Skip to main content

Currently Skimming:

3 State of the Practice (Survey Results)
Pages 25-47

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 25...
... commented on a lack of available information or indicated a degree of uncertainty in their reporting. Based on the respondents that provided information related to the estimated percentage breakdown of culvert materials and shapes in their inventory, circular reinforced concrete culverts made up approximately 35% of the total reported culvert inventory, and circular galvanized corrugated metal culverts made up approximately 30%.
From page 26...
... answered that they do not have an expected design service life of state DOT roadway and embankment culverts. Question 2a was provided to the 37 respon dents that answered "yes" to having an expected design service life for roadway and embank ment culverts.
From page 27...
... Figure 13 shows expected design service life of culverts as specified by state DOTs, and Figure 14 shows a summary of the data. Question 2b asked respondents whether culvert material or surrounding soil type influences the expected design service life of the culvert.
From page 28...
... . Figure 15.   Responses to Question 2b: Does the specified service life of state DOT roadway and embankment culverts change based on culvert material and/or soil type?
From page 29...
... provided links and documents related to service life of culvert material but did not explicitly provide risk assessment methodologies. Colorado DOT provided a link to a formal risk assessment program employed Figure 16.   Responses to Question 3: Approximately how many culverts are owned and maintained by the DOT?
From page 30...
... indicated that multiple practices are implemented concurrently to help determine if a culvert should be considered for replacement or rehabilitation. Figure 17 shows the number of state DOTs that implement various practices to determine culvert replacement or rehabilitation to enhance resiliency.
From page 31...
... Only replaced if anticipated service life will not outlast the expected life of the current pavement replacement or pavement Wisconsin maintenance project. Figure 18.   Responses to Question 6: Which of the following methods does the state DOT employ to aid in decisions related to replacing or rehabilitating roadway and embankment culverts to enhance resiliency?
From page 32...
... Question 9 asked respondents to rank culvert maintenance and inspection practices with regard to enhancing culvert resiliency. Respondents indicated that scour or channel degradation Figure 19.   Responses to Question 7: For which of the following culvert sizes does the state DOT have a formal culvert asset management system in place?
From page 33...
... 15 16 (38%) 10 5 0 Culvert Size Only Culvert Size and Material Neither Culvert Size Nor Material Affects Inspection and Maintenance Practices Figure 20.   Responses to Question 8: Does size and/or material of DOT culverts affect inspection and maintenance practices?
From page 34...
... The ranking of culvert maintenance and inspection practices based on importance to state DOTs for enhancing resiliency is shown in Figure 23. Question 10 asked respondents to rank the same list of culvert maintenance and inspec tion practices as listed in Question 9 but based on frequency of implementation with regard to enhancing culvert resiliency.
From page 35...
... . 3.4 Failure Mechanisms, Durability, and Practices to Enhance Resiliency Question 11 asked respondents to rank the most frequently documented failures exhibited by state DOT culverts related to deficiencies in resiliency.
From page 36...
... Figure 24.   Responses to Question 10: Of the following culvert maintenance and inspection practices, rank their frequency of implementation with regard to enhancing culvert resiliency. (Numbers out of 42 total respondents)
From page 37...
... Figure 25.   Responses to Question 11: Rank the most common documented failures exhibited by state DOT culverts related to deficiencies in resiliency. (Numbers out of 42 total respondents)
From page 38...
... A ranking of 1 indicates "most/extremely common," and 5 indicates "not at all common." The responses shown are the average rankings of the 42 state DOT respondents for each failure mode.
From page 39...
... State of the Practice (Survey Results)    39 Table 3.   Responses to Question 12: Select and rank the following practices employed by the state DOT to enhance the resiliency of state DOT culverts, with 1 being the most common, 2 being the second most common, .
From page 40...
... Question 15 asked respondents to estimate the number of state DOT culverts of each shape and material that had been replaced due to lack of resiliency or premature damage over the previous 20 years. Fourteen of the 42 DOT respondents (33%)
From page 41...
... ranking that attribute as less important. Table 4 shows the importance of specific attributes to state DOTs when replacing culverts to enhance resiliency.
From page 42...
... Figure 29.   Responses to Question 15: Approximately how many state DOT culverts of each type and material have been replaced due to lack of resiliency or premature damage over the past 20 years? Please select an answer for each of the options.
From page 43...
... State of the Practice (Survey Results)    43 Table 4.   Responses to Question 16: When replacing state DOT culverts to enhance resiliency, assign the importance of the following attributes.
From page 44...
... 3.6 Summary of Survey Results This chapter has presented the results of the survey about state DOT practices to enhance resiliency of roadway and embankment culverts. Forty-two state DOTs completed the survey and shared their current state of the practice.
From page 45...
... indicated that neither culvert material nor soil type affects the expected design service life of culverts. 3.6.2 Life-Cycle Cost and Risk Assessment • Thirty-two of the 41 state DOTs that responded (78%)
From page 46...
... Of the state DOTs that indicated size does affect culvert inspection and maintenance practices, the survey results indicate that culvert inspections typically take place every 5 years or more, but larger-sized culverts are generally inspected more frequently than smaller-sized culverts. • Many of the practices the state DOTs ranked as extremely important, very important, and important for enhancing culvert resiliency are implemented every 5 years or more or are not practiced at all.
From page 47...
... Thirty-eight state DOTs (90%) employ multiple post-event response practices to maintain, manage, and resume culvert function and performance after extreme weather events.


This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More information on Chapter Skim is available.