Machine Learning and Statistical Test–Based Culvert Condition Impact Factor Analysis

Table 3

Definitions of input variables.

Variable name	Definition
Age	Age of the culvert
Number of cells	The number of culvert cells
Broken back	Whether the culvert has broken back
Culvert shape	Shape of the culvert
Span	Distance between inside faces of the culvert
Rise	The maximum rise of the culvert
Slope	The slope of the culvert
Length	Length of the culvert
Closed system	Whether the system is closed
Abrasive conditions	The presence of granular material
pH	The pH of the water in the culvert
ADT	Average daily traffic counts
Cover height	Height of cover above the culvert