4. Effluents: quantitative aspects
4.1 Principles of flow estimation
Determining the dimensions of drainage structures requires calculating the flow to be evacuated.
In a combined system, where stormwater and wastewater are collected in the same pipe, wastewater flow is often considered negligible compared to stormwater flow, except in certain situations such as when calculating outfalls.
In a segregated system, water from pavement washing does not normally contribute to increased flows in the stormwater pipes. In a pseudo-separated system, on the other hand, it is necessary to combine wastewater flows with the small amount of rainwater collected in the wastewater network.
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Two types of water flow used
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Effluents: quantitative aspects
Conclusion
Bibliography
Standards and norms
- sanitation facilities – Title I: networks - Fascicule n° 70 -
- sanitation facilities – Title II: Stormwater collection, conveyance and storage facilities - Fascicule n° 70 -
- équipement d´installations de pompage pour réseaux d'évacuation et d'assainissement - Fascicule 81-1 -
- mise en œuvre et essai des branchements et collecteurs d'assainissement. - NF EN 1610 -
- réseaux d'évacuation...
Regulations
European Directive of May 21, 1991 concerning urban waste water treatment.
Arrêté du 22 juin 2007 relatif à la collecte, au transport et au traitement des eaux usées des agglomérations d'assainissement ainsi que à la surveillance de leur fonctionnement et de leur efficacité, et aux dispositifs d'assainissement non collectif recevant une charge brute de pollution organique supérieure à 1,2 kg/j de DBO...
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