violation with penalties, impact more than 1 day
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Fiscal Impact
1. < $100,000
2. $100,000 - $1 Million
3. >$1 Million