the dissertation should be focusing on comparing the size, shape, material and how these factors affect the strength of the highway culverts.
moreover, you can compare case studies of the highway culvert around the word comment and analyse on it. please note that this has to be submitted to turnitin.
please check this pdf file onine my dissertation should be something like this…www.fhwa.dot.gov/engineering/hydraulics/pubs/12026/hif12026.pdf?
plus i dont need literature review i only need the dissertation itself