Post Storm Monitoring
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Talk Dirt to Me : Post Storm Monitoring A Flood Risk Analysis Network (FRANk) discussion Presented by: Matt Johnston, Senior Manager David Gingerich, Environmental Technologist November 20th, 2019 Business Need Scheduled inspections vs. Post-storm inspections TRCA’s Erosion Risk Management Program Presentation Outline FRANk: a Post-storm monitoring tool FRANk development (2018) FRANk growth (2019) Future of hazard monitoring Toronto and Region Conservation Authority 2 Example TRCA structure 2006 2011 2012 2015 2018 Toronto and Region Conservation Authority Toronto3 and Region Conservation Authority 3 Infrastructure Hazard appearing at Erosion Control Structure 2011 2016 2018 (July) 2013 (May) 2017 2018 (Aug) 2019 Toronto and Region Conservation Authority 4 TRCA Ravine & Waterfront EC Structures : 1130 Erosion Hazard Sites • Typically follow a public or staff inquiry • Sites are generally inspected on an annual basis Toronto and Region Conservation Authority 6 TRCA Erosion Hazard Sites : 490 TRCA Partnership Programs • York Region Infrastructure Hazard Monitoring Program • Peel Region Infrastructure Hazard Monitoring Program • Toronto Water Stream Valley Infrastructure Program • City of Brampton City Wide Watercourse Assessment Study Toronto and Region Conservation Authority 8 York & Peel Infrastructure Hazard Sites : 1915 TRCA Annually Inspected Sites : 3500 + Flood Post Risk Storm Monitoring Analysis Network Toronto and Region Conservation Authority 11 What Do We Do? • Analyze real-time stream and rain gauge data • Determine which watercourses hit hardest • Deploy inspection staff to quantify movement “Why inspect structures without high flow impacts ?” Toronto and Region Conservation Authority 12 TRCA Real-Time Rain Gauges 24 gauges Toronto and Region Conservation Authority 13 TRCA Real-Time Stream Gauges 14 gauges Toronto and Region Conservation Authority 14 Env CC Can Real-Time Stream Gauges 16 gauges Toronto and Region Conservation Authority 15 FRANk Real-Time Input 54 gauges Toronto and Region Conservation Authority 16 FRANk Gauge – Site Connections Brickworks Precipitation Gauge West Don at Steeles Stream Gauge Hydrologic Hydraulic • Initial threshold = “First Flush” (25 mm / 24 hr) • Initial threshold based on limited data • Gauge proximity = uncertain distribution • Threshold calibration required Toronto and Region Conservation Authority 17 FRANk The Machinations March 2018 54 Real-Time1440July Gauge Sites 2018 Stations TRCA(Threshold EC Structures Exceedance + = York Triggered Infrastructure Scoring) (TotalCollect Score Exceedance Input = PriorityData Site) Toronto and Region Conservation Authority 18 FRANk Calibration Site Visit 2018-07-06 2018-07-04 Toronto and Region Conservation Authority 19 FRANk Calibration Events Two men trapped in an elevator 2018-07-11 Approx. Bankfull Dave leaving the province Threshold Toronto and Region Conservation Authority 20 FRANk Event Calibration (Aug 7th, 2018) • Two men were saved • Blue Jays lost • FRANk-furter anyone … ? Toronto and Region Conservation Authority 21 FRANk Metrics 2018 • 15 Storm Events • 567 Recommended Inspections • 450 Completed Inspections 80% Completion rate Toronto and Region Conservation Authority 22 FRANk Collaboration & Data Sharing Toronto and Region Conservation Authority 23 FRANk Events Comparison AugustJuly 17 th7,th 2019, 2018 “Ninja”0 TRCA rain Storm gauges 213 TRCA City rainof TO gauges gauges 16 City of TO gauges Toronto and Region Conservation Authority 24 FRANk “Ninja” Storm Triage • 6.5 km of watercourse inspected • 70 sites visually inspected • 4 sites recommended for minor works • Hazards reported to partners Toronto and Region Conservation Authority 25 FRANk ”Ninja” Storm Chasing Etobicoke Creek Black Creek Yellow Creek Toronto and Region Conservation Authority 26 FRANk ‘N’ Metrics 2019 • 6 Storm Events • 90 Recommended Inspections • 90 Completed Inspections Why so few … ? • Higher thresholds • Focused inspection areas • And … Toronto and Region Conservation Authority 27 FRANk ‘n’ Future Growth 8 – 16 m loss During a “spring” thaw event … min. 1775 m3 displaced • Do ice floes increase the bankfull2018 Shoreline flow force ? (~ 75.25 mASL) 2017 Shoreline (~ 75.85 mASL) Toronto and Region Conservation Authority 28 FRANk ‘n’ RPAS Inspection ? Toronto and Region Conservation Authority 29 FRANk ‘n’ RPAS Failure ? Toronto and Region Conservation Authority 30 Gauge Adjusted Radar Rainfall (GARR ‘n’ FRANk) • Region of Peel & City of Toronto potential partnerships • 1 km2 grid potential Toronto and Region Conservation Authority 31 Thank you for your time; we look forward to your questions. - Matt & David www.trca.ca .