2021-01-18 GC - Item 3 - Attachment 2 - Phase 7 Project Summary Coastal Hazards Adaptation Plan

 Noosa Shire Council Coastal Hazard Adaptation Plan: Project Summary                                                8
 Methodology




2.2.4    Phase 5: Risk Assessment
         A risk management approach was applied to assessing coastal hazards and future management, as
         required by the QCoast2100 Guidelines. The Australian Standard for identifying and managing risks is
         outlined in ASNZS ISO 31000:2018 Standard Risk Management Principles and Guidelines. The use
         of a risk-based approach to managing coastal hazards is a requirement of most state guidelines in
         Australia and accords with current international best practice for natural resource management.
         Council staff, key stakeholders and community members were involved in determining appropriate
         risk assessment criteria and scoring identified risks.

         Risk criteria and assessment frameworks were based on Noosa’s current risk assessment
         framework, with input from stakeholders sought during a number of engagement activities.

         The scenarios in Table 2-3 were assessed as part of the risk assessment.

         Table 2-4 to 2-4 describe the risk criteria adopted for the Noosa CHAP.

         Asset risks that were considered High or Very High are considered Intolerable and subject to further
         assessment.

                                        Table 2-3     Hazard Scenarios assessed

          Hazard                               Planning Horizon/Event
          Erosion                              Present Day
                                               2040
                                               2070
                                               2100
          Storm tide inundation                Present Day (1 in 20yr, 1 in 100yr and 1 in 500yr Annual
                                               Recurrence Intervals*)
                                               2040 (1 in 20yr, 1 in 100yr and 1 in 500yr Annual
                                               Recurrence Intervals)
                                               2070 (1 in 20yr, 1 in 100yr and 1 in 500yr Annual
                                               Recurrence Intervals)
                                               2100 (1 in 20yr, 1 in 100yr and 1 in 500yr Annual
                                               Recurrence Intervals)
          Permanent Sea Level Rise             2040
                                               2070
                                               2100
         * Annual Recurrence Interval is a way of explaining how frequent an event is, by comparing how often the event
         has occurred in the past - once in every 20 years, once in every 100 years or once in every 500 years. A 1 in
         500yrs event is considered very rare.