A Comprehensive Approach to Storm Water Asset Management Planning. City of Virginia Beach Public Works Operations

Transcription

1 A Comprehensive Approach to Storm Water Asset Management Planning City of Virginia Beach Public Works Operations Steve McLaughlin, PE April 2016

2 Agenda

3 City of Virginia Beach, VA Population: 450, Square Miles 1,200 miles Pipe 5,000 outfalls (1/2 to Chesapeake Bay) 160 miles Off Road Ditches 450 miles Roadside Ditches 15 Pump Stations 776 Lakes to inspect; 491 Lakes to maintain 58 Dams/Spillways

4 FY17 Proposed Revenue ERU Daily Fee = $0.433 ERU Annual Fee = $ ERU s (FY 17) = 248,723 SWU Generates $39,417,213 Annually ERU = Equivalent Residential Unit Stormwater Fee, $39,417,213 Other, $442,470

5 Storm Water Debt Debt Amount Interest Rate 2010B Storm Water Revenue Refunding Bonds 2010A Storm Water Revenue Bonds 2015 Storm Water Revenue Bonds Debt Service Payments (FY17) $ 4,530, % $641,581 $17,295, % $1,391,695 $22,270, % $1,359,106 Total $44,095,000 $3,392,383

6 Storm Water FY Funding Flood Control $29.5 M 22% Water Quality $18.1 M 13% Operations & Maintenance $88.6 M 65%

7 Storm Water FY Requested Program O&M Project CIP FY Total Budget SW Infrastructure Rehabilitation & Improvements II 56,172,866 34,300, Residential Drainage Cost Participation Program II 450, , Primary System Infrastructure Improvements II 17,430,000 13,620, Oceanfront Storm Water Facilities Maintenance 5,708,000 4,500, Stormwater Pump Station Modifications 7,416,889 5,000, Lake Management II 47,031,404 29,985, Stormwater Operations Modular Building 890, , Severe Repetitive Loss Grant Program 1,847, Flood Mitigation Assistance Grant Program 1,227,144 0 Report Total 138,173,312 88,105,912 GovMax V5 1/12/2016

8 Program Background

9 Storm Water CIP Section O&M SW Infrastructure Rehabilitation & Improvements II Neighborhood Pipe Rehabilitation Accomplishments: Neighborhood Constr. Cost Phase Princess Anne Plaza FY13 $5.5M Complete Aragona FY14 $2.8M Complete Green Run FY15/16 $2.8M Complete Glenwood FY16 $1.8M Construction Pine Ridge/Hunt Club/Middle Oaks/Strawbridge FY17 $1.1M Construction Kings Grant FY17 $2M Design Total: $16M Upcoming Neighborhood Pipe Rehabilitation Projects: Neighborhood Constr. Cost Est. Magic Hollow FY17 $2M 1970s Fairfield FY18 $2M 1970s Southgate FY18 $1M 1980s Ocean Lakes FY19 $2M 1980s Windsor Woods FY19 $2M 1960s Indian Lakes FY20 $2M 1970s Salem Woods FY20 $2M 1980s Salem Lakes FY21 $1M 1980s Red Mill Farms FY21 $2M 1980s Lagomar FY21 $1M 1980s Malibu FY22 $1M 1960s Foxfire FY22 $1M 1990s Courthouse Estates FY22 $2M 1990s

10 7-416 SW Infrastructure Rehabilitation & Improvements II - $5.5M Current/Completed Major Neighborhood Rehabs: Neighborhood Constr. Cost Phase Princess Anne Plaza FY13 $5.5M Complete Aragona FY14 $2.8M Complete Green Run FY15/16 $2.8M Complete Glenwood FY16 $1.8M Construction Pine Ridge/Hunt Club/ Middle Oaks/Strawbridge FY17 $1.1M Construction Kings Grant FY17 $2.0M Design Magic Hollow FY17 $2.0M CCTV Total: $18M Green Run Pipe Lining Green Run Pole Grouting

11 Program Overview 1. Methodology Goals 4. Apply 2. Implement 3. Results

12 Probability of Failure Methodology RISK BASED Consequence of Failure

13 Methodology Prioritization Score Factors Cave-In Notification Methods Other Projects City Staff Citizens

14 Methodology Prioritization Score Factors Above Ground Defect Codes Defect Correlation Pavement Condition Structure Interface Surface Condition

15 Methodology Prioritization Score Factors Roadway Type Roadway Type Geographic Pipe Material Risk Modifiers Pipe Size

16 Methodology Risk Modifiers Descriptor Modifier Risk Modifier Roadway Geographical Pipe Diameter Pipe Material Arterial Collector Local Tidal Influence School Park Sidewalk < >48 RCP CMP CHDPE

17 Methodology Prioritization Threshold Defect Grade Variable Grade Modifier Modifier Effective Grade Risk Modifier Descriptor Modifier Risk Modifier Roadway Geographical Pipe Diameter Pipe Material Arterial Collector Local Tidal Influence School Park Sidewalk None < >48 RCP CMP CHDPE MINIMUM TOTAL RISK MODIFIER Prioritization Threshold, 2,700 = (Min. Grade 5 Effective Grade, 450) x ( Risk Modifiers, 6)

18 Methodology Quantitative Risk Analysis Methodology Risk Threshold Improvement Prioritization

19 Implementation Green Run 100,000 LFT Glenwood 105,000 LFT Pine Ridge 40,000 LFT

20 Implementation Above Ground Defect Codes Field 2-Person Crew Document Defects Immediate Concerns Daily Record

21 Implementation Cave-in Failure Factors Office - CCTV Reviewers In-House Review Software Document Defects Preliminary Repair Methods

22 Implementation

23 Implementation Risk Modifiers Office/Field GIS Data Field Observation Institutional Knowledge Preliminary Repair Methods

24 Implementation Cured in Place Pipe Hole Lift hole with deterioration Broken Existing Point repair Poor Condition Grout Joint Offset/Separation Moderate to Severe Roots Deposits Settled Fine Deposits Ingress No Rehab Minor Roots Infiltration Existing Point repair Good Condition

25 Results by Rehabilitation Method ALL 3 BASINS Type Total Number of Assets Total Length (FT) Grouting ,591 Segmental Lining ,404 Full Length CIPP Lining ,349 Segment Costs 75% of CIPP (Lining Cost) Full Length CIPP (Lining)

26 Probability of Failure Results Of Assets By Basin Consequence of Failure

27 Results Summary All 3 Basins

28 What s Happening Now? Rehabilitation Glenwood 29,693 LFT At Construction Rehabilitation Pine Ridge 10,297 LFT At Construction Condition Assessment Kings Grant 37,000 LFT At Design

29 Benefits Of Program Reduce Cave-ins and Improve Safety Extend Useful Life of Assets Defendable, Analytical Approach Efficient Use of Capital Funding to Stretch Public Funding

30 THANK YOU QUESTIONS? Steve McLaughlin, PE City of Virginia Beach Public Works Stormwater Operations Manager

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