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