Hydrology & Hydraulics
ADAPTING TO NEW WEATHER REALITIES
Presentation to Technical Committee of Lake Ontario Integrated Sub watershed Study
March 24, 2014
Neelam Gupta
Manager, Hydrology & Hydraulics Credit Valley Conservation Authority
•
Our weather is changing
•
Real-time Gauge Network
•
Floodplain mapping update
•
July 8
thstorm and its impacts
Presentation Outline
Canadian Press
Canadian Press
Fred Loek, Mississauga News
Recent Extreme Rainfall Events in GTA
Extreme Rainfall Event
Total Rainfall
Amount (mm)
Duration
(hr)
1 Hr Max.
Intensity
(mm/hr)
Peterborough (Trent U), July 14-15, 2004
250.0
16.5
87.2
Toronto (Finch Ave), August 19, 2005
153.4
12.5
116.6
Hamilton (Stoney Creek), July 25-26, 2009
135.5
35.0
60.8
Mississauga (Cooksville), August 4, 2009
68.0
1.0
68.0
Westcentral GTA (Pearson), July 8, 2013
126.0
3.0
96.0
Hurricane Hazel, 15 October, 1954
285.0
48.0
52.5
100 Year Design Storm
118.0
24.0
50.0
Floodplain Vulnerability - CVC Jurisdiction
Watercourse Structures in Floodplain Cooksville Ck 309 (654) Serson Ck 154 Turtle Ck 79 Applewood Ck 20 Lornewood Ck 11 Avonhead Ck 11 Sheridan Ck 8 Birchwood Ck 5 Cawthra Ck 3 Tecumseh Ck 2 Lakeside Ck 0 Clearview Ck 1 Total 603 (948)102 Cheltenham, Boston Mills, &
Ferndale Park 623 0 2 12 1 47 28 34 10 38 100 43 28 34 34 3 3 19 66 3 16 # of Structures in Floodplain Stewarttown
Georgetown (Trailer Park & Other) Norval
Churchville (39), Eldorado Park (1) & Huttonville (7) Brampton Brampton Meadowvale Mississauga Streetsville QEW to Dundas St. Belfountain Inglewood Terra Cotta Melville Caledon Caledon Lake Alton Brimstone Hillsburgh Erin Acton Glen Williams Erin Orangeville
Flood Damage Centre Municipality
Total
Halton Hills Orangeville
Flood Vulnerable Structures within the
Credit River Watershed
Frequency of bank full flows on
Frequency of bank full flows on
Cooksville Creek
Cooksville Creek
2006 2007 2008 2009 2010 2011 2012 2013 0 0 2 5 2 3 4 3 0 1 2 3 4 5 N u m b e r o f e x c e e d a n c ePre 2013 Water Monitoring Network
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CVC relied on Water Survey of Canada (WSC) monitoring network – Other partner organizations who contributed data are:• Other CAs (TRCA, Halton, GRCA)
• Meteorological Service of Canada (MSC) • Upper Tier Municipalities (Region of Peel)
• Lower Tier Municipalities (City of Brampton, City of Mississauga) • Ontario Ministry of Environment
CVC Monitoring Network 2013 and beyond
•
Region of Peel – invested ~ $2 million to build Real-time gauging and flood
watch/warning system
•
CVC operates extensive monitoring network.
– 16 rainfall gauges (CVC)
• 14 rainfall gauges (City of Mississauga)
• 10 rainfall gauges (Region of Peel)
– 27 stream flow gauges (CVC) + 10 WSC stream flow gauges
– 5 climate stations
•
The monitoring network will become an integral part of CVC’s flood
forecasting and warning system and will become a valuable tool to measure
and report on watershed health.
Turtle Ck at Hindhead Park 501210008
Sheridan Creek at Truscott Dr Bridge 501210012
Applewood Creek at St James Ave Bridge 501220009
Serson Creek at Serson Park 501220010
Cooksville Creek at Central Parkway East 501220007
Real Time Flow Gauge
Climate Stations
Lakeshore Climate Station
Silver Creek Conservation Area Acton Climate Station
Caledon Climate Station Orangeville Climate Station
CVC’s Climate Station Name
Proposed Works – 2014
Upgrade existing Climate Station to real-time climate station Weather equipment will be contacted to new Sutron 9210 data loggerAutomatic polling of data through cellular modem
Parameters that will be measured:Air temperature, wind speed & direction, barometric pressure, ground temperature, snow depth, solar
radiations, relative humidity Oakville TWN
Toronto Pearson Int’l Airport
Georgetown WWTP
Fergus Shand Dam
Orangeville MOE
MSC’s Climate Station Name
Outside watershed Outside watershed Within watershed Outside watershed Within watershed Location
Real-time Rainfall
Gauge Network
16 CVC 14 City of Mississauga 40 Total 10 Region of PeelDistribution of Rainfall Gauge Network
Data Management Software
• WISKI (Water Information System-Kisters)
• WISKI software and database system is currently hosted within Region of Peel Network. – Soda system
– Alarm Manager
– Biber, Sked, and Water Quality Modules – Wiski Web Pro
– GIS Graphic Modules
• This software and database system is currently in use at the Ontario Ministry of Natural Resources Stream Forecast Centre and at several other Conservation Authorities.
• This provides CVC with an opportunity to leverage work that has already been done and to partner with the Province and other Conservation Authorities to implement a more cohesive solution
Updated Floodplain Mapping and Modelling
Consultant proposals received and currently under review for:
Clearview, Avonhead, Lakeside, Turtle, Birchwood, Lornewood, Moore, Cumberland, Tecumseh, Cawthra, Serson and Applewood creeks
Extensive Survey Work
Separate RFP to update flood lines for Cooksville Creek to be issued in
November
RFP to evaluate climate change vulnerability and sensitivity across southeast Mississauga planned for 2014
July 8th Storm
Extreme rainfall, prolonged power
outages, transit delays, flooded
highways and streets
Extensive basement flooding in
parts of Mississauga and Toronto
Bank erosion damages in affected
watercourses
$850+ million in property damages
Impacts more widespread and
severe than Aug 4, 2009
July 8th Storm
17
IDF Curves Comparison for July 8, 2013,
and August 4, 2009 Events
Stations 1 10 100 1000 5 10 15 20 30 60 120 180 240 360 720 1440 Duration (min) In te n s it y ( m m /h r) 2 Year Storm 5 Year Storm 10 Year Storm 25 Year Storm 50 Year Storm 100 Year Storm Station 1 Station 5 Station 6 Station 6 - August 4, 2009 100 year July 8, 2103 August 4, 2009
Residential Flooding
Mississauga Valley Blvd at Lolita Gardens QEW & N. Service Road at Cooksville Ck
Paisley Blvd East Dixie Rd north of Lakeshore Rd
QUESTIONS
Future Directions
• Hydrometeorological Monitoring Network
– Gauge network will be operated in near real-time mode to provide rapid response to significant events. – Rainfall gauges will be operated year round
– Import of all historic metrological data into WISKI system
• Access of rainfall and other hydrometric data to municipal partners and various stakeholders in the watershed • Standardized data storage and retrieval system
– Rapid evaluation and response system to significant findings – Processing data as soon as possible (i.e. automatic QA/QC) – Weekly/monthly report
• Web-Pro integration
– Enable remote access to partner organizations
– Enhance flood forecasting communications available on CVC website
• Enhanced CVC’s flood forecasting and warning capabilities to assist municipal partners – Flood forecasting models
– GIS & IWMP monitoring integration • GIS & IWMP monitoring integration
