Greenvale Flood Study

This major flood study included the following:

Review and collate existing information and findings from previous reports and studies relating to hydrology, and flooding on and within vicinity of the GVTA development site.
Determine the key factors affecting hydrology and flooding at the site.
Develop a design flood simulation model to be used to assess existing flooding issues on the Base and describe the key issues affecting the proposed Project works.
Using the flood simulation model, provide key planning inputs into the design including flood planning levels for the various new Work Elements.
Using the conceptual flood models, determine planning constraints and inform stormwater management and flood flow mitigation/diversion options for consideration.

The GVTA study area is characterised by medium hills, creeks, river valleys, and sparse forest. It is located within a major catchment of the Burdekin River. This catchment has a size of 1,719,605 Ha. Hydrological modelling was undertaken using the RAFTS-XP software. Hydraulic modelling was undertaken using TUFLOW. For this preliminary study, Australian Rainfall and Runoff (1987) was adopted due to time constraints and to be conservative.

Seasonal flow analysis was undertaken for the 10% AEP event for the period between the 1st of March to 30th of November, as they are the dry season months which the routes will typically be used hence would assist in identifying the roads that require upgrading for transport and evacuation purposes. A 20% increase in intensity due to climate change was adopted for the 10% AEP seasonal and 1% AEP design flood events.

The preliminary results of the modelling indicated that the 10% AEP seasonal flood event would form the basis for setting and assessing proposed and existing bridge levels within the site. The 10% AEP design flood event was assessed to determine the flood immunity of the existing road network. The 1% AEP design flood event was assessed to set floor levels of proposed buildings and confirm site locations and freeboard to critical infrastructure.

Flood Study Queensland

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