Douglas County Pavement Management Douglas County Public Works - - PowerPoint PPT Presentation

June 2013 Douglas County Public Works 1

Douglas County Pavement Management

Douglas County Public Works June 26, 2013

June 2013 Douglas County Public Works 2

Overview

 Pavement Management Concepts  Pavement Condition Index (PCI)  Overall Paved Network Condition  Budget Scenarios

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What is Pavement Management?

 An objective process for:

 Making the most effective use of available

funding

 Understanding the consequences of alternate

strategies

 Quantifying the value of pavement assets  Determining your pavement-related needs  Communicating with decision makers

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Levels of Pavement Management

Network-Level Program-Level Project-Level

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Network-Level Management



Planning



Budgeting



Estimating Pavement Needs



Setting Goals



Measuring Performance



Identifying Trends

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Program-Level Management



Developing Lists of candidate projects



Analyzing the impact of changing projects or treatments

• n overall condition



Maintaining a list of backlog projects

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Project-Level Management



Determining the cause(s) of a premature failure



Gathering data for pavement design



Designing pavements



Evaluating materials, specifications, construction techniques



Measuring impact of traffic, climate, materials



Research

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Pavement Management Philosophy

20 40 60 80 100 5 10 15 20

AGE PAVEMENT CONDITION

Cost-Effective Time for Preventive Maintenance Cost-Effective Time for Rehabilitation Costly Time for Rehabilitation

• r Reconstruction

Failed Serious Very Poor Poor Fair Satisfactory Good

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Douglas County Road Mileage

Douglas County, 231.05 GID's, 138.19 Private & HOA's, 106.05 Towns, 39.98 NDOT, 101.85 Not Accepted for Maintenance, 177.05

Paved – 171 miles Grindings – 43 miles Gravel – 17 miles

Total Miles ~795

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Pavement Inventory

 171 miles (paved)  465 pavement sections  Network Level Inspection  Sampling Method (1,365 S.U. inspected)

Total No. Sample Units

• No. Sample Units to

Inspect 1 to 5 1 6 to 11 2 11 to 15 3 16 to 40 4

• ver 40

10%

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PCI Inspection

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Visual Example of PCI Scale

PCI = 98, Jacks Valley Road

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Visual Example of PCI Scale

PCI = 60, Hermosa Court

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Visual Example of PCI Scale

PCI = 9, Waterloo Lane

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Pavement Condition Results (2010)

Failed 2% Serious 6% Very Poor 9% Poor 19% Fair 23% Satisfactory 24% Good 17%

Network Area-Weighted PCI in 2010 = 62 (Fair)

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PCI vs. Repair Type

PCI Repair Type

81-100 Preventive Maintenance 66-80 51-65 Major Rehabilitation 41-50 0-40 Reconstruction

$ $$$$

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Development of a Pavement Program

 Assess current and projected future conditions

throughout the pavement network.

 Develop a plan to address



Failed roads



Preservation needs



Long-term rehabilitation needs

Pavement Maintenance Strategies



Routine/Localized Maintenance Strategies



Crack Filling



Patching



Shoulder Grading



Preventive/Corrective Maintenance Strategies



Chip Seals



Slurry Seals



Thin Overlays



Rehabilitation and Reconstruction



Thick Overlays



Reconstruction

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Pavement Condition Index

Adopted PCI Goal = 70 Adopted Priority Matrix

PCI Arterial Collector Local Budget Category 86-100 4 5 6 Routine Maintenance 0.0% 5.2% 11.9% 56-85 1 2 3 Preventative Maintenance 0.7% 21.2% 25.3% 0-55 7 8 9 Major M&R 0.0% 12.3% 23.4% 1 = Highest Priority, 9 = Lowest Priority % Network Pavement Area

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Budget Analysis

Budget Summary

Adopted PCI Goal = 70

Budget Scenario Annual Budget Network Area- Weighted PCI in 2022 Condition Category Backlog in 2022 Current Funding $ 1,800,000 54 Poor $51 M Maintain PCI $ 4,800,000 58 Fair $42 M PCI 70 $ 6,100,000 70 Satisfactory/Fair $22 M No Backlog $ 7,700,000 77 Satisfactory $0 M

Backlog, or deferred maintenance, is the estimated cost to rehabilitate pavements with a PCI < 55. This is work that is needed but not funded.

Budget Allocation Example

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Budget Allocation Stop Gap and Routine/Localized Maintenance Global & Preventive/Preventive M&R Major M&R Total Network Area- Weighted PCI in 2022 Backlog in 2022 Current $ 700,000 $ 375,000 $ 725,000 $ 1,800,000 54 $51 M Maintain PCI $ 1,250,000 $ 2,750,000 $ 815,000 $ 4,815,000 58 $42 M PCI 70 $ 1,000,000 $ 2,800,000 $ 2,280,000 $ 6,080,000 70 $22 M Notes:

• 1. Allocation between budget categories changes from year to year.
• 2. Analysis is sensitive to allocation of funding among work types.
• 3. Need to continue with inspections and update database, policies, budgets, etc. (feedback).

Funding Comparison

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Agency Miles Maintained Approximate Annual Preventive Maintenance Funding (not including routine maintenance) Total Per Mile Paved/ Chip Seal Grindings Gravel/Dirt Total Douglas County 171 43 17 231 $300,000 to $350,000 $1,515 Lyon County 285 10 248 543 $1,400,000 to $1,800,000 $3,315 Town of Minden 14.5 14.5 $300,000 to $500,000 $34,482 Town of Gardnerville 20 20 $300,000 to $500,000 $25,000 Gardnerville Ranchos GID 43 43 $500,000 to $900,000 $20,930 Kingsbury GID 22 22 $600,000 to $750,000 $34,090 Round Hill GID 4.4 4.4 $200,000 to $250,000 $56,818

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?

June 2013 Douglas County Public Works 26 Year 0 Year 3 Year 6 Year 10 Year 20

Ideal Road Maintenance Program Equivalent Annual Cost = $24,314.50 per mile of paved road

Overlay $175,000/mile At 20 Years Reconstruct Road $750,000/mile at 40 Years Day One of Road Surface Seal $50,000/mile Every 10 Years Oil Road Every Three Years $10,000/mile

Extended "Maintenance" Life = 40 years Service Life = 20 years

$6,480/Mile of Road for Routine Annual Maintenance

Excludes Equipment Replacement Costs

211 miles of paved/gringings roads = $5,130,360 / year budget required

$6,480/Mile of Road for Routine Annual Maintenance Oil Road Every Three Years $10,000/mile Surface Seal $50,000/mile Every 10 Years

Assumes Roads are in New Condition at Day One

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PCI Rating Scale

PCI Rating

85-100 Good 70-85 Satisfactory 55-70 Fair 40-55 Poor 25-40 Very Poor 10-25 Serious 0-10 Failed

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Pavement Condition Results

10 20 30 40 50 60 70 80

Area-Weighted PCI County Area

Wt Avg Condition 69 74 53 51 52 29 71 Foot John MnGv NC Ranc SC Taho Network Area-Weighted PCI = 62 (Fair)

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Pavement Management System

 System to collect pavement condition data  Database to store and sort collected data  Analysis program to evaluate repair and

preservation strategies and cost effectiveness

 Evaluate budget consequences  Evaluate “what if” questions  Micro PAVER

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Why Micro-Paver?



Developed by the Army Corps in the late 70’s



Recommended by APWA (American Public Works Association)



Optimizes funds allocated for M&R



Utilizes the Pavement Condition Index (PCI) methodology



PCI became and ASTM standard in 1999

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Road Maintenance Zones

1. Lake Tahoe 2. North County 3. Foothill 4. Johnson Lane 5. Minden/Gardnerville 6. Ranchos 7. South County

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Example Sample Unit Layout

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County Maintained Roads by Zone

5 10 15 20 25 30 35

Percent of Total Pavement Area County Area

Pct Area 13 32 29 9 12 2 2 Foot John MnGv NC Ranc SC Taho

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Pavement Condition Index (PCI)

 Visual Condition Survey

 20 Distress Types (AC)  Severity Level  Quantity

 U.S. Army Corps of Engineers  ASTM Standard D6433  Adopted by American Public Works

Association

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Pavement Inventory

 171 miles (paved)  465 pavement sections  Network Level Inspection  Sampling Method (1,365 S.U. inspected)

Total No. Sample Units

• No. Sample Units to

Inspect 1 to 5 1 6 to 11 2 11 to 15 3 16 to 40 4

• ver 40

10%