GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project G-8 G-3-3 Hydrodynamic Model Routing of flood flows is modelled in MIKE 21. LiDAR around the Ohinemuri River was used to create a 4 m x 4 m grid to represent the floodplain and river channel ground surface. The modelled bathymetry extents are illustrated in Figure 7. The Ohinemuri River channel bathymetry is modelled based on the LiDAR surface levels. LiDAR represents the top water level rather than the bottom of the river channel, therefore the model is conservative as there is some loss of river cross sectional area. Where the river is crossed by roads, the river channel was manually cut into the 2D surface to provide continuation of the river channel. Bridges are not explicitly represented in the model at this stage as there is no evidence of historical overtopping of the bridges and therefore no interaction between the bridge deck and floodwaters. Figure 7 Hydrodynamic Model Extents – Existing Scenario
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