La Plata County Presentation 2017 rev3 - Revize works/engineering... · La Plata Annual Funding...
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2017 State of the Roadway Network in La Plata County Zac Thomason, M.B.A., National Client Services Manager IMS Infrastructure Management Services
Transcript of La Plata County Presentation 2017 rev3 - Revize works/engineering... · La Plata Annual Funding...
2017 State of the RoadwayNetwork in La Plata County
Zac Thomason, M.B.A., National Client Services ManagerIMS Infrastructure Management Services
Scale of Investment….Scale of Investment….
Early look at the condition score:PCI = 66 (Good)
Back log = 6% (target 12%)
Early look at the condition score:PCI = 66 (Good)
Back log = 6% (target 12%)
Single largest visible County asset valued at $892K/mile or $198.1M total plus
improvements and ROW(not including the value of land, bridges, etc.)
Single largest visible County asset valued at $892K/mile or $198.1M total plus
improvements and ROW(not including the value of land, bridges, etc.)
~54,688 people~221.9 CL miles of City owned roadways
3.5M square yards of pavement
~54,688 people~221.9 CL miles of City owned roadways
3.5M square yards of pavement
Why do Pavement Management?….Why do Pavement Management?….
Time
Pave
men
t Qua
lity
has a 15% drop in quality
15% of pavement life
$1 spent now
Costs $8 if delayed
Very Good
Good
Very Poor
Poor
Excellent
Fair
40% of pavement life
has a 40% drop in quality
Time
Pave
men
t Qua
lity
Target Zone for Pavement Rehabilitation
Pavement Life Cycle Curve
Increased Pavement Life
A pavement management system is a set of tools or methods that assist decision makers in finding optimum strategies for providing and
maintaining pavements in a serviceable condition over a given time period
Concept of Pavement Management...Concept of Pavement Management...
CountyObjectives,
Policies & Budgets
CountyObjectives,
Policies & Budgets
Priorities, Analysis Techniques
& Reporting
Priorities, Analysis Techniques
& Reporting
BalancedApproachBalancedApproach
Understanding ofCondition
Understanding ofCondition
Tools to Rate the Streets – Objective Surveys….Tools to Rate the Streets – Objective Surveys….
Condition Focuses On:Roughness
Wheel Path RuttingAlligator Cracking
Longitudinal & Transverse CrackingDistortionsBleeding
Weathering/RavelingPatching & Potholes
Subsurface Condition focuses on:Structural adequacy – pavement strength
Ability to withstand design loading – traffic
Understanding the Pavement Condition Index….Understanding the Pavement Condition Index….
Understanding the PCI….Very Poor (0 – 25)Understanding the PCI….Very Poor (0 – 25)
La Plata Has No Very Poor Roads
Base &/or Structural FailuresRutting
Excessive Cracking
Past point of overlay based rehabilitation and/or panel
replacements.Rehabs often driven by citizen
complaints.
Safety becomes a concern at very low PCI.
Understanding the PCI….Poor to Marginal (25 – 50)Understanding the PCI….Poor to Marginal (25 – 50)
Localized base failuresRutting at intersections
Extensive crackingExtensive patching
Tired streets due for athicker overlay, possibly a surface removal
and replacement.
High priority to avoid reconstruction
Understanding the PCI….Fair (50 – 60)Understanding the PCI….Fair (50 – 60)
Progressive crackingFew base failures
Localized distresses
Optimum timing for thin – moderate overlay.
Many benefits to selecting these streets: early lower cost – greater
return, less grinding, drainage
Understanding the PCI….Good (60 - 70)Understanding the PCI….Good (60 - 70)
Few localized distressesMinimal base failures
If distressed due to loading, may need thin overlay, otherwise crack seal and surface treat
(micro/chip seal/slurry).
Greatest cost benefit:Thinner strategies
Less crown build-upLess intrusive rehab
Maintain existing drainage
Understanding the PCI….Very Good (70 - 85)Understanding the PCI….Very Good (70 - 85)
Very few distressesNo rutting
No base failures
Crack seal with surface treatment.
Maintains existing drainage.Extends pavement life at lowest
cost
Understanding the PCI….Excellent (85 - 100)Understanding the PCI….Excellent (85 - 100)
Like new conditionVery few minor distresses
Smooth ride, good drainage
Should provide 5 to 10 years prior to first rehabilitation with routine maintenance
La Plata PCI Results for 2017….La Plata PCI Results for 2017….
Typical Distribution
La Plata Results…. 3 metrics of healthLa Plata Results…. 3 metrics of health
Backlog ≈ 6%Target 12%
Below the minimum 15%
Nationwide Avg 60 - 65
La Plata County – Structural CharacteristicsLa Plata County – Structural Characteristics
Of streets tested, only a handful represent
understrength overlays
Streets in good structural condition
La Plata Pavement Results….La Plata Pavement Results….
Suggest a minimum target PCI of Backlog of reconstruction ≤ 10%
Average Network PCI = 66Backlog of reconstruction = 6%
County of La Plata Methodology….County of La Plata Methodology….
1. Funding is not $0, nor is it unlimited
2. La Plata places a value on its roadway network
Arterials – Collectors – Locals
3. Identify annual budget to maintain current PCI & Backlog
4. Examine effects of current funding levels
5. Prevent deterioration in pavement quality
6. Pavement management is priority based, not worst-first
7. ADA compliance not included
8. No cost inflation
La Plata Annual Funding Estimates….La Plata Annual Funding Estimates….
La Plata Annual Funding Estimates….La Plata Annual Funding Estimates….
Typical life cycle estimates show that La Plata would need approximately $3.7M to $5M annually to maintain the existing
network average PCI(does not include routine maintenance activities, ADA compliance, culverts or ditch
repair, signage, striping, bike lanes, or additional width)
Typical life cycle estimates show that La Plata would need approximately $3.7M to $5M annually to maintain the existing
network average PCI(does not include routine maintenance activities, ADA compliance, culverts or ditch
repair, signage, striping, bike lanes, or additional width)
Post Rehab PCI & Annual Funding….Post Rehab PCI & Annual Funding….
5 Year PCI Budget Analysis….5 Year PCI Budget Analysis….
Post Rehab Backlog & Annual Funding….Post Rehab Backlog & Annual Funding….
Cost of Equity Removal….Cost of Equity Removal….
Long term underfunding of rehabilitation and maintenance is the direct equivalent of removing equity from an asset – eventually it must be repaid
through total reconstruction.
Set Priorities and Operating Parameters…. Set Priorities and Operating Parameters….
La Plata Rehabilitation Needs….La Plata Rehabilitation Needs….
Streets with high PCI scores do not always
reflect great structural strength
Arterials have the highest priorityFollowed by collectors then locals
Order of rehab selection to be based on the cost of deferral.
For example:if a street requiring a thick olay is deferred, the incremental cost is about 100%, but if a street
slips from a thin to a moderate olay, the penalty is only about a 25% increase.
La Plata Annual Funding Comparison….La Plata Annual Funding Comparison….
Good PCI, Excellent Backlog, Funding a Concern
County of La Plata Recommendations….County of La Plata Recommendations….
1. Maintain PCI at or above 66 with a backlog below 10% for entire roadway
network.
The recommended budget of $4.58M would result in a network PCI of 68 and backlog
at 8% over the next 5 years.
The steady state PCI budget of $3.77M would result in a network PCI of 66 and backlog
at 10% over the next 5 years.
2. Use of a full suite of rehabilitation strategies reviewed on an annual basis.
3. Steady – effective rehabilitation and maintenance on an annual basis saves
the County money over deferred maintenance.
4. County should resurvey their streets every few years to update the
condition data, analysis models, and rehab program.
Questions?….Questions?….
