Flood Risk Assessment for Jigalong

Client:
Department of Planning – WA
location:
Jigalong, WA
overview

Jigalong is an remote community in the Pilbara. It is approximately 165 km east of Newman, in the Shire of East Pilbara. Jigalong is within the Nyiyaparli native title claim area. Jigalong Creek is immediately to the west of the community and a tributary of Jigalong Creek is immediately to the east.  The land adjoining the creeks is of high cultural significance.

Flood Risk Assessment

The Western Australia Department of Planning commissioned Water Technology to undertake a flood risk assessment of the Jigalong community. Water Technology completed the Flood Risk Assessment and Floodplain Management Strategy for the Jigalong Community, near Newman in the Pilbara.  This work was undertaken to provide information to the Department of Planning on the risk of flooding and associated hazards to property and infrastructure at Jigalong, and possible mitigation measures and development constraints.

Hydrologic and hydraulic modelling assessments.

A comprehensive hydrologic and hydraulic modelling assessment was undertaken which provided estimates of flood flows, levels, extents, depths, and hazard, and formed the basis for floodplain and design flood mapping.  The modelling revealed that Jigalong community is vulnerable to frequent, low hazard nuisance stormwater flooding, and less frequent but more severe flooding from Jigalong Creek and the tributary to the east of the community.  A floodplain management strategy was developed with the object of minimising flood risk and damage, including possible flood mitigation measures.

The scope of work required for this assessment involved a site survey and the development of a Digital Elevation Model (DEM), hydrological and hydraulic modelling, floodplain mapping, community consultation and the development of a floodplain development strategy including mitigation options assessment and develop-able land assessment.

The Jigalong Flood Risk Assessment was undertaken to provide the Department of Planning with flood mapping and information on flood behaviour to guide land use planning, emergency management and assessment of building and development in flood-prone areas for the Jigalong community.

Key Services Provided:

  • Catchment Hydrology – modelling and analysis
  • Hydraulic Modelling
  • Design Flood Mapping
  • Floodplain Management Strategy
  • Flood Risk Assessment
  • Stormwater Drainage Improvements and Recommendations

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