Center for Transportation Studies University of Minnesota
Recessed culverts are often installed in Minnesota to facilitate aquatic organism passage (AOP) by
providing a natural streambed through the culvert. The least expensive option when installing a recessed
culvert is to allow the culvert to fill in with sediment naturally over time; however, previous field studies
suggest that in many cases, sediment fails to deposit within the culvert. The objective of this research was
to understand the function of a culvert set below the streambed elevation under various sediment transport
conditions. Laboratory experiments were designed to assess the performance of recessed culverts across a
range of geomorphic characteristics representative of Minnesota streams. These experiments explored the
functionality of a culvert that is prefilled with sediment representative of the stream as a part of the
installation process against one that is empty after installation and assessed the potential for headcutting
and downstream degradation. The experiments evaluated the need for artificial roughness installations
within recessed culverts in high gradient streams. Three sets of experiments were conducted examining:
1) the effect of sediment grain size, slope, and flow hydrograph on sediment transport through a single
recessed box culvert, 2) the effect of bed roughness structures on sediment stability in a single recessed
box culvert in high-gradient streams, and 3) the effect of culvert offset and skew on sedimentation in
Minnesota Department of Transportation Research Services & Library
Kozarek, Jessica; Mielke, Sara.
Sediment Transport through Recessed Culverts: Laboratory Experiments.
Center for Transportation Studies University of Minnesota.
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