Optimisation des coûts de la réhabilitation hydraulique et environnementale d'un réseau de drainage urbain

Abstract

Urban drainage networks assessment allows one to observe that a system that has been designed and built a few years ago is gradually becoming subject to pressurized flow, or even backups and overflows. The impacts on the balance of the aquatic environment are of concern and can have consequences seriously affecting the safety of drinking water resources and the recreational use of these environments. These dysfunctions are often due on one hand to the runoff flows increase caused by urbanization and climate change and on the other hand by the reduced hydraulic capacity caused by wear and lack of network maintenance. In order to overcome these environmental and hydraulic dysfunctions, we have implemented an optimization program for the related rehabilitation interventions. Potential rehabilitation interventions mainly focus on Best Management Practices (BMPs) but, may also include conventional methods of rehabilitation and even the resizing and reconstruction of problematic pipes. The program developed has been applied to a real network and a synthetic one according to several retention and design storm scenarios. The application of this methodology on the synthetic network allowed one to illustrate the benefits of integration of BMPs at the time of design to optimize the costs of construction and management in the short term while avoiding long term hydraulic and environmental problems. The case study focuses on the borough of Verdun network which is subjected to many environmental and hydraulic malfunctions. The proposed program allows one to define the best combination of retention, rehabilitation and pipes resizing leading to the targeted hydraulic and environmental performances with a minimum cost.

Date	16 May 2011
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Saad Bennis (Supervisor)