Post Storm Monitoring

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