Sewer Network Asset Analysis for Rehabilitation and Spill Prevention DARREN EASTALL/DEKALB COUNTY, DWM SARAH BRANNON/CH2M BURHAN SHAIKH/CH2M GAVIN RICHARDS/R2T 6/29/2017 1 DeKalb County, GA Michael L. Thurmond, Chief Executive Officer Department of Watershed Management Scott A. Towler, P.E., Director
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Sewer Network Asset Analysis for Rehabilitation and Spill Preventionproceedings.esri.com/library/userconf/proc17/papers/20… · · 2017-06-29Sewer Network Asset Analysis for Rehabilitation
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Sewer Network Asset Analysis for Rehabilitation and Spill Prevention
DARREN EASTALL/DEKALB COUNTY, DWM
SARAH BRANNON/CH2M
BURHAN SHAIKH/CH2M
GAVIN RICHARDS/R2T
6/29/2017 1
DeKalb County, GAMichael L. Thurmond, Chief Executive Officer
Department of Watershed ManagementScott A. Towler, P.E., Director
Consent Decree (CD) Program Background, Status and Approach – Darren Eastall
Tools and Project Coordination – Sarah Brannon
Assessment and Data Management – Gavin Richards
Data Scoring, Decision Logic, and Rehab Plans – Burhan Shaikh
Field implementation sequencing▪ Improves compliance of
data quality standards
▪ Prioritizes “escalated” areas
▪ Promotes complete basin coverage before additional assignment
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Approach required by Consent Decree
Tier 1 Assessment:▪ Manhole inspection
▪ Zoom camera inspection
▪ Smoke/dye testing
▪ Acoustical testing
Tier 2 Assessment:▪ Closed-Circuit Television (CCTV)
▪ Sonar/TISCIT
Tier 3 Assessment:▪ As needed
▪ Robotics/advanced
Requires data systems planning, development, and integration
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Tiered Assessment Approach
Tier1
Tier 2
Tier 3
Approach required by Consent Decree
Tier 1 Assessment:▪ Manhole inspection
▪ Zoom camera inspection
▪ Smoke/dye testing
▪ Acoustical testing
Tier 2 Assessment:▪ Closed-Circuit Television (CCTV)
▪ Sonar/TISCIT
Tier 3 Assessment:▪ As needed
▪ Robotics/advanced
Requires data systems planning, development, and integration
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Tiered Assessment Approach
Tier1
Tier 2
Tier 3
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Data Delivery from Receipt to Accepted
Assign work by technology▪ Acoustic, MCA, Smoke, Dye,
CCTV, TISCIT
▪ Point repairs, MH raising
QC data (steps, 10% QC)▪ QC tools, visual check
Data upload (SCREAM)
Closeout work orders and ready for rehab review▪ Sync between work orders and
uploaded data
▪ QC’d databases then prepared for rehabilitation packaging
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Integrated Enterprise Software/Hardware Platforms Support Assessment and Capacity Applications/Tools
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Note:WO = Work OrderLOF = Likelihood of FailureDb = Database
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How Scores are Assigned
Inspection Data (NASSCO PACP/MACP Format)▪ Defects (Structural, Maintenance)▪ Defect location (Joint, Clock Position)▪ Defect type (Defects, Connections, Continuous)
Scoring (LOF)▪ Defect scores are based on NASSCO PACP/MACP standards▪ Defect scores have a scale and vary between Base and Max score▪ Scores are never lower than the worst defect score▪ Scores range from 0 (no defects) to 100 (collapse).
COF▪ Proximity to water bodies (Rivers, Lakes, Streams)▪ Proximity to critical facilities (Schools, Hospitals, Public Health)▪ Gravity main attributes (Diameter)
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How Scores are Assigned (cont.)
Condition scoring:▪ Provides method of
combining scores from multiple inspections on the same asset
▪ Converts scores (1-100 scale)
▪ Facilitates effective data manipulation
▪ Facilitates ranking and rehab prioritization
Condition and risk thresholds:▪ Provides basis for Tier 2