Integrating Asset Management Principles to Watershed Management: A Risk-Based Asset Management Approach to Stormwater Assets

Transcription

1 MWEA Conference June 23, 2015 Integrating Asset Management Principles to Watershed Management: A Risk-Based Asset Management Approach to Stormwater Assets Presenter: Mark Van Auken, PE, CMS4S, ENV SP ARCADIS Stormwater/MS4 Discipline Leader

2 Agenda Need for Stormwater Asset Management Risk-Based Linear Asset Work Stormwater Risk-Based Asset Management Case Studies Questions?

3 Historically Stormwater Asset Work Has Been Regulatory or Data Driven MS4 Permitting Collection system/outfall Water quality focused Data/GIS Stormwater infrastructure O&M focused

4 Why is SW Asset Management Needed? Regulatory System Knowledge Fiscal Health & Safety

5 An Overriding Reason for Stormwater Asset Management is Flood Control NOAA estimates an average of $8.2 billion in damages from flooding each year in the U.S.

6 A Move to A More Holistic Review is Needed Water quality Asset inventory Holistic focus Look at both performance and criticality

7 USEPA s 10 Step Asset Management Process Provides a Framework for Integrated Planning

8 EPA s 10-Step Asset Management Process and MAP-21 Have Many Similar Elements Category EPA 10 Step Process DOT 8 Step Process Asset Inventory & Condition Assessment 1 & 2 1 Program Objectives and Level of Service 5 2 & 3 Residual Life Determination 3 3 Life Cycle Costs 4, 7 & 8 4 Gap Analysis 5 3 Risk Management Analysis 6 5 Financial Plan 9 6 Investment Strategies 9 7 Asset Management Process Enhancement 10 8

9 Risk-Based Asset Management Process Uses Plan-Do-Check-Act Cycle Inventory Assets Fund the Program Assess Condition Determine CIP Assess Criticality Water and sewer line assessment is well ahead of stormwater Determine Maintenance Program Set Targets for Service Levels Determine Remaining Life and Replacement Cost Assign Risk

10 A Well Defined Asset Management Structure is Critical ASSET GROUP Junctions/ Chambers Pipes Pumps ASSET TYPE Pipe Pipe Inlet Pipe Outlet Manhole Catch basin Junction box Drop inlet Pump Gate Valve ASSET COMP- ONENT Manhole Catch basin Headwall Flume Walls Chimney Lid Motor (if < 100 HP pump) Known Assets

11 A Well Defined Asset Management Structure is Critical ASSET GROUP Open Linear Systems BMPs/GI ASSET TYPE Ditch Channel Swale Rain gardens Bioswales Wet ponds Dry ponds Constructed wetlands Manufactured devices ASSET COMP- ONENT Check dams Vegetation Forebay Overflow/riser Channel Vegetation Structure protection New Assets

12 A Key Focus of the Asset Management Process is Risk Based Evaluations Risk Is a Simple Equation: Probability * Consequence

13 Condition Assessment Helps Determine Probability of Failure Condition Type Failure Mode Description Assessment Method Capacity Does not meet demand (flow, loading, storage volume, etc.) Test or Desktop Performance Level of Service Does not meet functional needs (regulatory permits, customer commitments) Desktop Efficiency Not lowest cost alternative (labor, maintenance, obsolescence) Desktop Physical Mortality Current state of repair and operation as influenced by age, historical maintenance and operating environment Test, Visual, Desktop, Modeling 13

14 POF is Higher Value of Physical and Performance Score Define Condition Scoring Criteria for Physical and Performance Pipe/Culvert/Outfall Structural, Erosion, Trash, Sedimentation, Odor, Algae, Etc 14 Pipes / Culverts / Outfalls Structural (PACP) Erosion Trash Sedimentation None (no/minor defects, failure is unlikely) None (No erosion near barrel observed) None (No trash or debris present) None (No sedimentation present) None (No odor Slight (minor defects, pipe is unlikely to fail for 20+ years) Slight (Slight erosion near barrel, no imminent concern on condition of barrel) Slight (Limited trash and/or debris present) Slight (Limited sedimentation) Slight (Limited odor detected, may be sign Moderate (has moderate defects and will likely fail in the next years) Moderate (noticeable erosion near barrel that could lead to future collapse or pipe failure) Moderate (Trash and/or debris present, but will not cause flooding or inhibit O&M or emergency operations) Moderate (Sedimentation present, but will not cause flooding or inhibit O&M or emergency operations) Moderate (Detectable odor present, likely sign of Severe (has severe defects and will likely fail in the next 5-10 years ) Severe (severe erosion/undercutting around barrel, collapse or failure could oocur) Severe (Trash and/or debris present that will likely cause flooding or inhibit O&M or emergency operations) Severe (Sedimentatoin present that will likely cause flooding or inhibit O&M or emergency operations) Severe (Severe odor present, definite sign Failure (has failed or will likely fail in the next few years) Failure Failure Failure

15 Physical Condition Examples Condition Score 1 Condition Score 5

16 Performance Examples Capacity Regulatory O&M/Availability Obsolescence

17 Roadway Culvert Asset Example Shows Rationale for Using Max Condition Score

18 Consequence of Asset Failure is Evaluated by Triple Bottom Line (TBL) Analysis Triple Bottom Line Economic Social Sustainability Environmental

19 Risk Supports Optimization of Capital Improvement Programs Probability of Failure x Consequence of Failure = Risk Score Failure Mode Consequence Mortality Economic Level of Service Social / Safety Capacity Environmental Efficiency TBL:Triple Bottom Line Right projects at the right time

20 Risk Assessment Provides Apples to Apples Comparison Across All Assets District Location R-O-W Group Type Physical Score Performance Score Condition Score COF Score Risk Score 2 City name 2 City name 2 City name DOT Pipe Pipe DOT Pipe Outfall City Pipe Pipe City name DOT Open Linear Ditch City name DOT BMP/GI Filter strip

21 Service Levels Drive Needs and Also Build Transparency and Stakeholder Relationships SL Category Reliability Issues sewer/outfall blockages and collapses overflows backups Water Distribution Breaks and Leaks Per 100 Miles Per Year 15 Quality odor, water, and trash complaints Customer Service Regulatory event response call center performance discharge permit compliance water quality compliance Current Performance Trends and Issues Stable performance driven by rehabilitation and renewal program of 100 miles per year. Continued focus on oldest cast iron pipe and worst served areas performance impacted by spike of 75 third party damage incidents during downtown light rail construction.

22 Sample Service Level and Supporting Maintenance Performance Measures Strategic Plan Elements LOS Category and Measures 1 2 Ensure system and asset reliability and minimize interruptions Provide high quality service and effective response Stormwater Collection LOS X1 Collapses / Blockages Per 100 Miles LOS X2 Property Flooding LOS X3 Discharge Compliance LOS X4 Event Response Time Key Performance Indicators Operations and Maintenance Number of feet of storm sewer line cleaned Number of times assets were inspected Ratio of PM/CM work orders Work order completion ratio

23 Risk Assessment Supports Capital Funding Decisions

24 Short and Long Term Financial Needs Drive Program Funding Structure Risk Driven and Optimized Cost (Replacement, Rehabilitation, and Maintenance)

25 Business Case Analysis Supports Project Prioritization Determine which projects or alternatives have the highest net financial benefit to the utility Considers the most important and measurable project costs and benefits Considers Risk for existing assets and Risk of not acting Sustainability Economic

26 Business Case Templates Collect Information to Score/Prioritize Projects Full Business Case Includes: 1. Funding Sources 2. Project Summary and Description 3. Strategic Plan Alignment 4. Service Level Impacts 5. Project Alternatives Evaluated 6. Condition, Consequence of Failure and Risk Analysis 7. Project Cost Estimates 8. Project Priority Scoring

27 Common Set of 10 Criteria Established to Prioritize All Projects Based on Risk and TBL Project Priority Score 1. Asset Physical Condition 2. Asset Performance Condition 3. Strategic Alignment 4. Financial Returns 5. Economic / Financial Considerations 6. Public Image Impacts 7. Service Level/Reliability Impacts 8. Public/Employee Safety Impacts 9. Environmental Impacts 10. Efficiency/Energy Impacts High Priority CIP Projects Med Priority Project Number Low Priority Criteria are weighted to calculate an overall score

28 New York DEP Buried Infrastructure Asset Management Program

29 NYCDEP Pipeline Project Focused on Renewal/Replacement for Next 50 Years Evaluate useful life and condition for water, sewer (combined) gravity mains, and stormwater mains using existing information Utilize and configure the KANEW Predictive Model to forecast the 50 year renewal and replacement needs Create guide documents and tools for NYCDEP for the overall process

30 Service Levels Were Established to Define End of Pipe Life Utility Service Level (SL) SL Measure AWWA Study - Large Utilities Water Reliability (Break Rate) Breaks / 100 miles / year Top Q =16 Median = 33 Bottom Q = 68 Sanitary Efficiency (Work Order Rate) WOs / 100 miles / year N/A Internal Comparison Stormwater Efficiency (Work Order Rate) WOs / 100 miles / year N/A Internal Comparison Levels can be established or different COF values

31 Work Orders from the City s Hansen System Were Used to Predict Condition Score Condition Score 1 (very good) to 5 (very poor) Consistent with PACP scoring scale Scores assigned based on performance versus current system average service level Condition Criteria Current WO Efficiency Rate Metric: Service Level Work Orders /100 mi / yr Current WO level < to to to 4.16 > 4.16

32

33 DC Water MS4 Outfall Inventory Program

34 MS4 Outfall Inspection Program Was Used to Develop a Prioritized O&M Program Develop and implement an Outfall Repair Schedule to ensure all outfalls are in good repair by 2022 Total MS4 Outfalls = 587

35 Tablets with AssetHound Program Were Used to Collect Field Data

36 Inspection Form Included Condition Assessment Criteria

37 Outfall Ranking Example #1 Presenters TBD Stream Bank/Pool: 2 x 1 Some Erosion Structure: 0 Excellent/Like New Criticality: 0 Normal TOTAL SCORE: 2

38 Outfall Ranking Example #2 Stream Bank/Pool: 2 x 3 Severe Erosion Structure: 3 Very Poor Criticality: 0 Normal TOTAL SCORE: 9

39 Use of AssetHound Allowed DC Water to Achieve Objectives Which Outfalls to Fix? Total Score No. of Outfalls Percent Repair Priority % None % Medium % High Total %

40 Chesterfield County, VA Watershed Management Program

41 Midlothian Drainage District Served as Beta Test for County-Wide Assessment Less than 2 square miles in area District contains 37 stormwater structures Risk-based SW asset assessment is beta test for rest of county

42 Stormwater Assets Evaluated Were BMPs and Open Channels Stormwater Assets: Detention basins 6 Retention basins 4 Storm filters 3 Underground pipe 1 Filterra 23 Streams/Channels 2

43 Condition Ratings Were Developed for All Stormwater Asset Types Pipes / Culverts / Outfalls BMPs / GI Open Channels / Streams Condition Assessment Rating Object ID Location ID Asset ID Technology/ Type Structure Number Structural Problem Erosion/ Sedimentation Vegetation Clogging Trash Pretreatment Device Inspection Comments Detention Fenced but unlocked, 3' to top of trash rack, odorous Detention WCVE concrete outlet structures with slot drains at grade. No inlet into pond, berm around perimeter Retention Home Depot Fenced but unlocked, section of fence missing. Heavily silted, oil sheen on water Detention Locked behind 6' fence. Property management said Chesterfield County has the key. Pond is overgrown and doesn't appear to have any inlet or outlet structures Extended Detention # Sedimentation issue: 1 inlet causing scour, 2 others are silted in Extended Detention # Concrete inlet pointed directly at outlet, PVC inlet silted Filterra F Curb inlet coming in Storm Filter Sedimentation issue Detention Completely overgrown and silted in Retention # Fenced in, could not gain access. Four roof drains appear to drain in to pond as well as whatever over land surface flow enters Retention # Fenced in, could not gain access

44 Water Quality Was a Very Important Evaluation Criterion

45 Stormwater BMPs Had Low Criticality Compared to Other Stormwater Assets Which Assets to Repair/Retrofit? Total Score No. of Assets Percent Repair Priority % None % Low % Medium % High Total %

46 State DOT MS4 Asset Management Program

47 Risk Based Stormwater Asset Management Meets MAP-21 Requirements Gathering data for 25,000 assets/year Assets include: Pipe systems Open linear systems BMPs/GI Determining improvements needed for future funding

48 ESRI s ModelBuilder Program Allows for Automation of Risk Assessment ModelBuilder is a workflow application model It s used within the GIS environment to manage and evaluate system assets Model automates all scoring and weighting calculations based on criteria

49 Performance Probability of Failure Scoring Looked at a Range of Structural and Functional Issues Component Component Criteria Scoring Options Capacity Regulatory O&M Obsolescence Flow Limitations 1, 2, 3, 4, 5 Overtopping of Roadway 1, 3, 5 Design Storm 1, 3, 5 Current 1, 5 Future 1, 3, 5 Field Maintenance 1, 3, 5 Maintenance Time 1, 3, 5 Useful Life 1, 2, 3, 4, 5 Technology 1, 2, 3, 4, 5

50 Consequence of Failure Scoring Used Prorated Values Based on a TBL Analysis Components and Weighting Environmental - 30% Social - 40% Economic - 30% Component Criteria Criteria Weighting Max Score System Flows to Impaired Water 5% 0.25 Distance to Stream 5% 0.25 Regulatory Violation 15% 0.75 Environmental Cleanup Cost 5% 0.25 Disruption of Service 10% 0.50 Critical Facility Impact 12% 0.60 Public Image 6% 0.30 Safety 12% 0.60 Pipe Location 5% 0.25 Rehab\Replacement Cost 15% 0.75 Operational Losses 5% 0.25 Additional Contractor Services 5% 0.25

51 ModelBuilder Program Simplifies and Visualizes CIP Development Process Approx. 156 functions are performed in the model Some functions contain embedded scripts to perform complex calculations Average runtime <5 minutes Model was used to score and rank 440 total projects

52 ModelBuilder Also Allows for Easy Tabular Prioritization of Assets TOTALSCORE PROJECTID On Street From Street To Street District(s) PIEDMONT AVENUE MARTIN LUTHER KING JR DR DOWNTOWN CONNECTOR WHEELER STREET JOSEPH E LOWERY BLVD JAMES P BRAWLEY DR HOLLYWOOD ROAD DONALD LEE HOLLOWELL PARKWAY JOHNSON RD PRYOR STREET BROTHERTON ST PARK PLACE CASCADE AVENUE BEECHER ST RALPH DAVID ABERNATHY BLVD CAMPBELLTON ROAD KENILWORTH DR OAKLAND DR ELLIS STREET PEACHTREE ST PIEDMONT AVE CAPITOL SQUARE MITCHELL ST MITCHELL ST CENTENNIAL OLYMPIC PARK DRIVE MARIETTA ST SPRING ST HARRIS STREET CENTENNIAL OLYMPIC PARK DR PIEDMONT AVE CAPITOL AVENUE FULTON ST NORTH END HANK AARON DRIVE UNIVERSITY AVE CAPITOL AVE SPRING STREET WHITEHALL ST IVAN ALLEN JR BLVD SOUTHSIDE INDUSTRIAL PARKWAY RUBY H HARPER BLVD SE JONESBORO RD LAKEWOOD WAY PRYOR RD LAKEWOOD AVE MARIETTA STREET PEACHTREE ST IVAN ALLEN JR BLVD LAKEWOOD WAY LAKEWOOD WAY PRYOR RD 1, , 2, 4 4, 10 4, 12 2, 5 4 2, 4 2, 4, 5 1, 4 1, 12 2, , 4 12

53 The Benefits of Risk-Based Stormwater Asset Management Switch from Reactive to Proactive Holistic, Data Driven Evaluation of Stormwater Assets Takes Bias Out of Capital Planning Positions You for Future Regulatory Compliance Using TBL Analysis

54 THANK YOU! Mark VanAuken, PE, CMS4S, ENV SP Stormwater/MS4 Discipline Leader