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January 26, 2015
A COMPREHENSIVE APPROACH TO PRIORITIZING STORMWATER INFRASTRUCTURE IMPROVEMENTS Troy McPherson, PE, ENV SP Alan Davis, PE, ENV SP
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ACKNOWLEDGEMENTS
Steve McLaughlin, PE (City of Virginia Beach) Stanley Smith, Jr. (City of Virginia Beach) Will Von Ohlen (City of Virginia Beach)
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AGENDA
Background
Program Overview
Methodology
Implementation
Results
What’s Next?
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City of Virginia Beach
Population – 450,000 250 Square Miles
5000 Outfalls 1200 miles of Stormwater Pipe 16 Stormwater Pump Stations
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BACKGROUND
Stormwater Infrastructure
Specific Program
Funding Source
Cave-Ins Limited Resources
Condition Assessment
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PROGRAM OVERVIEW
GOALS
1. METHODOLOGY
2. IMPLEMENT
3. RESULTS
4. APPLY
Reduce Cave-Ins Extend Useful Life Fiscally Focused
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METHODOLOGY
Overall Pipe Rating =
Probability of Failure
Risk Modifier =
Magnitude of Loss
RISK BASED
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CAVE-IN NOTIFICATION
METHODS
CITIZENS
CITY STAFF OTHER PROJECTS
METHODOLOGY
Prioritization Score Factors
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ABOVE GROUND DEFECT CODES
PAVEMENT CONDITION
SURFACE CONDITION
STRUCTURE INTERFACE
DEFECT CORRELATION
Prioritization Score Factors
METHODOLOGY
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CAVE-IN FAILURE FACTORS
WATER / SOIL INFILTRATION
HIGH WATER TABLE
TIDAL SYSTEMS
STRUCTURE INTERFACE
LIFTING HOLES
GASKET-LESS JOINTS
DEFLECTED JOINTS
Prioritization Score Factors
METHODOLOGY
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RISK MODIFIERS
ROADWAY TYPE
GEOGRAPHIC
PIPE SIZE
PIPE MATERIAL
Prioritization Score Factors
METHODOLOGY
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Segment Grade Score Defect Grade ∑ Defects per
Grade
Overall Pipe Rating
∑ Segment Grade Scores
Prioritization Score
Overall Pipe Rating
∑ Risk Modifiers
METHODOLOGY
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Prioritization Threshold
Min. Grade 5 Effective
Grade ∑ Min. Risk Modifiers
METHODOLOGY
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METHODOLOGY
METHODOLOGY
QUANTITATIVE RISK ANALYSIS
IMPROVEMENT PRIORITIZATION RISK THRESHOLD
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IMPLEMENTATION
Residential Subdivision (Green Run) 100,000 LFT
Residential Subdivision (Glenwood) 100,000 LFT
Residential Subdivision (Pine Ridge) 40,000 LFT
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GREEN RUN & GLENWOOD BASINS
Combined Total 200,000 LFT 15-24 Inch
Outfall to
BMPs
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Field
2- Person Crew
Document Defects
Immediate Concerns
Daily Records
IMPLEMENTATION
ABOVE GROUND DEFECT CODES
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Office - CCTV
5- Reviewers
In-House Review Software
Document Defects
Preliminary Repair Methods
IMPLEMENTATION
CAVE-IN FAILURE FACTORS
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IMPLEMENTATION
Above Ground Defects
CCTV Defect Codes
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IMPLEMENTATION
Above Ground Defects
CCTV Defect Codes
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IMPLEMENTATION
RISK MODIFIERS
Office / Field
GIS Data
Field Observation
Institutional Knowledge
Preliminary Repair Methods
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IMPLEMENTATION
DEFECTS PACP CODING SUPPLEMENTAL CODING
REHABILITATION RECOMMENDATIONS
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IMPLEMENTATION
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REHABILITATION METHODS
∑ Segment Costs
75% of CIPP (Lining Cost)
Full Length CIPP
(Lining)
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RESULTS SUMMARY
17,928 LF
Unresolved
29,693 LF
Rehabilitation
55,247 LF No
Action
Green Run 100,000 LF
[VALUE] Unresolv
ed
[VALUE] Rehabilit
ation
[VALUE] No
Action
Glenwood 100,000 LF
$3,300,000 Savings
$1,900,000 Savings
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WHAT’S NEXT?
Rehabilitation Green Run 43,561 LFT
Rehabilitation Glenwood 29,693 LFT
Condition Assessment Pine Ridge 40,000 LFT
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THANK YOU…
QUESTIONS?