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Risk Assessment COASTAL RESILIENCE TOOLKIT (CRT)

Definition. This step assesses the level of coastal risk according to 3 risk intervals (high, medium, low) The risk is calculated by determining , in order, the hazard index, vulnerability index, capacity index, and finally the risk index itself.

Method. The calculation of the coastal risk is based on the calculation method in Peraturan Kepala BNPB Nomor 02 Tahun 2012 tentang Pedoman Umum Pengkajian Risiko Bencana.(See page 1)

Sub steps.

  • Hazard and coastal damage types. Identify the hazard type(s) (tsunami, extreme sea wave and abrasion) and enter each hazard type into the Hazard Index according to its constituent indicators.Then identify the related coastal damage type(s) (12 types, Annex 3) and the corresponding damage level.
  • Coastal hazard projections. Calculate sea behaviour related hazards based on existing and projected conditions.
  • Vulnerability Indexes. Vulnerability index consists of Social, Economic, Physical and Ecological Indexes. These indexes need to be calculated based on the specific characteristics of the coastal damage type which means that each type of coastal damage shall have its own vulnerability index.
  • Social Vulnerability Index consists of indicators for i) population density, ii) sex ratio, iii) poverty ratio, iv) disabled group ratio and v) age group ratio. Ratio i-v and Hazard Index creates the location-specific Population Exposure Index
  • Economic Vulnerability Index consists of indicators for i) productive land size (paddy field, plantation, agriculture land and fish pond) and ii) gross regional domestic product (GRDP)
  • Physical Vulnerability Index consists of indicators for i) houses (permanent, semi-permanent, non-permanent), ii) public facilities and iii) critical facilities.
  • Ecological Vulnerability Index consists of indicators for land cover: i) conservation forest, ii) mangrove, iii) swamp, and iv) bushes.
  • Economic Vulnerability Index, Physical Index and Ecological Index altogether with Hazard Index compose the Loss Index.
    • . Capacity Index. There are 5 components/indicators which need to be calculated:i) prevalence of regulations and disaster mitigation institutions, ii) availability of early warning and Kajian Risiko Bencana (Disaster Risk Study), iii) level/state of education on disaster knowledge,iv) evidence of prior reduction of basic risk factors , v) disaster preparedness in all levels.
    • Risk Index. The Risk Index is calculated according to the following formula:Remarks for CRT utilisation in Indonesia.

      Following applicable regulations and practice, all scientific data which is required in sub step 1.1 – 1.5 should be prepared by authorised institutions. The Regency’s/Municipality’s Disaster Management Authority (BPBD) shall