Northland Civil Defence Emergency Management Plan, 2010

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APPENDIX B – HAZARD SUMMARIESThe region’s hazards are profiled in this Appendix. The consequence and probability of each hazard occurring israted on a 1-5 basis, as described in the matrix below.Consequence of the risk occurring1 2 3 4 5Likelihood (that the risk will occur in next ten years) Insignificant Minor Moderate Major CatastrophicA: Almost Certain (more than 1:10 year probability) H H E E EB: Likely (probability between 10-90 year occurrence) M H H E EC: Possible: (probability between 100-500 year occurrence) L M H E ED: Unlikely: (probability between 500-2000 year occurrence) L L M H EE: Rare (> 2000 year event probability) L L M H HNorthland Civil Defence Emergency Management Plan, 2010-2015 Page 72
RIVER FLOODING ARISING FROM LOCALISED HEAVY RAINFALLOverviewRiver flooding as a result of sustained or short duration, high intensity rainfall (typicallythunderstorms) is the most frequent and widespread hazard throughout the region.Thunderstorms generally have their worst impact in a localised area less than 100sqkm.They are less predictable than larger weather fronts.The high flood risk in Northland arises from exposure to intense weather systems and atopography which sees rapid run-off from a steep terrain leading into flat areas whereflood waters recede slowly, exacerbated by tidal lower reaches. Flooding damage is oftenworsened by large amounts of silt and debris in the floodwaters and land slips are also afrequent consequence of rain in Northland.HazardLikelihood(A/B)HazardConsequence(3)How do wemanage therisk?What moreshould we bedoing?A storm with 12 hourly rainfalls in excess of 150 mm in a local area has an Annual ReturnPeriod of 100 years or more. Shorter duration, higher intensity rainfall can also causemajor flooding, such as Pungaru in 1999. Regionally the likelihood is higher as there is acumulative risk of storms in different areas.Social: Distress due to displacement of people (in a localised area, but possibly for extendedperiods) and loss of possessions. Extreme events may result in injury or loss of life. Psychological problems for victims reliving or recalling events. Public health risk from water/sewage contamination. Loss of irreplaceable, significant Maori land holdings, taonga and waahi tapu sites.Built: Significant loss of infrastructure, particularly roads and bridges due to landslips,flooding and bridge pier scouring. Power, water supplies and communication systemscan also be affected if landslips or flooding impact on critical facilities, but generallyare affected less than the road network unless the rain is accompanied by high winds.Economic: Loss of crops (floodplains are a major contributor to primary production). Cost of restoration (flood insurance increasingly difficult to obtain in some areas).Natural: Alterations to river channels; bank erosion, channel scour/build-up/diversion. Sediment-debris deposition, and dispersal of chemicals, effluents (dairy farm ponds,septic tanks, town sewage networks) and rubbish (from tips) across floodplains.River Management Policy and agreements between the four councils.Land planning/building standards.River flood mitigation schemes and Whangarei and Kaitaia City Flood Control Schemes.Flood forecasting systems for Kemp House, Kerikeri (Historic Places Trust) and Kaitaia.NIWA weather models and rain forecasting.Evacuation / community plans in place for some high-risk areas.Development of flood management plans for high priority catchments.Development of community response plans for at-risk communities.Improvements to rain and flood forecasting/warning systems.Improved linkages with planning departments to prevent building in at-risk areas.What is thefuture risk?Expected to be increasing high intensity rainfall events with climate change.Community exposure may decrease as land planning improves, but also increasingpopulation density may counteract that.Northland Civil Defence Emergency Management Plan, 2010-2015 Page 73
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PLAN STRUCTURESection1:Introduction
Page 5 and 6:
GLOSSARY OF TERMSCommonly used term
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SUMMARYThe Northland Civil Defence
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1 INTRODUCTIONSection 1 outlines th
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1.3 THE PLAN CONTEXT1.3.1 CORE PRIN
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1.4.1 NORTHLAND CDEM GROUP VISION A
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1.4.3 HOW THIS PLAN SUPPORTS NATION
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Whangarei District population risin
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2.1.3 ECONOMIC ENVIRONMENTPROFILETh
Page 21 and 22: 2.2 CDEM GROUP HAZARDSCAPE2.2.1 ANA
Page 23 and 24: Figure 12: River Network in Northla
Page 25 and 26: 2.3 HAZARD RISK PRIORITIES2.3.1 THE
Page 28 and 29: 3 RISK REDUCTIONThis section provid
Page 30 and 31: In 2009, NRC published a review of
Page 32 and 33: 4 READINESSThis section provides an
Page 34 and 35: 4.2 COMMUNITY READINESS4.2.1 AWAREN
Page 36 and 37: 4.3 GROUP READINESS: STAFF CAPACITY
Page 38 and 39: 2. To facilitate communication betw
Page 40 and 41: Other OrganisationPlans(refer Appen
Page 42 and 43: OBJECTIVE 3d:Current Status:Methodo
Page 44 and 45: In terms of effort applied to respo
Page 46 and 47: 5.3 CDEM EMERGENCY OPERATING CENTRE
Page 48 and 49: Welfare Centres can also be set up
Page 50 and 51: Table 9: Specific Response Issues a
Page 52 and 53: audience. The information it provid
Page 54 and 55: 6 RECOVERYThis section sets out the
Page 56 and 57: The role of the Group Recovery Mana
Page 58 and 59: 7 MONITORING AND EVALUATIONThis sec
Page 60 and 61: CommunityEducation /ParticipationCD
Page 62 and 63: 8 MANAGEMENT AND GOVERNANCEThis sec
Page 64 and 65: The functions of the Group are deta
Page 66 and 67: 8.3.3 WORK PROGRAMMESAn annual work
Page 68 and 69: During a declared emergency (Level
Page 70 and 71: APPENDIX A - ORGANISATIONS WITH A K
Page 74 and 75: WIDESPREAD HEAVY STORMSOverviewHaza
Page 76 and 77: VOLCANOOverviewHazardLikelihood (E)
Page 78 and 79: Figure 20: Historical Earthquake Lo
Page 80 and 81: DROUGHTSOverviewA drought can be de
Page 82 and 83: Table 13: Infrastructure Failure Sc
Page 84 and 85: MAJOR TRANSPORT ACCIDENTOverviewHaz
Page 86: ANIMAL / PLANT DISEASE AND PESTSOve
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Northland Civil Defence Emergency Management Plan, 2010

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