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Table 8 Part of applying requirement engineering on longitudinal drainage system
| External system | Operational requirement | Related system or object |
|---|---|---|
| watershed | The natural watershed must not receive the waters of the longitudinal network whatever the conditions of rainfall, up to centenale | Longitudinal drainage system |
| Functional vision (functions and systems) | Related system or object | |
| The longitudinal drainage system must be able to carry a flow for Q25 | Longitudinal drainage system | |
| Organic vision (physical architecture) | Related system or object | |
| The longitudinal drainage network must consist of a pipe that allows flow Q25 | Piping (part of longitudinal drainage system) |
