jason kleps, gisp · phased assessment strategy for sewers ( envirosight) planning . inspection...
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Light at the End of the Tunnel:
Implementing a Condition Assessment
Program for your Municipality
Jason Kleps, GISP
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Objectives
• What condition assessment is and why it is important
• Planning and executing an assessment project
• Analyzing your results
• Turning analysis into action
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What is condition assessment?
“The process used to describe the
condition and/or performance of a
system component.”
National Guide to Sustainable Municipal Infrastructure (InfraGuide), July 2004 pg. 2
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Benefits of a condition assessment program
• Improved public safety
• Mitigate flooding risks
• Promote economic development
• Maximize asset life
• Information-based approach to set priorities
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Benefits of a condition assessment program Avoiding this …
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Benefits of a condition assessment program And this …
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Benefits of a condition assessment program And mitigate this …
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Condition Assessment Program Cycle
Inventory & Assessment
Evaluation & Decision Making
Take Action (Rehab,
Replace, or Wait)
Needs Assessment
Planning
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Needs Assessment
• What is your current state?
• Identify available data
• GIS, CAD, drawings, reports, spreadsheets (and more)
• Identify gaps
• Identify technology and software currently being
used
• Work order systems, etc
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Planning
• Things to consider
• Database design
• Inventory methods and technology
• Assessment methodologies
• CCTV
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Planning
Database Design • Local Government Information
Model (LGIM) • ESRI’s preferred data model • Scalable • Preconfigured domains and
feature classes • Modify as needed
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Planning
Inventory technology • Collector for ArcGIS
• Mobile data collection app • Rich editing environment • Supports offline editing • Sync back in office • New version of app released in 2018
• External GPS • Submeter accuracy • Bluetooth to tablet • ~$3,000 per unit
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Planning
Inspection technology • Zoom cameras
• Supplements surface inventory • Provides shots of pipes from structure • Photos limited to straight-line pipe • Helps lower overall project cost by
reducing CCTV scope
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Planning
Inspection technology • Zoom cameras
• Phased Assessment Strategy for Sewers (PASS)
Phased Assessment Strategy for Sewers (Envirosight)
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Planning
Inspection technology • CCTV
• Pipe inspections • Reports and videos • Can be linked to GIS and ratings symbolized on
map • ~$1.50 LF • Heavy cleaning expressed as an hourly rate
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Planning
Inspection technology • CCTV
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Planning
Inspection technology • CCTV
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Planning
Inspection technology • CCTV
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Planning
CCTV Scoping • By Size
• 18” – 54”
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CCTV Scoping By Size (18” to 54”)
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Planning
CCTV Scoping
• By area • Entire systems,
regardless of size
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CCTV Scoping By Area
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Planning
CCTV Scoping
• By criticality • Major roads • Critical facilities
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CCTV Scoping By Criticality – Major Roads
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CCTV Scoping By Criticality – Critical Facilities
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Assessment methodology
NASSCO • National Association of Sewer Service Companies
• Formed in 1976 • Member based • Sets industry standards for the assessment and rehabilitation of
storm, sanitary, and water infrastructure
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Assessment methodology
PACP and MACP • Pipeline Assessment & Certification Program • Manhole Assessment & Certification Program • Started in 2002 • Goal was to introduce standardization and consistency into
condition evaluations • Derived from England’s Water Research Centre (WRC) codes • Certification required every 3 years
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Assessment methodology
PACP and MACP • Industry standard for condition assessment • Large code library • Organized into 4 code “families”
• Structural • Operation & Maintenance (O&M) • Construction Features • Miscellaneous Features
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Assessment methodology
Structural Defect Codes
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Assessment methodology
O&M Defect Codes
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Assessment methodology
Construction & Miscellaneous Defect Codes
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Assessment methodology
PACP Codes • Codes used to describe defects or observations consist of 3 items:
• Group – broad category (i.e. R – Roots) • Descriptor - further defines the defect (F – Fine, M – Medium, B – Ball, or
T - Tap) • Modifier – extension of the Group/Descriptor Code and provides more
detailed information (B – Barrel, J – Joint, L – Lateral)
• So, the code RMB would indicate a Root Medium entering through the Barrel of the pipe.
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Analyzing Your Results
PACP Condition Grades • 5: Most significant defect grade • 4: Significant defect grade • 3: Moderate defect grade • 2: Minor to moderate defect grade • 1: Minor or no defects Defect grades are already determined by the software; you just have to make sure you are coding defects correctly!
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Assessment methodology
Point and Continuous Defects • Point defect – a discrete defect < 3 feet in length • Continuous defect
• Truly continuous – 3 feet or longer • A crack running longitudinally along the pipe at the 12 o’clock for 42 feet
• Repeat continuous – at 3 of every 4 joints • Infiltration Weeper at every pipe joint for 70 feet
• Continuous defects are noted as 2 separate entries with respective “Start” and “End” labels, along with the stationing
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Assessment methodology
Anything you could possibly encounter in a storm pipe can be found in the PACP Code Library.
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Assessment methodology
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Assessment methodology
Assessment methodology • NASSCO software
• Commercial options available • Complies with NASSCO standard (NASSCO-certified) • Import into software and export to GIS • Data entry forms • Generate inspection reports
• Or you can custom design one yourself
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Inventory & Assessment
Inventory – Surface • Physical data (i.e. feature attributes)
• Location • Feature Type • Pipe inventory
• Pipe size • Invert measurements • Material
• Photos
• Operational data (i.e. conditions)
• Structural integrity • Functional integrity (O&M) • Construction features
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Inventory & Assessment
Inventory - Subsurface • Manned entry
• Use measuring wheel to record
stationing from known entry points
• Record defects in related table
• Tabular data can then be converted
into points along the line (linear
referencing)
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Analyzing Your Results
Rating System • Quick Rating
• Overall Rating – sum of all grades
• Rating Index – Overall Rating
divided by number of defects
Overall Rating # Defects
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Analyzing Your Results
Surface Ratings • Defect scores summarized separately
for each structure • Structural rating • O&M rating • Combined rating
Defect 1 Defect 2 Structure Rating
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Analyzing Your Results
Subsurface Ratings • Using linear referencing …
• Point defects plotted as point features • Continuous defects plotted as line features
• Defect scores summarized separately for each segment
• Structural rating • O&M rating • Combined rating
• Provides segment rating
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Evaluation & Decision Making
Calculating Likelihood of Failure (LOF) • Derived from the first 2 numbers of the Quick Rating • Scale is 1 to 6, with 1 being the least likely, 6 the most
LoF = First 2 numbers of QOR
10
LoF = 42 10 = 4.2
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Evaluation & Decision Making
Calculating Likelihood of Failure (LOF) • If no defects recorded for feature or segment, then add 1.0
LoF = 0 10
= 1.0 + 1.0
LoF = First 2 numbers of QOR
10
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Evaluation & Decision Making
Calculating Likelihood of Failure (LOF) • If second character in the Quick Rating is a letter, than add 1.0 as well
LoF = First 2 numbers of QOR
10
LoF = 50 10 = 6.0 + 1.0
+ 1.0
Example: QOR is 5B21 (meaning 15 to 19 occurrences of a Grade 5 defect); therefore:
A = 10-14, B = 15-19, C = 20-24, etc
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Evaluation & Decision Making
Developing Consequence of Failure criteria • Size • Location (for example, crosses under major road) • Depth (the deeper the pipe, the greater the cost of repair/replacement) • Service Area • Proximity to critical facilities • Environmental impact • Public Health impact • Economic impact
Asset owner involvement is essential!
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Evaluation & Decision Making
Calculating Consequence of Failure (COF) • For each of these criteria you would assign a COF factor rating
• Scale is 1 to 6, with 1 being the least consequential, 6 the most • You would then apply a weight to each criteria • Finally, you would calculate the COF for each feature by multiplying the
factor against the weight
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Evaluation & Decision Making
Risk Assessment • Likelihood of Failure (LOF) – Determined by condition scores • Consequence of Failure (COF) - Determined by asset owner • Risk = LOF x COF
$20,000 available
$30,000 available
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Conclusion
• Assets can be managed proactively
• New technologies can augment traditional
methods
• Good assessment methods + greater
assessment frequency can help us better
understand how assets deteriorate over time
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QUESTIONS?