Oregon Dept. of Transportation Culvert Condition Assessment & Inventory

1. Oregon Dept. of TransportationCulvert Condition Assessment & Inventory Presented By: Paul R. Wirfs, P.E. Deputy Manger of Geo-Env Section Developed By: Robert E. Trevis, P.E. Culvert Engineering Program Lead

2. Outline • Program Overview • Challenges • Culvert Handbook • Data Collection • Inventory Fields • Condition Assessments • Culvert Data – Making Sense of the data • Drainage Facility Management System

3. Program Overview Oregon DOT’s Culvert Inventory and Condition Assessment: • Culverts spans between 12 inches up to 20 feeton State Highways. • 40 % of the State’s highway system completed. • Equates to over 15,000 culverts • Over 25% of these are in Poor or Critical condition. Benefits of completing a culvert inventory and condition assessment include: • Reduced risk of sudden failure. • Improved project prioritization of culvert projects. • Reduced culvert infrastructure repair cost ( vs. emergency response)

4. 2016 Culvert Update

5. Challenges • Safety • High traffic volumes • Accessibility • High water levels • Terrain • Vegetation

6. Culvert Inspection & Inventory Handbook Developed to: • Provide a quick reference guide for qualified employees who have successfully completed the core training requirements. • Ensure repeatable results • Provide program wide uniformity and consistency. • Support a statewide program for inventory and determining the condition of culverts.

7. Inventory Fields Inventory fields are only collected once on the initial site visit. Location Collected Inventory Information: Drainage Facility ID Bridge ID Number Stream Name Orientation Skew Inlet Side Facility Usage Height of Cover End Treatment Embankment Protection Material Span Rise Length Shape Material Facility Width Comment Field

8. DFMS Condition Assessment

9. * Condition Module Condition Ratings Ratings are based on a scale from 1 to 4. Only use ‘0’ when unable to rate a particular condition rating. The ODOT “Culvert Inspection & Inventory Handbook ” lists the rating criteria text and photographs of each condition assessment field.

10. Condition Assessment Roadway: Roadway Sag/ Guardrail Dip Embankment Popouts / Voids Pavement Cracks / Patches Hydraulics: Channel Alignment Embankment Protection Inlet Scour Inlet Embankment Protection Outlet Scour Outlet Structure: General Barrel Condition Piping Damage Drift Invert Condition Settlement Vegetation Obstruction Out of Round Open Joints End Treatment Condition Cracking Strc Blockage

11. Roadway Assessment Embankment Pop Outs / Voids: Rate the roadway embankment slope for signs of failure and infiltration of fill into the culvert. Observations to Rate: • Soil cracks along the contour of the slope • Depressions and slumps • Voids along the shoulder or embankment

12. Hydraulic Assessment Embankment Protection: Rate the condition of the embankment protection placed on the slope at the culvert inlet and outlet. Observations to Rate: • Erosion around the culvert inlet and outlet of the roadway embankment • Stability of embankment protection • Loss of embankment protection • Scour or undermining of embankment protection

13. Structure Assessment Cracking - Concrete: Rate circular concrete culverts and reinforced concrete boxes for any cracking. Observations to Rate: • Cracking of concrete • Spalling of concrete • Exposed rebar.

14. Structure Assessment Cracking - Metal: Rate multi-plate culverts for cracking around the bolt holes and plate seams. Observations to Rate: • Cracking at bolt holes • Cracking along the plate seams • Deterioration of the metal around the bolts or plate seams

15. Structure Assessment General Barrel Condition - Metal: Rate the general overall condition of the culvert. Observations to Rate: • Corrosion of metal • Cracking along bolt holes or plate seams • Distortion or ‘Out of Round’ • Holes or section loss of material • Buckling of culvert material • Infiltration of material • Open or separated seams Important Note: General Barrel Condition rating must be equal to or lower than the lowest rating in the Structure section. ‘Drift’ ‘Vegetation’ and ‘End Treatment’ are not used in this determination.

16. Structure Assessment Invert Condition: Rate the condition of culvert invert and sides. Observations to Rate: • Metal • Severity of corrosion • Holes in the invert or sides • Section loss of material • Concrete • Spalls • Abrasion • Exposed Rebar • Plastic • Holes in the invert or sides

17. Structure Assessment Open Joints: Rate the separation of the connection between pipe sections and seams. Observations to Rate: • Any separation between pipe sections • Any separation of the seams between plates • Voids in fill material visible through pipe separation • Infiltration of backfill material

18. Structure Assessment Out of Round - Concrete: Rate the geometry of the cross sectional area of the culvert. Observations to Rate: • Distortion of the culvert • Flattening of the invert • Flattening of the crown

19. Making Sense of the Data

20. Making Sense of the Data Analytic Hierarchy Process (AHP) - Rational Decision Making Process • Define hierarchy of criteria • Calculate weighs for all criteria based on pairwise comparisons • Evaluate results based on a performance score

21. Making Sense of the Data Analytic Hierarchy Process (AHP) - Rational Decision Making Process Pairwise comparison of ratings

22. Making Sense of the Data Analytic Hierarchy Process (AHP) - Rational Decision Making Process Calculate weights for criteria based on pairwise comparisons

23. Making Sense of the Data Calculate weights based on pairwise comparisons Weights

24. Making Sense of the Data Pair-Wise Analysis - 3 different material categories • Ratings and weights for the structure class will change based on one of the three material types. Concrete Metal Plastic • Ratings and weights for the Hydraulic and Geotechnical classes always stay the same.

25. Making Sense of the Data Evaluate results based on a performance score Culvert Performance Score • Culvert performance score is used to develop short and long term planning. • Based on the score the culvert is zoned into four different categories. • Good, Fair, Poor, and Critical. • Uses the same scoring range for all three material categories. • Integrated into Drainage Facility Management System

26. Making Sense of the Data Metal Culverts:

28. DFMS Condition Assessment Inspection Return Interval: Based on condition of the culvert using the performance scores. Good 20 years Fair 10 years Poor 2 years Critical 1 year

29. Culvert Assessment Information Oregon DOT • Improved project prioritization and selection of culvert projects. • Desk and project scoping for culvert repairs and replacement. • Maintenance of culverts: • Plugged with sediment • Drift, • Vegetation • Scour