Sustainable Road Drainage Asset Management Strategy and Financial Requirements
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1 Sustainable Road Drainage Asset Management Strategy and Financial Requirements Liane Welch, P.E., Director, Tillamook County Public Works Patricia Bugas-Schramm, PBS Consulting Jeff Roorda, P.E., JRA TRB TAM Conference San Diego, CA April 17, 2012
2 Tillamook County, Oregon
3 Largest source of harvestable timber in state 64% publicly owned land 50% increase in summer population
4 Climate = Wet - 90 inches average rainfall - 5 rivers empty into Tillamook Bay Recent severe weather events: November year flood December year wind event January year snow event December 2007 hurricane-force winds & flood Winter floods Winter 2011 Flood Winter Flood Weather prediction More of the same Frequency and magnitude of coastal flooding events may continue to increase. Oregon Climate Change Research Institute Report, November 30, 2010
5 Drainage is the key to community safety Neskowin Trace Winter Storm 2011 Bixby Road Winter Storm 2006 Fawcett Creek Road
6 Goal An accessible, safe and well maintained county road network clear of surface storm water and flooding. Strategic Objectives provide and maintain adequate road drainage in order to prevent water damage to the roadway structure, maximize the use of the county road network, protect the rights of adjoining property, and provide fish passage where mandated.
7 Purpose maintaining vegetated ditches that serve as drainage and water quality facilities, maintaining culverts in the condition necessary to handle their design capacity, and where culverts carry streams, in maintaining them in a condition to provide fish passage. County Activities Culvert and catch basin cleaning Culvert replacement Ditching Erosion control using best management practices with regards to steep slopes, drainage ways and permitted activities.
8
9 Do you know the history of your system?
10 Fawcett Creek Road
11
12 Fawcett Creek 2008 Flood
13 Fawcett Creek Today
14 20% of Service Requests are drainage related Risk incidents increasing Asset condition unknown Catastrophic Failures more frequent Pothole Repair 56% Other 9% Drainage 11% Vegetation Management 9% Traffic Safety 9% Surface Bladiing 3%
15 Which assets are most Critical? Risk = Likelihood x Consequence of Risk Consequence 1 Insignificant 2 Minor 3 Moderate 4 Major 5 Catastrophic Likelihood 5 Almost Certain M H H E E 4 Likely M M H H E 3 Moderate L M H H H 2 Unlikely L L M M H 1 Rare L L M M H
16 Culverts Extreme risk Ditches Extreme risk Vegetation Management Extreme risk 5 x 6 Drainage Culverts Outdated inventory & condition assessment Lack of mapped culverts Low lying roads inundated by plugged or deteriorated culverts Inappropriately sized outfalls beavers, undersized culverts, storm water, age road washouts, flood property, road closures, traffic delays, property damage, emergency response issues, ecological impacts, negative impact on road integrity, public safety, may leave citizens isolated Threat 5 5 Probability Mitigate partner to funds culvert replacements, inventory and map assets, inspect prestorm, rate condition Develop preventive maintenance program Impact 5 x 4 7 Drainage Ditches and Shoulders Lack of maintenance, sediment from floods, debris from mowing, tree canopy, Eliminated program over 20 years ago, vegetation up to road saturated road bed, flooded roads, soft and eroded shoulders, culverts plug, citizen complaints, Threat 5 4 Probability Accept & Mitigate inventory and map assets, inspect, rate condition Develop preventive maintenance program Impact
17 Drainage Risk Management Strategy: Mitigate Risk Partner to fund culvert replacements Inspect prestorm, rate condition Develop drainage asset management plan Improve inventory and remaining life assumptions Partner with TEP to conduct partial inventory, condition assessment & map assets Improve replacement cost estimates using County costs Develop low confidence future performance estimates Identify any funding gap Sustained performance over asset live (Desired) Current Service Level If further cuts to revenues Communicate drainage performance tradeoffs 17
18 Targeting Drainage Service Failure No link between service plan & long range financial plan Lack of knowledge about culvert condition Inadequate engineering design Lack of County storm water management plan
19 Rated 20% of inventory in (Critical)-5 (Very Good) Condition Scale Inspected 20% of culverts in % inventory in IRIS with location & dimensions Data Confidence: Low-Moderate
20 3,300culverts $281M current replacement value Low-Moderate confidence in information
21 Track Known Risks in Register Road Milepost Current Condition Material Type Diameter (in) Culverts Length (ft.) Culverts Cover Depth (ft.) System Type Desciption - Name FAIRVIEW RD CS - Corrugated Steel Cross Culvert - C Ditch - D FAIRVIEW RD CS - Corrugated Steel Approach Culvert - ADitch - D HUGHEY LN CS - Corrugated Steel Cross Culvert - C Ditch - D MIAMI-FOLEY RD PC - Precast Concrete Cross Culvert - C Ditch - D SOUTH PRAIRIE RD PC - Precast Concrete Approach Culvert - ADitch - D SOUTH PRAIRIE RD O - Other Frontage - F Ditch - D SOUTH PRAIRIE RD CA - Corrugated Aluminum Approach Culvert - ADitch - D TRASK RIVER RD CS - Corrugated Steel Cross Culvert - C Ditch - D TRASK RIVER RD PC - Precast Concrete Cross Culvert - C Ditch - D TRASK RIVER RD PC - Precast Concrete Cross Culvert - C Ditch - D Carried Type Desciption - Name TRASK RIVER RD CS - Corrugated Steel Cross Culvert - C Named Body - B BLAINE RD - UPPER NESTUCCA RD CS - Corrugated Steel Cross Culvert - C Stream - S MIAMI-FOLEY RD PC - Precast Concrete Cross Culvert - C Stream - S MIAMI-FOLEY RD PC - Precast Concrete Cross Culvert - C Stream - S MIAMI-FOLEY RD PC - Precast Concrete Cross Culvert - C Stream - S MIAMI-FOLEY RD CS - Corrugated Steel Cross Culvert - C Stream - S MIAMI-FOLEY RD CS - Corrugated Steel Cross Culvert - C Stream - S TRASK RIVER RD PC - Precast Concrete Cross Culvert - C Stream - S TRASK RIVER RD CS - Corrugated Steel Cross Culvert - C Stream - S TRASK RIVER RD CS - Corrugated Steel Cross Culvert - C Stream - S TRASK RIVER RD CS - Corrugated Steel Cross Culvert - C Stream - S TRASK RIVER RD CS - Corrugated Steel Cross Culvert - C Stream - S
22 Action - Rank Critical Deficiencies based on Benefit-Cost Cost Remaining useful life/condition/performance Fish passage Alternate route out of community Lifeline route Emergency route Functional classification and use of route (arterial-collector, or local road) Detour length Consequence of failure on property Partner funding Value-Added Criteria Access & Safety Criteria Strategic Priorities TOTAL Asset Detour Lifeline Alternate Emergenc Fish Functional Consequence Partner BENEFIT WEIGHTED COST/ PROJECT Culvert Replacement Projects Condition Cost Length Asset Route y Route Passage Classification to Property Funding? SCORE BENEFITS BENEFIT RANK 1 Cape Lookout Road Culvert 5 $ Bixby Road 5 $ Miami River Road 5 $ Hobsonville Point Road Culvert 5 $ Sandlake Road - Reneke Creek 5 $ Trask River Road 5 $ North Fork Road 5 $ Sandlake Road - Jewel Creek 5 $
23 Resourcing Crisis becomes Elimination of Federal funds July 1, 2012 Slight increase in State gas tax No Local property tax support $2,000,000 $1,500,000 $1,000,000 $500,000 $0 Federal Forest Fees We are here Fiscal Year Road Department 2011 Revenues 23
24 Discussion on Service Level Resourcing Options Culvert Funding Shortfall over 10 Years is $25 million Need Current funding level
25 Service Levels Quality/Condition 100% Condition Today Condition in 10 Years with No Additional funding 90% 80% 70% 60% 50% 40% 30% Very Good Good Fair Poor Very Poor 20% 10% 0%
26 10-Year Service Costs Declining Service Level (in 000 s)
27 Alternative Service Level: Mix of Fixes Eliminate Very Poor & Known Deficiencies Replace 2% per year Assess 20% condition annually build knowledge Projected Operating & Capital Expenditures
28 Drainage Service Performance Indicators Indicator Description Target* Result Status Projected 10- Year needs vs. Estimated Budget Asset Sustainability Balanced Projected Needs to Operating Budget Renew culverts at rate of depreciation 100% 16% % 9.5% Asset Consumption Ratio Culverts in Fair or Better condition >70%-<80% 62% * Draft Culverts in Poor or Failed condition <30% 32%
29 Drainage Service Performance Indicators Indicator Description Target* Result Status Systems & Processes Retain Employees & Staffing Level Legal compliance - culverts on streams (ESH) Report Drainage Risks in Register 100% of FY 2012 Level (19) 90% 100% 68% 100% 20% Service Delivery Service Requests responded to in 24 hours * Draft >95% 70%
30 Communicate Tradeoffs Service levels expected to decline over next 10 years with current funds Risks include flooding, long detours & higher future costs Still need integrated County services resourcing strategy
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