Tasmanian Strategic Flood Map (TSFM) Design Flood Event (DFE) outputs. These outputs represent the simulated peak flood velocity in metres per second (m.s -1) for a series of Design Flood Events (2%, 1%, 0.5% and 1% AEP Climate Change). This data is a composite data set of model outputs from twenty-five (25) separate hydrodynamic models. The data provides coverage for all of Tasmania excluding King Island, the Gordon - Franklin basin, Furneaux Islands, and Macquarie Island. Mapping should be interpreted using hydrology and hydrodynamic methodology reports, and relevant catchment level methodology reports on the State Emergency Service Website: https://www.ses.tas.gov.au/floodmaps/tasmanian-flood-mapping-project-reports/. The TSFM offers a strategic view of flood-prone areas under current and future climate conditions and is subject to refinement by respective Local Government Authorities or SES as more refined data becomes available. Decisions on the use of the data should be informed by the supporting technical reports and documentation.

The data represents the simulated peak velocity in metres per second (m.s -1) for a series of Design Flood Events (2%, 1%, 0.5% and 1% AEP Climate Change). The raster outputs are at 10m resolution derived from Infoworks ICM flood model terrain-sensitive mesh output. Original model terrain-sensitive mesh elements vary accross each study area and range between 25m^2 to 2,500m^2 resolution based on predefined zones. The dataset was compiled from 25 individual hydrodynamic models covering the majority of the state of Tasmania, excluding King Island, Gordon-Franklin basin, Furneaux Islands, Macquarie Island. Data input sources include digital elevation models (DEM), historical rainfall, and streamflow records, with modelling parameters calibrated to local conditions. Assumptions and Constraints: Flood hazard, level, velocity and depth outputs are based on simulated hydrodynamic conditions reflecting current and future climate and land use parameters. Assumptions include catchment and sub-catchment topology and parameters, typical flow resistance values, and hydrologic model calibration events. Constraints arise from the limitations in spatial resolution and the simplifications inherent in model assumptions, which may not fully capture local variability. Description of assumptions and constraints are detailed in hydrology and hydrodynamic methodology reports, and relevant catchment level reports. These reports can be found on the State Emergency Service Website: https://www.ses.tas.gov.au/floodmaps/tasmanian-flood-mapping-project-reports/ Each catchment study area report contains an uncertainty assessment with quality statements on hydrology, digital terrain model, and hydrodynamic factors contributing to the result. Position Accuracy: Model outputs are aligned to input DEM's, with a typical horizontal accuracy of +/-0.3-1m and vertical accuracy of +/-0.15-0.3m. Due to this, positional accuracy varies throughout the dataset. Original model outputs at 25m^2 to 2,500m^2 resolution as triangulated terrain-sensitive mesh. Attribute Accuracy: Each raster cell represents the velocity of in metres per second (m.s -1). The output accuracy is limited by the accuracy and precision of the inputs such as the Digital Elevation Model (DEM). Please refer to the reports as described above. Logical Consistency: The data maintains logical consistency across all modelled extents. Consistent methodologies for model setup, parameterisation, and output verification ensure consistent outputs across Tasmania. Several processes were applied to the raw datasets to execute filtering consistent with methods in national best practice guidelines. Such guidelines include the Australian Rainfall and Runoff Guidelines, Book 6, Chapter 7, Australian Rainfall and Runoff Guidelines - Two-Dimensional Modelling in Urban and Rural Floodplains, Section 11.5.1 and the Australian Institute for Disaster Resilience (AIDR) - Handbook 7-5 Flood Information to Support Land-use Planning. Further details on post-processing can be found in the Filtering of the Hydrodynamic & Hydrology Model Outputs report on the State Emergency Service Website as stated above. Completeness: Completeness is subject to available data and is representative of areas with significant flood risk under current and future climate conditions. The spatial layers cover the majority of the state of Tasmania, excluding King Island, the Gordon - Franklin basin, Furneaux Islands, and Macquarie Island.