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Table 9 Details in information for object modeling, depending on product requirements
| Operational requirement: The natural watershed must not receive the waters of the longitudinal network whatever the conditions of rainfall, up to centenale | |||
| Object | attributs | dimensionnality | representation |
| pipe and other elements of longitudinal drainage system | Membership system |
| Topological synoptic with connections to retention ponds |
| retention pond | Name, number |
| Topological synoptic |
| Organic requirement: The longitudinal drainage network must consist of a pipe that allows flow Q25 | |||
| Object | attributs | dimensionnality | representation |
| pipe | diameter |
| 3D object to design diameter and tilt |
| retention pond | Name, number, volume, type |
| 2 or 3D representation to design volume, type and operation |
