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                                      16
Methodology




                               Figure 2-3    Conceptual Model for Noosaville CBA

2.2.6.1 Eastern Beaches
        A total of seven different mitigation options were explored:

        • Option 1 (Base case): no adaptation actions undertaken

        • Option 2: Dune revegetation and management

        • Option 3: Dune revegetation, augmentation and management

        • Option 4: Construction of seawalls in high risk locations

        • Option 5: Acquisition of properties affected by coastal erosion in 2070, and conversion of affected
          properties to public open spaces

        • Option 6: Option 5 with a 15-year leaseback of properties prior to conversion to public open
           spaces

        • Option 7: Changes to planning regulations to prevent development seaward of the 2070 coastal
          erosion line.

        The socio-economic analysis investigated the effects of coastal erosion between 2020 and 2100.

2.2.6.2 Noosaville
        • The CBA for Noosaville investigated mitigation options for rising sea levels between 2020 and
          2100. Two options were explored: Option 1: Protect - Levees and stormwater infrastructure
           modifications (i.e. installing tide gates to prevent egress into the stormwater network)

        • Option 2: Accommodate - Road raising.