The modelling has shown a sensitivity to the overall rock mass permeability both in terms of inflows, potential drawdown effects and effects in the near surface. This is, in part, an artifact of 2-dimensional modelling and the orientation of the EG section relative to the wider catchment drainage pattern. It is recommended that further assessment is undertaken using a 3-dimensional, interactive groundwater-surface water model that can adequately represent the geometry and complexity of the system. T Stream Vein Model Model Setup The T-Stream Vein model has been constructed as a 2-dimensional model oriented perpendicular to the main vein system (NW-SE). The model is 1250 m wide and has an approximate 50 m x 50 m grid spacing and smaller locally. The model set-up is shown in Figure A4. Figure A4 T Stream Vein Model Setup Material Properties The model was setup as replicating a soil regolith layer overlying a rockmass. The regolith was assigned a permeability value of 1x10-6 m/s. The rockmass permeability was varied within a range of permeability values as measured for the rhyolite rockmass from K= 8x10-8 m/s (weathered volcanics) to K=1.0x10-6 m/s (fractured volcanics). The regolith was assumed to have a Storativity of 0.15 and the volcanic rockmass to be 0.01. Boundary Conditions The model boundary conditions assigned are as follows: - LHS Constant head = 230 m RL - RHS Constant head = 174 m RL
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