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Rees-Dart Riv iver management: resilience and adaptation Rees-Dart - - PowerPoint PPT Presentation
Rees-Dart Riv iver management: resilience and adaptation Rees-Dart - - PowerPoint PPT Presentation
Rees-Dart Riv iver management: resilience and adaptation Rees-Dart natu tural l hazards Lake Flo La loodin ing Flooding of Lake Wakatipu 1957, 311.6 m (Hocken snapshop image) Rees-Dart delt lta growth th Looking towards Glenorchy from
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Flooding of Lake Wakatipu 1957, 311.6 m (Hocken snapshop image)
La Lake Flo loodin ing
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Rees-Dart delt lta growth th
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Looking towards Glenorchy from Kinloch, Wetland at Kinloch ca 1875 (Hocken Snapshop)
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Google Earth imagery, 2018
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Full floodplain width Engineered channel narrow,
- utflanked easily
Rees s - past management
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Incomplete set of groynes
Proposed groyne ext xtensio ion
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Feb 2016 May 2018 Dart erosion repair ir work
Diversion of main channel away from TR bank
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Feb 2016 May 2018
Photo: Geoffrey Thomson June 2018
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A B
Floodbank Road
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Road Flood plain very similar elevation to river bed. All part of growing delta Bank Riverbank erosion DR_3
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- Addressing im
immedia iate erosion, safer roads
- Repair of crit
itic ical l flo loodbanks and groynes
- Responsive riv
iver management as needs aris ise
- Defin
ine key iss issues for r lo longer r term rm pla lan ORC –pla lan for r next xt 3 years ➢ Ba Bala lancin ing touri rism needs: je jet t boats, preserv rvin ing wetl tlands, , im improvin ing roadin ing and in infr frastructure ➢ Allowing room for the river, ‘soft’ management ➢ Ca Cannot protect again inst delt lta growth th ind indefi finit itely ly ➢ Cli limate change: : proje jected in increasin ing rain infall ll on the divid ivide, flo lood heig ight and fr frequency ➢ What is ‘critical’ for local/district/regional rate base?
Years 2-3 Every year
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- Addressing im
immedia iate erosion, safer roads
- Repair of crit
itic ical l flo loodbanks and groynes
- Responsive riv
iver management as needs aris ise
- Defin
ine key iss issues for r lo longer r term rm pla lan ORC –pla lan for r next xt 3 years
Response Reduction Readiness Recovery
➢ Ba Bala lancin ing touri rism needs: je jet t boats, preserv rvin ing wetl tlands, , im improvin ing roadin ing and in infr frastructure ➢ Allowing room for the river, ‘soft’ management ➢ Ca Cannot protect again inst delt lta growth th ind indefi finit itely ly ➢ Cli limate change: : proje jected in increasin ing rain infall ll on the divid ivide, flo lood heig ight and fr frequency ➢ What is ‘critical’ for local/district/regional rate base?
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- Addressing im
immedia iate erosion, safer roads
- Repair of crit
itic ical l flo loodbanks and groynes
- Responsive riv
iver management as needs aris ise
- Defin
ine key iss issues for r lo longer r term rm pla lan ORC –pla lan for r next xt 3 years
Response Reduction Readiness Recovery
➢ Ba Bala lancin ing touri rism needs: je jet t boats, preserv rvin ing wetl tlands, , im improvin ing roadin ing and in infr frastructure ➢ Allowing room for the river, ‘soft’ management ➢ Ca Cannot protect again inst delt lta growth th ind indefi finit itely ly ➢ Cli limate change: : proje jected in increasin ing rain infall ll on the divid ivide, flo lood heig ight and fr frequency ➢ What is ‘critical’ for local/district/regional rate base?
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Example le of f optio tions for r Dart Riv iver r erosio sion (n (not t an actu tual l cost-benefi fit analy lysis is)
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Extr xtra slid lides
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