LID Measures for Water Supply Source Protection: the Case of Quebec City and St-Charles Lake
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2 6 th Annual TRIECA Conference March 22 & 23, 2017 LID Measures for Water Supply Source Protection: the Case of Quebec City and St-Charles Lake Gilles Rivard, ing. M. Sc. Vice-President Urban Hydrology (Lasalle-NHC) Water supply intake Old Quebec City William Verge 1, Geneviève Brisson 2, Alexandre Baker 3 and Denis Brisson 4 1 APEL; 2 WSP; 3 Environment, Quebec City; 4 Engineering Planning, Quebec City
3 THE FROG EXPERIMENT RAPID SLOW I never worry about action, but only about inaction Churchill
4 THE CONSEQUENCES MODEL + Doubt and decision -
5 OUTLINE GENERAL CONTEXT MONITORING FOR WATER QUALITY BYLAWS AND REGULATION LID MEASURES MODELLING BARRIERS AND KEY SUCCESS FACTORS
6 GENERAL CONTEXT 2004 Vulnerability Assessment 2016
7 GENERAL CONTEXT Components of source protection CCME, 2004
8 GENERAL CONTEXT Saint-Charles River Saint-Lawrence River Montmorency River Des Roches Lake Groundwater Quebec City - Main Water Supply Sources
9 GENERAL CONTEXT Quebec City Specific Bylaw for Water Source Protection (2011) St-Charles Lake Watershed Other municipalities in Watersheds Water Intake St-Charles River 9
10 GENERAL CONTEXT Quebec Urban Community (CMQ) Vulnerability Assessment 1 0
11 GENERAL CONTEXT Quebec Urban Community (CMQ) Interim Bylaw 1 1
12 GENERAL CONTEXT Partnership Association pour la protection de l environnement du lac Saint- Charles et des Marais du Nord (APEL) Continuous Monitoring since 2008 (42 sites)
13 GENERAL CONTEXT Main tributaries Des Hurons River Smaller creeks and ditches Jaune River
14 GENERAL CONTEXT Report in 2011 Diagnostic for stormwater management in small tributaries Concepts for retrofit for water quality control
15 MONITORING AND WATER QUALITY Monitoring sites (APEL, 2016) 42 Sites for pollutants 36 for discharge Some analyses at the Quebec City Lab (environmental Services)
16 MONITORING AND WATER QUALITY Water Quality Index (APEL, 2016)
17 MONITORING AND WATER QUALITY Classification for small tributaries (APEL, 2016)
18 Quality Index (without ph) MONITORING AND WATER QUALITY Relation between developed areas and Quality Index (APEL, 2015) Percentage of Developed Areas
19 MONITORING AND WATER QUALITY Relation between developed areas and Quality Index Schueler et al., 2009
20 BYLAWS AND REGULATION 2010 Quebec Urban Community 20 modifications and updates since Infiltration of runoff for 6 mm (50 % of annual events) + Criteria for slopes and percentage of natural cover preservation
21 BYLAWS AND REGULATION MANUAL FOR DEVELOPERS IN WATERSHEDS FOR WATER SUPPLY (QUEBEC CITY)
22 LID MEASURES Limited interventions for specific reaches close to the outfall Swales with bioretention Minimize the costs to provide quality control while maintaining level of service Swales with bioretention Bioretention area Outfall to the lake
23 LID MEASURES Different types of measures Swale with minimal vegetation Swale with infiltration Swale with bioretention Ditch with catch basin Bioretention areas
24 LID MEASURES Swale with vegetation
25 LID MEASURES Swale with infiltration
26 LID MEASURES Swale with bioretention
27 LID MEASURES Ditch with catch basins
28 LID MEASURES Bioretention areas
29 LID MEASURES INLET CONFIGURATIONS
30 LID MEASURES TYPICAL ANALYSIS FOR RETROFITTING
31 LID MEASURES IMPLEMENTATION 2016
32 Distribution cumulative de probabilité (%) MODELLING OBJECTIVES AND RESULTS Station de l'aéroport Jean-Lesage (Québec) Pluie de 1 mm et plus (1489 événements de 1961 à 1991 (mai à octobre)) Durée inter-événement de 6 heures mm pour 90 % Quality Design Storm 6-hours - 26 mm Historical Time Series Quantité de précipitation par événement (mm)
33 MODELLING OBJECTIVES AND RESULTS Different configurations
34 MODELLING OBJECTIVES AND RESULTS Primary reason for pollutant load reduction of total nitrogen and total phosphorus : significant runoff volume reduction Taylor and Cardno Tec, 2013
35 MODELLING OBJECTIVES AND RESULTS Main Target bioretention abstraction volume (BAV)
36 MODELLING OBJECTIVES AND RESULTS Focus on retrofitting ditches close to the outfalls
37 MODELLING OBJECTIVES AND RESULTS
38 MODELLING OBJECTIVES AND RESULTS Continuous simulation to evaluate environmental benefits
39 MODELLING OBJECTIVES AND RESULTS Volume reduction more important for small storms
40 MODELLING OBJECTIVES AND RESULTS Evaluation for smallscale interventions Evaluation for complete retrofitting with bioretention or infiltration (loss at 25 mm/h)
41 BARRIERS REGULATORY FRAMEWORK DESIGN GUIDELINES AND FEEDBACK MAINTENANCE FOR COLD CLIMATE LEVEL OF SERVICE CONFLICTING LID GUIDANCE PLANNING PROCESS EDUCATION TRAINING REVIEW PROCESS TERMINOLOGY SAFETY CONSIDERATIONS
42 KEY SUCCESS FACTORS DESIGN Site investigation and soil characterization Mix for Bioretention media (that avoids nutrient leaching while supporting plant community success) Pretreatment and energy dissipation Maintaining hydraulic level of service Different disciplines well integrated IMPLEMENTATION Clear understanding of components and processes involved Erosion and sediment control LONG-TERM MAINTENANCE
43 KEY SUCCESS FACTORS The greatest difficulties lie where we are not looking for them. Goethe
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