BBNE01676-0001-REP-001-0-Noosa Calile Overland Flow_Optimized

     2.1.1       Modelling Parameters
A hydrologic analysis of the Site and contributing catchments has been undertaken to determine the pre and post-development peak
discharges. Key hydrologic model details are provided in Table 2.2.

TABLE 2.2: KEY MODELLING PARAMETERS - HYDROLOGY

    Parameter                            Details                                       Basis / Comments

    Software                             WBNM                                          -

    Approach                             ARR 2019 Methodology                          -

    Pervious Initial and Continuing
                                         31mm / 3.4mm/hr
    Losses
                                                                                       ARR Data Hub
                                                                                       Lat: -26.394
    Temporal Patterns                    East Coast North (ECNorth)
                                                                                       Long: 153.085
    Pre-Burst                            Median

                                                                                       BOM Rainfall IFD Data System
    IFD                                  -                                             Lat: -26.394
                                                                                       Long: 153.085


     2.1.2       Summary of Peak Flows
TABLE 2.3: PEAK DISCHARGE

                                                            1% AEP                                    1% (2100) AEP

    Model Outlet                                            1.91                                      2.32




2.2             Local Flood Model
Flood modelling of the local catchment has been carried out using TUFLOW software developed by BMT WBM. TUFLOW is a computational
engine that provides one-dimensional (1D) and two-dimensional (2D) solutions for the free surface flow equations to simulate flood and
tidal wave propagation. The Heavily Parallelised Compute (HPC) computational method has been applied using 2023-10-AE version of
TUFLOW. Modelling assumptions and outcomes are described below.


     2.2.1       Model Setup
A local flood model has been setup to represent the Proposed scenario for the site and are described below:

•     Proposed Scenario (100) – The Proposed Scenario has been prepared to represent the proposed development (including changes to
      hydrology, earthworks and associated infrastructure) to assess any potential changes that may result within the drainage path from the
      development works.

The TUFLOW hydraulic model been assessed for 1% AEP and 1% AEP Climate Change storm events. The assessment has considered a range
of storm durations (15 min to 120 min) to ensure that the critical storm is defined. Critical duration was under 15 minutes for all events. A
summary of the model setup is detailed below with TUFLOW model setup presented below in Figure 2.2.




NOOSA CALILE I BBNE01676-0001-REP-001-0                                                                                                     6