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Colloque avec actes et comité de lecture. Internationale.; International audience

Colloque avec actes et comité de lecture. Internationale.; International audience

Colloque avec actes et comité de lecture. Internationale.; International audience

The Quebec provincial government (Minist\303\250re de l\342\200\231Environnement du Qu\303\251bec) has defined environmental discharge objectives (EDO) to protect receiving water bodies and their use against CSOs, SSOs and storm water pollution. The objectives have been established on the basis of direct and indirect water uses, which are to be protected or rehabilitated. They have been defined in terms of maximum overflow frequencies per area and based on the uses of the receiving water bodies. The City of Montreal is committed to the implementation of a program to control the overflows from the island\342\200\231s combined sewers in order to comply with the objectives and to rehabilitate the St. Lawrence River and of the Rivi\303\250re des Prairies. Six solution scenarios in as many intervention programs are presented and evaluated, from the simplest to the more complex. This document presents the environmental objectives with regard to discharge in both media and based on the long-term, as well as the intervention scenarios to reach these goals. The assessment is based on environmental and financial criteria, as well as implementation and operation criteria.

The operation of large interceptor systems is complex. In most systems, static regulators are used to limit inflows into interception system and ensure that treatment plant capacity is never exceeded. Full capacity is then hardly ever used and the system still overflows often. To capture more flow, especially in recurrent wet weather, interception may be regulated by dynamic regulators. Regulating these structures according to water levels in the interceptors may yield significant performance improvements but it doesn\342\200\231t help operators figure how much flow will reach the plant and when. Hence, we may provide operators with decision support tools that will predict and regulate flows according to current and available plant and pump station capacities, wastewater treatment plant (WWTP) configuration, control devices and equipment status, and size and extent of wet weather events. The City of Montreal is finishing the upgrade of its local reactive Real-Time Control system to a global optimal RTC (GO RTC) system with radar rainfall predictive capabilities. The system optimizes regulated flows in the interceptors and to the WWTP during wet weather. This paper covers the system architecture, the expert system main modules, the field equipment needs, the main steps of implementation, and initial operational results.

National audience

Water resources management deals with multiple interacting factors. An integrated model applied to a mediterraneen river bassin includes the relation between the watershed, human activities, and surface and underground water, both in terms of water quantity and water quality. Some of its simulation results disturbs the outlook into the pollution water quality relation, leads to reflections on water quality monitoring, and reveals the potential and the limits of an integrated approach to water management., La gestion des ressources en eau requiert la prise en compte de multiples facteurs en interactions. Le modèle présenté, appliqué à la gestion de l'eau d'un bassin méditerranéen, intègre la relation entre le bassin versant, les activités humaines et les milieux superficiels et souterrains, du point de vue des quantités aussi bien que de la qualité. Quelques résultats de simulation à l'aide de ce nouvel outil remettent en question les tiens entre pollution et qualité de l'eau, engagent une réflexion sur le suivi de la qualité de l'eau, et mettent en exergue les capacités et les limites d'une approche intégrée de l'eau., Colas H., Bocquillon C., Valette F. 3. - Modélisation de la gestion des ressources en eau dans les zones littorales méditerranéennes. Application au cas du bassin versant du Lez. In: L'avenir de l'eau. Quelques réponses des sciences hydrotechniques à une inquiétude mondiale. Vingt deuxièmes journées de l'hydraulique. Paris, 15-17 septembre 1992. Tome 3, 1992.

* INRA, Station de Science du Sol, Montfavet Diffusion du document : INRA, Station de Science du Sol, Montfavet