![]() Some state DOTs have written their own procedural guidelines on relining. The first step is to assess and evaluate the existing culvert, but not just its current condition. An attempt to find installation records and original plans can be important in understanding the material types involved and how it may have been installed. Culvert materials have very different characteristics when it relates to remaining service life, original vs. existing geometric shape, hydraulic capacity and remaining structural capability. A proper culvert inspection includes getting an interior look (via man-entry or entry with video/photographic equipment). It also includes an accurate assessment of what’s observed. A good assessment will include answers to the following questions:ġ. How old is the culvert, and what has it been exposed to from a wear and tear standpoint?Ģ.
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