iclr webex: the role of groundwater in flooding (september 24, 2014)
DESCRIPTION
On September 24, 2014, the Institute for Catastrophic Loss Reduction held a workshop entitled 'The role of groundwater in flooding' with Cathy Ryan from the University of Calgary. Cathy Ryan is a Professor in Geoscience at the University of Calgary who is trained as a geotechnical engineer and hydrogeologist. She has been researching groundwater/river interaction river-connected alluvial aquifers in the Calgary region for more than a decade. Her interest in the role of groundwater in flooding was sparked after the 2005 Calgary floods when anecdotal information collected in a door-to-door survey of residents in neighbourhoods around Calgary's Elbow River suggested groundwater inundation (as opposed to overland flooding) caused a significant amount of the economic damage to homes. It is Dr. Ryan's view that groundwater flooding is under-recognized but can be easily monitored and understood.TRANSCRIPT
![Page 1: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/1.jpg)
The Role of Groundwater in Flooding
Cathy Ryan
Professor, P.Eng., P.Geol.
ICLR, Toronto September 24, 2014
Geoscience, Faculty of Science
![Page 2: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/2.jpg)
• River flooding and prediction
• Flood mapping in Calgary
• Groundwater and monitoring wells
• Groundwater flooding in Calgary
• Summary comments
![Page 3: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/3.jpg)
Acknowledgements:
Geoscience, University of Calgary
Dr. Jerry Osborn Jason Abboud Wageningen University
Jasper Candel Adriaan de Bourgraaf City of Calgary
Jonathan Slaney Frank Frigo
![Page 4: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/4.jpg)
![Page 5: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/5.jpg)
www.ctvnews.ca
4th St. SW
![Page 6: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/6.jpg)
www.ctvnews.ca
![Page 7: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/7.jpg)
www.windsorstar.com/news/Gallery+stunning+photos+from+flooded+Calgary/9218651/story.html
![Page 8: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/8.jpg)
![Page 9: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/9.jpg)
![Page 10: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/10.jpg)
![Page 11: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/11.jpg)
![Page 12: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/12.jpg)
Past Flood Events – Bow @ Calgary
![Page 13: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/13.jpg)
1897, South bank of Bow River
![Page 14: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/14.jpg)
1915, old Center St. Bridge
![Page 15: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/15.jpg)
www.rightnow.io/breaking-news/waterton-abstorm-waterton-lakes-national-park_bn_1371688987055.html
1929
![Page 16: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/16.jpg)
1932: Memorial Drive
![Page 17: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/17.jpg)
1932: Sunnyside
![Page 18: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/18.jpg)
Alberta Environment, Calgary Floodplain Study, 1983
![Page 19: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/19.jpg)
![Page 20: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/20.jpg)
Past Flood Events – Bow @ Calgary
![Page 21: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/21.jpg)
• River flooding and prediction
• Flood mapping in Calgary
• Groundwater and monitoring wells
• Groundwater flooding in Calgary
• Summary comments
![Page 22: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/22.jpg)
![Page 23: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/23.jpg)
![Page 24: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/24.jpg)
![Page 25: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/25.jpg)
To my knowledge, no river flooding maps consider groundwater
![Page 26: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/26.jpg)
Flood maps and…. Groundwater Resources in the Calgary Area (Meyboom, 1961)
www.sustainablecalgary.ca
![Page 27: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/27.jpg)
Typical vertical cross-section
Cantafio, 2012
![Page 28: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/28.jpg)
Alluvial aquifers
alluvial aquifer bedrock (not very permeable)
glacial till
• river-deposited, under and beside river
• highly permeable (esp. in upper reaches) ‘lattice-like’; stream insects found up to 2 km away from river (Ward and Stanford, 1988)
• can be effectively mapped using air photo interpretation
up to several kilometers wide
![Page 29: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/29.jpg)
1915, old Center St. Bridge
![Page 30: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/30.jpg)
Escarpment beside alluvial aquifer
![Page 31: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/31.jpg)
Escarpment beside alluvial aquifer
Carrie P.
![Page 32: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/32.jpg)
Elbow River
No
se Creek
![Page 33: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/33.jpg)
Alberta flood mapping Flood Hazard Area: The flood hazard area is typically divided into floodway and flood fringe zones and may also include areas of overland flow. Floodway: The portion of the flood hazard area where flows are deepest, fastest and most destructive. The floodway typically includes the main channel of a stream and a portion of the adjacent overbank area. New development is discouraged in the floodway. Flood Fringe: The portion of the flood hazard area outside of the floodway. Water in the flood fringe is generally shallower and flows more slowly than in the floodway. New development in the flood fringe may be permitted in some communities and should be flood proofed. Overland Flow: Areas of overland flow are part of the flood hazard area outside of the floodway, and are typically considered special areas of the flood fringe.
![Page 34: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/34.jpg)
Alberta flood mapping
Groundwater Flood Hazard Area: Region where basement flooding by groundwater inundation is likely to occur.
Flood Hazard Area: The flood hazard area is typically divided into floodway and flood fringe zones and may also include areas of overland flow. Floodway: The portion of the flood hazard area where flows are deepest, fastest and most destructive. The floodway typically includes the main channel of a stream and a portion of the adjacent overbank area. New development is discouraged in the floodway. Flood Fringe: The portion of the flood hazard area outside of the floodway. Water in the flood fringe is generally shallower and flows more slowly than in the floodway. New development in the flood fringe may be permitted in some communities and should be flood proofed. Overland Flow: Areas of overland flow are part of the flood hazard area outside of the floodway, and are typically considered special areas of the flood fringe.
We need a new Area:
![Page 35: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/35.jpg)
Alberta flood mapping
![Page 36: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/36.jpg)
Alberta flood mapping
![Page 37: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/37.jpg)
• River flooding and prediction
• Flood mapping in Calgary
• Groundwater and monitoring wells
• Groundwater flooding in Calgary
• Summary comments
![Page 38: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/38.jpg)
Groundwater is water in the ‘saturated zone’ under the ground surface
![Page 39: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/39.jpg)
![Page 40: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/40.jpg)
14-40
Individual drive-point or drilled monitoring wells
Screened intervals
Well Cluster
Groundwater monitoring wells – tools of the trade
![Page 41: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/41.jpg)
Wat
er le
vel i
n m
on
ito
rin
g w
ell
Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
Groundwater level monitoring
![Page 42: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/42.jpg)
What if we had groundwater monitoring wells in flooded areas?
![Page 43: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/43.jpg)
What if we had groundwater monitoring wells in flooded areas?
![Page 44: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/44.jpg)
• River flooding and prediction
• Flood mapping in Calgary
• Groundwater and monitoring wells
• Groundwater flooding in Calgary
• Summary comments
![Page 45: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/45.jpg)
Roxboro
Rideau
Downtown Calgary
![Page 46: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/46.jpg)
C. Greene, A. Roome-Sandrin, T. Simieritsch, M. Towey
![Page 47: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/47.jpg)
Flood 2005 – lessons learned
• Overland flow only accounted for 17% of the total damage reported by residents
• Underground seepage (not overland flow) responsible for most of flood damage
• Setback only moderately appropriate for minimizing damage
• Ground elevation was as predictive of damage as distance from river/floodway
ENSC502 class, 2006
![Page 48: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/48.jpg)
A better approach to regulation?
ENSC502 class, 2006
• Regulate basement depths with respect to river stage and water table elevation
• consider zoning areas based on basement elevation above the 1:100 year river stage (and groundwater level)
![Page 49: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/49.jpg)
Flooding in Redwood Meadows (ENSC501 2013)
Redwood Meadows
![Page 50: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/50.jpg)
http://www.redwoodmeadows.ab.ca/rwm-flood-2013/
![Page 51: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/51.jpg)
http://www.redwoodmeadows.ab.ca/rwm-flood-2013/
![Page 52: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/52.jpg)
ENSC501 Field School II, 2013 co-researchers
N. Chin, A. Chung, L. D'Silva, M. DeCock, D. Doerksen, R. Donais, T. Fairfield-Bilyk, A. Grant, P. Jones, S. Karim, A. Kerford, A. Klein, J. Kolodziej, E. Kordich M. Kovacs, L. Laframboise, G. Lam, B. Linaker, R. Lorimer, A. Ma, K. McGeary, K. Moreira, S. Muminovic, T. Paradis, G. Perepelkin, A. Pulwicki, T. Rajabi, M. Revay, N. Rider, S. Ross, J. Sekhon, A. Smillie, S. Spaho, K.Stuart, K. Sutcliffe, M. Tang, E. Timmins, E. Webb, L. Wonneck and N. Taube, H. Jabusch
![Page 53: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/53.jpg)
Provincial flood maps
ENSC501 class, 2014
Townsite of Redwood Meadows
![Page 54: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/54.jpg)
Flooding in RWM homes
0
5
10
15
20
25
Nu
mb
er o
f re
spo
nse
s
Characteristics of the water that entered the house?
Clear
Dark
Odourous
Non-Odourous
Other
ENSC501 class, 2014
![Page 55: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/55.jpg)
0
2
4
6
8
10
12
14
Nu
mb
er o
f re
spo
nse
s
Where do you suspect water first entered your house
Sump pump
Floordrain
Foundation andcracks
Others
Flooding in RWM homes
ENSC501 class, 2014
![Page 56: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/56.jpg)
Flooding in RWM homes
ENSC501 class, 2014
![Page 57: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/57.jpg)
Flooding in RWM homes
ENSC501 class, 2014
![Page 58: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/58.jpg)
How far back would high groundwater levels propagate?
![Page 59: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/59.jpg)
Jan Feb Mar Apr May June Jul Aug Sept Oct Nov Dec
Simulated propagation of high river stage into alluvial aquifer
1.25 m
0.6 m
Candel et al., unpublished
![Page 60: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/60.jpg)
Water level responses in alluvial aquifer
Role of paleo-channels?
![Page 61: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/61.jpg)
Figure 6.15 Groundwater flood risk map of Calgary, including the surface flooding zone which has been calculated
by the City of Calgary. Model 1 is the Camp Gardner model, model 2 is the Sue Higgins Park model.
Groundwater flooded areas
Groundwater flood risk map of Calgary, including the surface flooding zone (provided by the City of Calgary). Candel et al., unpublished data
![Page 62: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/62.jpg)
Role of paleochannels in gw flooding?
Tonina and Buffington, 2009.
![Page 63: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/63.jpg)
Ongoing work @ UC
• Door-to-door survey of more than 300
residents affected by 2013 flood
• Environmental geophysics to understand
variations in alluvial aquifer
• Identification and monitoring of
groundwater monitoring wells to calibrate groundwater model
![Page 64: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/64.jpg)
• River flooding and prediction
• Flood mapping in Calgary
• Groundwater and monitoring wells
• Groundwater flooding in Calgary
• Summary comments
![Page 65: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/65.jpg)
Differentiating between ‘groundwater flooding’ and sewage backup?
ICLR, 2009
![Page 66: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/66.jpg)
How does groundwater enter homes most easily?
ICLR, 200
![Page 67: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/67.jpg)
What does the scientific literature say?
“Groundwater flooding is poorly understood, often confused with surface water flooding, and has not been widely recognized as a problem, either in the UK or internationally.”
Hughes et al., 2011
![Page 68: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/68.jpg)
![Page 69: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/69.jpg)
![Page 70: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/70.jpg)
Calgary Grade 2 student questions to Dr. Jerry Osborn
• Should we have built on the floodplain?
• Should we continue to build on it?
---St. Stephen School
• Should we rebuild places like High River or should people not live there?
---St. Albert School
![Page 71: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/71.jpg)
What could the insurance industry do to identify groundwater flooding?
• Strategic groundwater investigation and water level monitoring
• Validated groundwater modelling
• Consider basement floor elevation with respect to river stage elevation
![Page 72: ICLR Webex: The role of groundwater in flooding (September 24, 2014)](https://reader031.vdocument.in/reader031/viewer/2022020306/547e4ed0b4af9fc9158b5663/html5/thumbnails/72.jpg)
Conclusions • gw inundation can
significant
• basement floor elevation w.r.t river state is relevant
• can “look like” sewer back-up
• paleo-channels might be important
• Field investigation, gw monitoring wells needed