Managing Selected Transportation Assets: Signals, Lighting, Signs, Pavement Markings, Culverts, and Sidewalks (2007) / Chapter Skim
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Pages 87-105
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OVERVIEW Pipe culverts and box culverts (referred to collectively as culverts in this chapter) allow for drainage under and around highways, streets, and sidewalks, providing stability to the road structure and preventing flooding of surrounding areas.
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89 27% of responding state and local agencies reported having a preventive maintenance program, as compared with the 20% reported in Figure 74. MEASURING ASSET PERFORMANCE The information provided by agencies on performance measurement of culverts is summarized in Figure 75, based on categories of performance factors similar to those described in chapter two.
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0 20 40 60 80 100 No Response No Specific Approach Other Pct. of Total Budget Judgment, Politics Previous + Adjustments Pct.
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0 20 40 60 80 100 No Response Other No Maintenance Responsibility Deferred Maintenance Worst First Prioritized -- Avail.
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guidelines would be needed for other materials such as plastic pipe (Wyant 2002)
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93 ASSET SERVICE LIFE Factors Affecting Service Life The service life of a culvert pipe is influenced by factors related to the pipe and its placement, the drainage water it carries, and the soil that surrounds it. Studies have shown that no single factor alone is an adequate determinant of service life.
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cement and aggregates, as well as reinforcing steel, need to be considered. Acid, caused by acidic soil or aggressively acidic water runoff, can also degrade concrete.
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95 that identified at least one method, their selections focused on agency experience, professional judgment, and manuals or guidelines that individual agencies have prepared, which inform the estimation of service life. Within this context, agencies explained their evaluation of the suitability of different culvert materials for new installation design (none addressed the use of service life for rehabilitation and replacement)
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96 Component and Material No. of Responses Minimum (Years)
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87 6 N o. o f R es po ns es 5 4 3 2 1 0 0 10 20 30 40 50 60 70 80 90 100 Estimated Service Life, Years FIGURE 82 Estimated service life of reinforced concrete box culverts.
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to determine the recommended types of pipe material, coatings, and other installation details. Agencies differ, however, in the manner and degree to which they simplify the results for practical use in design.
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99 Missouri DOT The Missouri DOT has been studying the durability and performance of galvanized CSP and reinforced concrete pipe since the 1930s. Its findings have suggested a service life of 50 years for CSP and almost 100 years for reinforced concrete pipe.
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The culvert rating approach used by the Ohio DOT since 1982 was updated in 2003, and followed by the development of a culvert risk assessment methodology (Mitchell et al.
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101 expand their application (Wilson 2000)
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Synthesis 303. When asked whether they predicted service life as part of their decision process for selecting culvert remedial treatments, only 13 of 55 agencies (24%)
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103 and foundation failure resulting from a failed culvert (Caltrans Supplement .
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performance/accountability reports such as dashboards were the most prevalent items selected. Agencies characterized their IT systems for culverts as shown in Figure 84.
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105 Ellor 2000)
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Furthermore, there is inadequate or no evaluation of the impacts of extending existing culverts during road reconstruction, in terms of changes to the structural and hydraulic characteristics of a culvert. Dakota County, Nebraska, commented that there should be more involvement in culvert management with the Natural Resources Conservation Service (a unit of the U.S.
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