The modelling also allowed a drawdown profile to be generated that assumes the properties of a compressible media (tuff). This profile is shown on Figure D4 and has been used to assess the ground settlement potential. Figure D4 Willow Farm Potential Drawdown Profile Dual Tunnel Models Model Setup Two models were constructed to assess different parts of the dual tunnel effects. - A sectional model that assesses the potential for short term connections to surface waters. - A sectional model that assesses the relative difference in groundwater inflows between one tunnel and two tunnels in close proximity to each other. The first model considers a scenario where the tunnel passes through a fault that is hydraulically connected to a surface water body and assess the potential for depletion effects. The model section is shown in Figure D5. This model is 6 km wide with a 20 m x 20 m grid spacing Figure D5 Dual Tunnel Surface Effects Model
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