land drainage public meeting presentation 03092013
TRANSCRIPT
8/12/2019 Land Drainage Public Meeting Presentation 03092013
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Impacts of the Earthquakes on the
Flood Risks in the Dudley Catchment
Avon River 1852
• Brief catchment history
• The impacts of the earthquakes
•
The recent flooding• What are Council doing about it
• How you can help
• Questions
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Dudley Creek Timeline
1860’s
1940’s
1960’s
1970’s
1980’s
Earthquakes
12/13August2012
16/17June2013
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1860’s
1940’s
1960’s
1970’s
1980’s
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1980’s
Earthquakes
12/13August 2012
16/17June 2013
FlocktonAylesford
Area
Dudley Creek andShirley Stream (1856)
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1940’s
1960’s
1970’s
1980’s
Earthquakes
Flooding in Shirley (1945)
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1960’s
1970’s
1980’s
Earthquakes
12/13August 20
Floods (1968)
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1970’s
1980’s
Earthquakes
12/13August 2012
16/1June 20
Floods (1975)
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1980’s
Earthquakes
12/13August 2012
16/17June 2013
Archimedes Screw
for the Philpotts
Road Pumpstation
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Dudley Diversion Completed in 1989
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Earthquakes
12/13August 2012
16/17June 2013
Earthquakes have caused the
streams to narrow and silt up
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Earthquakes
12/13August 2012
16/17June 2013
Since the earthquakes culvertsare now even more of a
restriction to flood flows
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1980’s
Earthquakes
12/13August 2012
16/17June 2013
Shirley Road CulvertRoad and Driveway Crossings
0.2 0.4
0.4
0.5
The earthquakes have caused
widespread land settlement that
has made flood vulnerable
areas even more at risk.
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1980’s
Earthquakes
12/13August 2012
16/17June 2013
Shirley Road CulvertRoad and Driveway Crossings
0.2 0.4
0.4
0.5
Land SettlementPipe damage during the
earthquakes also add to the
problems.
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Pre-Earthquake 1 in 10 FloodLegend
Flooding Depths (m)
0.0 - 0.2
0.2 - 0.4
0.4 - 0.6
0.6+
Streams Modelled
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Post-Earthquake 1 in 10 Flood
FlocktonAylesford
Area
Hills RoadShops
Slater Street
EmmettStreet
QuinnsRoad
Stapletons
Road
LowerDudley
Legend
Flooding Depths (m)
0.0 - 0.2
0.2 - 0.4
0.4 - 0.6
0.6+
Streams Modelled
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Harrison StreetThornton Street
12/13August 2012
16/17June 2013
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Flockton Street
16/17June 2013
Stapletons Road
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Initial Response•On-going maintenance work to remove siltfrom the streams and drains
•350 truck loads of silt removed since June 2013
•Topographic survey of all stream channels andculverts
What are Council Doing?
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Catchment Wide Upgrades•The full solutions are complex and catchment
wide
•Council are investigating a wide range of
potential upgrades
What are Council Doing?
8/12/2019 Land Drainage Public Meeting Presentation 03092013
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Options Being Investigated
• Channel widening and deepening
• Culvert upgrades
• Stormwater pipe upgrades
• Storage
• Pumpstations
• House raising
• Bypass
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Short term
•Developing a heavy rainfall response plan
What are Council Doing?
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Response Plan
Early Warning
Preparation
Preventing
Damage
Cleaning Up
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• Make a plan for your household
• Raise valuables
• Please check on your neighbours before,
during, after a flood
What can you do?
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• www.ccc.govt.nz
Search “Floor Level”
http://maps.cera.govt.nz/advanced-viewer/?Viewer=Ccc-Floor-Levels
Floor Level Viewer