| Factors identified that can lead to pipe blockages. | Factor identified or cited by author | ||||||
| Arthur (2008) | Davies (2001) | Fenner (2000) | Lillywhite (1979) | Littlewood (2000) | Marlow (2011) | Rodriguez (2012) | |
| Age of sewer |
| X |
|
|
|
| X |
| Depth of cover |
| X | X |
|
| X | X |
| Fats, oils and grease |
|
| X |
| X | X | X |
| Flat gradients | X |
| X |
|
|
| X |
| Joint/material type |
| X |
| X |
| X |
|
| Junctions | X |
|
| X | X |
|
|
| Ground conditions |
| X | X |
|
| X |
|
| Gross solids/misuse | X |
|
| X | X | X | X |
| Intermittent flow | X |
|
|
| X | X |
|
| Length of sewer | X |
| X |
|
|
| X |
| Self-cleansing velocity | X |
|
|
| X |
|
|
| Solid deposition | X |
| X |
| X |
|
|
| Small diameter | X |
| X |
|
| X | X |
| Tree roots |
| X | X | X | X | X | X |
| Quality (construction) |
|
|
| X | X | X | X |