Bin 2.3 Heavy rainfall induced landslides

Will the risk of rainfall-induced lanslides change?

The Tools in Bin 2.3 provide background on rainfall-induced landslide processes and demonstrate a method of estimating future landslide risk. 

Tool 2.3: Overview of landslide tools

(PDF 290 KB)

  • A brief overview of Tools 2.3.1 to 2.3.5. 

Tool 2.3.1: General information on the causes of rainfall-induced landslides

(PDF 483 KB)

  • A general introduction to the causes of rainfall-induced landslides. 

Tool 2.3.2: Collection and analysis of historical landslide information and data

(PDF 798 KB)

  • Describes in generic terms the datasets needed to calculate the probability of a rainstorm-induced landslide occurring at any point in New Zealand and the specific datasets used for a study in Wellington to assess the rainfall-induced landslide hazard. 

Tool 2.3.3: Modelling present-day and future landslide potential

(PDF 650 KB)

  • Describes a generic methodology that can be used to calculate the probability of a rainstorm-induced landslide occurring at any point in New Zealand.

Tool 2.3.4: Mapping the landslide hazard

(PDF 4.2 MB)

  • Presents the results of applying the Probabilistic Rainfall-Induced Landslide Hazard Model (PRILHM) methodology described in [Tool 2.3.3] to produce hazard maps for a range of rainfall conditions.

Tool 2.3.5: Linkages to risk assessment, adaptation options and decision tools 

(PDF 340 KB)

  • This tool identifies the next stages in an assessment of rainfall-induced landslide impacts due to climate change. 
A hillside that gave way spewed rocks, mud and gravel into holiday houses at the fishing village of Ngawi in 2008 (Source: stuff.co.nz).