Flood Risk and Vulnerability Analysis Project - Atlantic Climate ...

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4.1.2 Topographic Map Base ........................................................................................ 95 4.1.3 Analytical Methods ............................................................................................... 95 4.1.4 Software ............................................................................................................... 96 4.1.5 Climate Change ................................................................................................... 97 4.1.6 Community Location and Linkage with Other Datasets ....................................... 98 4.1.7 Population .......................................................................................................... 100 4.1.8 Flood History ...................................................................................................... 101 4.1.9 Flood Damages Estimates ................................................................................. 101 4.1.10 Watershed Runoff Potential ............................................................................... 101 4.1.11 Watercourse Hydraulics ..................................................................................... 103 4.2 Prioritization Analysis ...................................................................................................... 104 4.3 Recommendations for Assessing the Need for New / Updated Flood Risk Mapping .......................................................................................................................... 108 5. TASK E – ASSESS NEED FOR FLOOD FORECASTING / FLOOD WARNING SYSTEM ...... 110 5.1 Data Sources .................................................................................................................. 110 5.2 Methods .......................................................................................................................... 111 5.3 Identify key communities from the Flood Events Inventory ............................................ 111 5.4 Review and Assess Physical Hazard.............................................................................. 113 5.4.1 Community Vulnerability to Direct Impacts of Flooding ..................................... 117 5.4.2 Community Vulnerability to Indirect Flooding Impacts and Isolation ................. 118 5.5 Results ............................................................................................................................ 120 5.5.1 Identified key communities ................................................................................. 120 5.5.2 Community Exposure to Physical Hazard ......................................................... 121 5.5.3 Community Vulnerability to Direct Impacts of Flooding ..................................... 122 5.5.4 Community Vulnerability to Indirect Flooding Impacts or Isolation .................... 124 5.6 Results of Assessment and Conclusion.......................................................................... 125 5.7 Recommendations for Assessing the Need for Flood Forecasting / Flood Warning Systems ............................................................................................................ 128 6. TASK F – IDENTIFY FLOOD VULNERABILITY MITIGATION AND ADAPTATION STRATEGIES .............................................................................................................................. 130 6.1 Community Analysis........................................................................................................ 130 6.1.1 Newfoundland Regions and Sub-regions .......................................................... 131 6.1.2 General Characterizations of Sub-regions ......................................................... 134 6.1.3 Summary of Sub-region Characteristics ............................................................ 139 6.2 Mitigation Strategies........................................................................................................ 141 6.2.1 Structural and Non-Structural Strategies ........................................................... 142 6.2.2 Potential Strategies ............................................................................................ 143 6.3 Mitigation Recommendations .......................................................................................... 145 6.3.1 Strategies Applicable to All Communities .......................................................... 145 6.3.2 Property Acquisition ........................................................................................... 146 6.3.3 Strategies Applicable to Specific Sub-regions ................................................... 147 6.3.4 Mitigation Strategy Cost and Potential Benefits ................................................. 150 6.3.5 Sub-regions Prioritization Considerations .......................................................... 152 6.4 Recommendations .......................................................................................................... 154 7. REFERENCES ............................................................................................................................. 156 7.1 Flood Events Inventory References ................................................................................ 156 7.2 Climate Change References ........................................................................................... 156 TA1112733 xv
7.3 References for Assess Need for New/Updated Flood Risk Mapping ............................. 158 7.4 References for Assess Need for Flood Forecasting / Flood Warning System ............... 158 8. APPENDIX A - PRIORITIZATION OF COMMUNITIES FOR NEW FLOOD PLAIN MAPPING .................................................................................................................................... 160 9. APPENDIX B SUB-REGION COMMUNITIES ............................................................................ 168 10. APPENDIX C FLOOD INVENTORY REPORT ........................................................................... 174 11. APPENDIX D IDF CURVES REPORT ........................................................................................ 176 12. APPENDIX E WATERSHED TOPOGRAPHY MAPS ................................................................. 178 13. APPENDIX F WATERSHED LAND COVER MAPS ................................................................... 180 TA1112733 xvi
Page 1 and 2: Atlantic Climate Adaptation Solutio
Page 3 and 4: GOVERNMENT OF NEWFOUNDLAND AND LABR
Page 5 and 6: June 13, 2012 AMEC Project #TA11127
Page 7 and 8: EXECUTIVE SUMMARY The Government of
Page 9 and 10: Assessing the Need for New or Updat
Page 11 and 12: SUMMARY The Government of Newfoundl
Page 13 and 14: Land Use Change A pre-cursor effort
Page 15 and 16: fresh water from the Arctic south a
Page 17 and 18: watershed, which appears to already
Page 19 and 20: RECOMMENDATION SUMMARY Infrastructu
Page 21 and 22: 7. It is recommended that WRMD deve
Page 23: TABLE OF CONTENTS PAGE EXECUTIVE SU
Page 27 and 28: LIST OF TABLES Table 2-1. Flood Eve
Page 29 and 30: LIST OF FIGURES Figure 2-1. Water R
Page 31 and 32: 1. OVERVIEW In the 1980‟s, under
Page 33 and 34: Floodway Floodway Fringe Climate Ch
Page 35 and 36: 2. Task B - Updated Flood Events In
Page 37 and 38: Management Framework for Canada def
Page 39 and 40: The „Types of Events‟ field is
Page 41 and 42: Field Damage Estimate by Community
Page 43 and 44: Arrangements 10 (DFAA) damage estim
Page 45 and 46: Storm # General Location Year Seaso
Page 47 and 48: 2.3.2 Weather Events - Annual Occur
Page 49 and 50: Figure 2-6. Storm Occurrence by Yea
Page 51 and 52: Figure 2-8. Storm Occurrence by Mon
Page 53 and 54: Type of Event (Grouped) % Occurrenc
Page 55 and 56: Figure 2-11. Flood Occurrence by Se
Page 57 and 58: Coastal Flooding Coastal Flooding a
Page 59 and 60: September is associated, presently,
Page 61 and 62: 3. Task C - Assess Existing Flood R
Page 63 and 64: Gaudon‟s Brook / Cold Brook Steph
Page 65 and 66: 3.3.2.1 Community Flood Watersheds
Page 67 and 68: 3.3.2.3 Earth Observation for Susta
Page 69 and 70: Figure 3-3. Graphical model of land
Page 71 and 72: Original EOSD Classes Shadow Water
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Watershed Community Total Area Fore
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correct). Of the 90 accuracy assess
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Figure 3-6. GCM sectors selected to
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Figure 3-7. Percentage change of pr
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The results for temperature are sim
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Area Labrador West Central East Sum
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West sees slightly larger winter in
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These increases, though slight, in
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Classification Maximum Sustained Su
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Since air flow around high pressure
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10 9 8 7 6 Total Number of Tropical
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One of the reasons for this increas
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Figure 3-19. Frequency of Named Sto
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Figure 3-21. Change in Mean Sea Lev
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The net long term sea level effect
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Southern Oscillation (ENSO). The AM
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middle of North America as it would
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e a higher incidence of tropical st
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extreme will be considered. Areas t
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Storms weaken rapidly once they mak
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Figure 3-27. Selected Hurricane and
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o o a Category 2 Hurricane making l
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o Because winter temperatures show
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Worst Case Scenarios This section
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5. A hurricane making landfall on t
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Standards Association 21 recommends
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WRMD has defined a preference for h
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The hydrographic network was used t
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4.1.8 Flood History Identification
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Watershed Slope The slope attribute
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such as number of flood events at a
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Deer Lake Placentia Codroy Steady B
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TA1112733 page 109
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5.2 Methods The methodology used fo
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Reported Event Damages Storm# Locat
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Given the reported damages resultin
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Figure 5-3. Storm tracks for select
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natural constrictions. The number a
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5.5.2 Community Exposure to Physica
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Community Number of Events 2011 Pop
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Community Access Notes Confinement
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Brook and Deer Lake are both locate
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Warning Systems 1. It is recommende
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source of flood vulnerabilities com
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Figure 6-2. Newfoundland Digital El
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communities ( Gillams, Hughes Brook
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Sub-region Precipitation Climate Ch
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Analysis of the socio-economic data
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East-2 Coastal communities line nea
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6.2.2 Potential Strategies Table 6-
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6.3 Mitigation Recommendations Base
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Table 6-5 presents the range of ave
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West-3, West-4, and Central-3 These
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Mitigation Strategy Cost to Impleme
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Sub-region Watershed Characteristic
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TA1112733 page 155
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Music and Caya, 2007 Richter and Ba
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http://www.arcgis.com/home/item.htm
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Rank Community Name LGP# 82 Massey
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Rank Community Name LGP# 252 Little
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Rank Community Name LGP# 423 Thornl
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TA1112733 page 167
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FOX ISLAND RIVER-POINT GALLANTS GEO
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GEORGE'S BROOK-MILTON GOOBIES GRAND
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TA1112733 page 173
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Flood # Storm # General Location St
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11. Appendix D IDF Curves Report TA
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Development of Projected Intensity-
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Storm Duration Development of Proje
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1979 1983 1987 1991 1995 1999 2003
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Mean Annual Total Precipoitation, m
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Storm Duration Storm Duration Devel
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Storm Duration Storm Duration Storm
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Codroy Valley Watershed Topography
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Parson's Pond Watershed Topography
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Rushoon Watershed: Topography Eleva
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Eastern Watersheds, East Topography
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Eastern 54°0'0"Watersheds, West To
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Central Watersheds, 57°0'0"W East
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Central 58°0'0"W and Western Water
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Badger and Rushy 58°0'0"W Pond Wat
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Cox's Cove Watershed: Land Cover 58
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Ferryland Watershed Land Cover 60°
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49°0'0"N Glenwood-Appleton 56°0'0
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Parson's Pond Watershed: Land Cover
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Rushy Pond Watershed: 57°0'0"WLand
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Stephenville Crossing Watershed: La
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Whitbourne and Brigus Watersheds: L
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Eastern Watersheds 2: Land Cover Ha
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Eastern Watersheds, East: Land Cove
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