Interactive Decision Tree Automates Sewer Rehabilitation Planning
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1 Interactive Decision Tree Automates Sewer Rehabilitation Planning IWPCA Annual Conference June 5, 2008 Rodney Moeller, P.E., John Schroeder, P.E. BCEE, C. Timothy Fallara, P.E. & Mel Meng, P.E.
2 Agenda Overview of Livingston/James Sewer System I/I Remediation Project Sewer Coding & NASSCO PACP Condition Assessment to Prioritized Solutions Automated Decision Tree Decision Tree Demo Final Decision Tree Structure Summary
3 Agenda Overview of LJII Project Sewer Coding & NASSCO PACP Condition Assessment to Prioritized Solutions Automated Decision Tree Decision Tree Demo Final Decision Tree Structure Summary
4 Livingston/James Sewer System I/I Remediation Project 7,560-acre study area Mostly 1950s residential development City of Columbus
5 Livingston/James Sewer System I/I Remediation Project Over 3,300 sanitary sewers (150miles) 8 to 66 inches in diameter
6 Livingston/James Sewer System I/I Remediation Project 1,825 WIB complaints in last 5 years 439 WIB complaints January 2005
7 LJII Project Tasks Clean and record with CCTV all sewers (>700,000 lf) Database with PACP Defect Codes & Linked to Video Quick-Response Investigations Investigate Private & Public I/I Sources with Dye Testing Windshield Surveys Flow Monitoring & Radar Rainfall Hydraulic Modeling & Calibration Develop, Evaluate & Prioritize Alternatives Capacity Related Improvements Structural O&M Cost Estimating & Developing CIP Development of Implementation Plan
8 LJII Project Tasks Clean and CCTV all sewers (>700,000 lf) Database with PACP Defect Codes & Linked to Video Quick Response Investigations Investigate Private & Public I/I sources with Dye Testing Windshield Surveys Flow Monitoring & Radar Rainfall Hydraulic Modeling & Calibration Develop, Evaluate & Prioritize Alternatives Capacity Related Improvements Structural O&M Cost Estimating & Developing CIP Development of Implementation Plan
9 Agenda Overview of LJII Project Sewer Coding & NASSCO PACP Condition Assessment to Prioritized Solutions Automated Decision Tree Decision Tree Demo Final Decision Tree Structure Summary
10 NASSCO PACP Structural (Cracks, Fractures, Holes) Operation & Maintenance (Roots, Debris, Deposits, Infiltration) Construction Features (Taps, Seals) Miscellaneous (Pipe Change) PACP Condition Grading System
11 PACP Condition Grading System Grade 1 Excellent (No Defects) Grade 2 Good Grade 3 Fair Grade 4 Poor Grade 5 Severe
12 Sewer Main Assessment Sewer Defects Structural Cracks Fractures Broken Holes Collapses Sags
13 Sewer Main Assessment Sewer Defects O&M Roots Deposits Infiltration Sags
14 High Structural Scores (5s) Holes Deformed Pipes Collapsed Pipes Broken Pipes Surface Deterioration
15 High O&M Scores (5s) Severe Grease Root Balls Severe Deposits Infiltration Gushers
16 CCTV Database
17 Agenda Overview of LJII Project Sewer Coding & NASSCO PACP Condition Assessment to Prioritized Solutions Automated Decision Tree Decision Tree Demo Final Decision Tree Structure Summary
18 Sanitary Sewer Improvement Alternatives Hydraulic Capacity Structural O&M New Larger Pipe or Relief Sewer Point Repair Perform Periodic Maintenance & CCTV Insp. Columbus I/I Reduction Program Pipeline Rehabilitation (CIPP) Chemical Root Control Program Satellite Communities I /I Reduction Program Replace Pipe Grease Control Program
19 DRAFT Decision Chart for Livingston James Sanitary Sewer Remediation Plan CCTV Data & Model Results Does Pipe Have Sufficient Capacity? N OR New Larger Pipe or Parallel Pipe 1, 2 Does Pipe Have Major Structural Defect? Does Pipe Have Roots? N Get Satellite Community to Implement I/I Red. Program N Y Open Cut Point Repair & Relining Possible? Long Term > 5 yrs Pipe Rehab CIPP Y Point Repair N N Does Pipe Have I/I OR Y Implement I/I Reduction Program N N New Larger Pipe or Parallel Pipe? Structural Score Y Can I/I Reductions Meet Needs? Is I/I in City Limits? N Y 3, 4, 5 Y Y Are I/I Reductions Feasible? Perform Periodic Maintenance & CCTV Insp. Y Te S rm hor 1- t 5 yr s Chem. Root Control Program Pipeline Rehabilitation (CIPP)
20 Stakeholders Developed Condition & Criticality Factors to Set Priorities Stakeholders Condition Criticality Capacity Structural Maintenance Modeling PACP Grade PACP Grade Growth Needs Age Work Orders I/I Issues Corrosion Preventative Maintenance Environmental Impact Size Transportation Impact Public Health Impact Reliability
21 Priority is a Function of Both Condition and Criticality Criticality (Consequences of Failure) Priority Condition (Probability of Failure) Long-Term Mid-Term Short-Term Rehab/Replace Replace/Rehab Replace/Rehab Immediate Replace Immediate Replace 4 Long-Term Rehab Mid-Term Rehab Immediate Rehab Immediate Rehab 3 Long-Term Rehab Long-Term Rehab Mid-Term Rehab Mid-Term Rehab Short-Term Rehab 2 Infrequent Monitoring Infrequent Monitoring Regular Monitoring Frequent Cleaning/ Monitoring Frequent Cleaning/ Monitoring 1 Infrequent Monitoring Infrequent Monitoring Regular Monitoring Regular Monitoring Frequent Monitoring Mid-Term Rehab
22 Sewer Improvement Priority Timeframes IMMEDIATE (0 to 6 months) Short Term (1 to 3 years) Intermediate Term (3 to 5 years) Long Term (5 to 10 years)
23 LJII Structural & O&M Draft Recommendation Summary Operations and Maintenance Recommendations Cured-In-Place-Pipe (CIPP) Point Repair and CIPP Spot Liner Short Term Chemical Root Treatment Grease Program (FOG) Periodic Cleaning and Televising Code Point Repair Prioritization of Recommended Improvement Sewer Replacement Structural Recommendations Number of Pipes Number of Pipes Immediate A A Short Term B B Intermediate Term C C Long Term D D , ,302 Number of Pipes Total Pipes in GIS/Recommendations = 3,389
24 Agenda Overview of LJII Project Sewer Coding & NASSCO PACP Condition Assessment to Prioritized Solutions Automated Decision Tree Decision Tree Demo Final Decision Tree Structure Summary
25 Custom GIS Decision Toolset Solution Matrix Decision Tree Editor ArcMap CCTV Video Pipe Info.
26 DRAFT Decision Chart CCTV Data & Model Results Does Pipe Have Sufficient Capacity? N OR New Larger Pipe or Parallel Pipe 1, 2 Does Pipe Have Major Structural Defect? Does Pipe Have Roots? N Get Satellite Community to Implement I/I Red. Program N Y Open Cut Point Repair & Relining Possible? Long Term > 5 yrs Pipe Rehab CIPP Y Point Repair N N Does Pipe Have I/I OR Y Implement I/I Reduction Program N N New Larger Pipe or Parallel Pipe? Structural Score Y Can I/I Reductions Meet Needs? Is I/I in City Limits? N Y 3, 4, 5 Y Y Are I/I Reductions Feasible? Perform Periodic Maintenance & CCTV Insp. Y Te S rm hor 1- t 5 yr s Chem. Root Control Program Pipeline Rehabilitation (CIPP)
27 Computerized Decision Tree
28 Custom Decision Tree Editor
29 Building a Decision Tree
30 Agenda Overview of LJII Project Sewer Coding & NASSCO PACP Condition Assessment to Prioritized Solutions Automated Decision Tree Decision Tree Demo Final Decision Tree Structure Summary
31 Launch SQLTree Application
32 Open an Existing SQLTree File
33
34
35 Select GIS Layer To Process by Pressing This Button
36 Select Layer And Field to Update and Press Apply
37 Select an Attribute Node Node Information on Status Line
38 Select a Condition Node Node Information on Status Line
39 Alternate Condition Node Node Information on Status Line
40 Another Attribute Node Node Information on Status Line
41 A Condition Node Follows Node Information on Status Line
42 To Edit a Node Press This Button Node Information on Status Line
43 Change Node Attributes and Press Apply
44 Another Attribute Node Node Information on Status Line
45 An Outcome Node SQL Statement on Status Line
46 Another Outcome Node SQL Statement on Status Line
47 To Test a Query Press This Button SQL Statement on Status Line
48 The Select Query Is Run on the GIS Layer The Number of Records in the Selection Set Is Reported
49 Outcome Node Is Updated with Number Of Records Affected SQL Statement on Status Line
50 To Update the GIS Layer with All of the Queries, Press This Button
51 Press Yes To Proceed
52 The Number of Queries Run
53 The Number of Records Updated By Each Query
54 All Outcome Nodes Are Updated with Number Of Records Affected To Apply a Legend To the GIS Layer, Press This Button
55 Change Legend Attributes and Press OK
56 End Result: Updated GIS Layer With Color-Coded Legend
57 Agenda Overview of LJII Project Sewer Coding & NASSCO PACP Condition Assessment to Prioritized Solutions Automated Decision Tree Decision Tree Demo Final Decision Tree Structure Summary
58 Decision Tree - Collapsed
59 Definition Module
60 Decision Module
61 Prioritization Module
62 Engi neer Ove rride Mod ule Engineer Override Module
63 Review Module
64 Decision Tree - Collapsed
65 LJII Structural & O&M Draft Recommendation Summary Operations and Maintenance Recommendations Cured-In-Place-Pipe (CIPP) Point Repair and CIPP Spot Liner Short Term Chemical Root Treatment Grease Program (FOG) Periodic Cleaning and Televising Code Point Repair Prioritization of Recommended Improvement Sewer Replacement Structural Recommendations Number of Pipes Number of Pipes Immediate A A Short Term B B Intermediate Term C C Long Term D D , ,302 Number of Pipes Total Pipes in GIS/Recommendations = 3,389
66 Summary of LJII Costs for Recommendations Immediate Short Term Intermediate Term Long Term Total Cost Backflow Prevention &/or Sump Pump Storage Sewer Replacement Point Repair Cured-In-Place-Pipe (CIPP) Point Repair and CIPP Spot Liner Short Term Chemical Root Treatment Grease Program (FOG) Periodic Cleaning and Televising $ 8,000,000 $ 4,100,000 Short, Mid, Long-Term Totals Combined Recommendations Private and Public Inflow & Infiltration Reduction Program A A B B C C D D Sewer Replacement Code Relief Sewer Prioritization of Recommended Improvement Operations and Maintenance Recommendations Structural Recommendations Hydraulic Capacity Recommendations $ 1,983,014 $837,138 $568,477 $0 NA $0 $0 $0 $0 $7,413,434 NA $60,000 $66,237 $10,485 $90,058 $ 27,275,224 $1,315,502 $3,499,294 $ 1,330,000 $ 5,800,000 $ 4,100,000 $0 $871,665 $4,754,513 NA $0 $97,435 $14,298 $78,222 $ 16,856,178 $ 2,670,000 $ 2,900,000 $0 $909,564 $7,064,169 NA $0 $103,195 $77,211 $501,751 $ 13,543,733 $19,232,116 NA $60,000 $266,867 $101,995 $670,030 $ 59,658,148 $12,000,000 $8,700,000 $8,200,000 TBD $2,152,640 $5,849,000 every 2 years Total Hydraulic Capacity Construction Costs = $ 28,900,000 Total Structural Construction Costs = $ Freq. varies every 2 years from 6 mos. to 10 years 27,293,756 Total Annual O&M Costs 1 = $ 577,399
67 Agenda Overview of LJII Project Sewer Coding & NASSCO PACP Condition Assessment to Prioritized Solutions Automated Decision Tree Decision Tree Demo Final Decision Tree Structure Summary
68 Summary The Decision Tree process is: Efficient User Friendly Consistent Automated with User Overrides Transferable
69 Questions?
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