Évaluation de l'impact de l'assainissement urbain sur la qualité des eaux du bassin        versant de la rivière Chaudière à l'aide du système de modélisation intégrée GIBSI

Mailhot, Alain; Rousseau, Alain N.; Salvano, Esther; Turcotte, Richard; Villeneuve, Jean‐Pierre

doi:10.7202/705491ar

Cited by 8 publications

(4 citation statements)

References 4 publications

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“…We selected GIBSI because the research team was familiar with the source code and it could, therefore, be more easily adapted if required. The GIBSI model had been previously used to (i) quantify impacts of a municipal clean water program on the water quality of the Chaudière River watershed in Quebec (Mailhot et al, 2002); (ii) predict the impact of deforestation on the hydrologic regime of a 728‐km 2 Quebec watershed (Lavigne et al, 2004); (iii) develop a risk‐based total maximum daily load assessment framework (Rousseau et al, 2002); (iv) illustrate the importance of valuing costs and environmental benefits associated with water quality improvement in the assessment of mandatory nutrient management plans required by Quebec legislation (Salvano et al, 2006); (v) evaluate the response of a watershed to future land cover scenarios under climate change conditions (Quilbé et al, 2008a); (vi) assess the effect of climate change on river flow (Quilbé et al, 2008b); (vii) assess the effects of historical land cover changes on runoff and low flows (Savary et al, 2009); (viii) characterize watershed processes under current conditions and, after implementation of BMPs, examine water quality changes with respect to nutrients and sediments (Rousseau 2008b and unpublished observations); and (ix) predict the impact of BMPs on biological integrity in a small impacted agricultural watershed (Grenier, 2010).…”

Section: Methodsmentioning

confidence: 99%

A Hydrological Modeling Framework for Defining Achievable Performance Standards for Pesticides

et al. 2012

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This paper proposes a hydrological modeling framework to define achievable performance standards (APSs) for pesticides that could be attained after implementation of recommended management actions, agricultural practices, and available technologies (i.e., beneficial management practices [BMPs]). An integrated hydrological modeling system, Gestion Intégrée des Bassins versants à l'aide d'un Système Informatisé, was used to quantify APSs for six Canadian watersheds for eight pesticides: atrazine, carbofuran, dicamba, glyphosate, MCPB, MCPA, metolachlor, and 2,4-D. Outputs from simulation runs to predict pesticide concentration under current conditions and in response to implementation of two types of beneficial management practices (reduced pesticide application rate and 1- to 10-m-wide edge-of-field and/or riparian buffer strips, implemented singly or in combination) showed that APS values for scenarios with BMPs were less than those for current conditions. Moreover, APS values at the outlet of watersheds were usually less than ecological thresholds of good condition, when available. Upstream river reaches were at greater risk of having concentrations above a given ecological thresholds because of limited stream flows and overland loads of pesticides. Our integrated approach of "hydrological modeling-APS estimation-ecotoxicological significance" provides the most effective interpretation possible, for management and education purposes, of the potential biological impact of predicted pesticide concentrations in rivers.

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Section: Methodsmentioning

confidence: 99%

A Hydrological Modeling Framework for Defining Achievable Performance Standards for Pesticides

et al. 2012

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“…A detailed description of the soil database can be found in Duchemin et al (2001). Mailhot et al (2002), Lavigne et al (2004), and Rousseau et al (2002a), respectively used GIBSI to: (i) quantify impacts of a municipal clean water program on the water quality of a 6,682-km 2 watershed; (ii) predict the impact of deforestation on the hydrological regime of a 728-km 2 watershed; and (iii) develop a total maximum daily load assessment approach. The computational units (spatial simulation unit or SSU) used in GIBSI consist of elementary subwatersheds.…”

Section: Overview Of Gibsimentioning

confidence: 99%

An Environmental Benefit-Cost Analysis Case Study of Nutrient Management in an Agricultural Watershed

Salvano¹,

Rousseau²,

Debailleul³

et al. 2006

Canadian Water Resources Journal

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This paper illustrates the importance of valuing environmental goods and services associated with water quality improvements when assessing implementation of on-farm nutrient management plans as required by the Quebec Regulation Respecting Agricultural Operations (RRAO). Based on a case study in the Chaudiere River watershed, two scenarios were considered using the integrated, economichydrological, modelling framework provided by GIBSI: (i) a base-case scenario assuming application of all available manure; and (ii) an on-farm nutrient management scenario based on meeting phosphorus crop requirements with manure and treating any manure surpluses. Two types of management units were selected to evaluate these scenarios: (i) contiguous municipalities (administrative units of agricultural development); and (ii) subwatersheds. Results showed that management at subwatershed levels had larger benefit/cost (B/C) ratios when compared to contiguous municipalities. This illustrates that the watershed is a more meaningful management unit than the municipality, which is not a hydrological unit. For one of those subwatersheds, the B/C ratio was close to one although only various recreational benefits were accounted for in the evaluation. In all likelihood, if a more holistic set of benefits were accounted for, a B/C ratio greater than or equal to one would have resulted. A sensitivity analysis revealed that variations of 37.5%, -22.5%, and -20% for monetary benefits, on-farm manure treatment costs, and average probabilities of exceeding the targeted water quality standard (prevention of eutrophication of rivers), respectively, were necessary to obtain a B/C ratio greater than one.

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“…On the Chaudière River watershed, 35 waste water treatment plants (WWTP) were built and the population being connected reached 95% in 1997. The objective of this study (Mailhot et al, 2002) was to assess the effect of this program on water quality. The first step was to characterize WWTP properties (i.e.…”

Section: The Chaudière River Watershedmentioning

confidence: 99%

“…The development of GIBSI was funded by grants from the Québec Ministry of Environment (1995Environment ( -1998 1999-2002 and the Fonds québécois de la recherche sur la nature et les technologies (FQRNT, 2004(FQRNT, -2007 Edited by: R. Moussa…”

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confidence: 99%

GIBSI: an integrated modelling system for watershed management – sample applications and current developments

Quilbé

Rousseau

2007

Hydrol. Earth Syst. Sci.

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Abstract. Hydrological and pollutant fate models have long been developed for research purposes. Today, they find an application in integrated watershed management, as decision support systems (DSS). GIBSI is such a DSS designed to assist stakeholders in watershed management. It includes a watershed database coupled to a GIS and accessible through a user-friendly interface, as well as modelling tools that simulate, on a daily time step, hydrological processes such as evapotranspiration, runoff, soil erosion, agricultural pollutant transport and surface water quality. Therefore, GIBSI can be used to assess a priori the effect of management scenarios (reservoirs, land use, waste water effluents, diffuse sources of pollution that is agricultural pollution) on surface hydrology and water quality. For illustration purposes, this paper presents several management-oriented applications using GIBSI on the 6680 km 2 Chaudière River watershed, located near Quebec City (Canada). They include impact assessments of: (i) municipal clean water program; (ii) agricultural nutrient management scenarios; (iii) past and future land use changes, as well as (iv) determination of achievable performance standards of pesticides management practices. Current and future developments of GIBSI are also presented as these will extend current uses of this tool and make it useable and applicable by stakeholders on other watersheds. Finally, the conclusion emphasizes some of the challenges that remain for a better use of DSS in integrated watershed management.

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Évaluation de l'impact de l'assainissement urbain sur la qualité des eaux du bassin versant de la rivière Chaudière à l'aide du système de modélisation intégrée GIBSI

Cited by 8 publications

References 4 publications

A Hydrological Modeling Framework for Defining Achievable Performance Standards for Pesticides

A Hydrological Modeling Framework for Defining Achievable Performance Standards for Pesticides

An Environmental Benefit-Cost Analysis Case Study of Nutrient Management in an Agricultural Watershed

GIBSI: an integrated modelling system for watershed management – sample applications and current developments

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