Minnegang Creek Flood Study Report - Wollongong City Council

MODEL SENSITIVITYThe following tables present the results of the sensitivity analysis carried out to assess the robustness ofthe RAFTS model to the chosen model parameters. This analysis was carried out for the 1% and 20%AEP events for the catchment, assuming a 1 minute lag time between all sub-catchments. The followingtwo tables present the results of the analysis for a range of parameters.The flows at MHG represent the total flow from the catchment for each of the 1% and 20% AEP events.Table D1 1% AEP flood eventMannings n 0.025 0.025 0.025 0.025 0.02 0.05% impervious 5 5 5 10 5 5Initial loss 15 35 10 15 15 15Continuing loss 2.5 2.5 0 2.5 2.5 2.5MC1 32.12 29.44 32.85 33.09 33.55 28.51MC2 32.80 30.09 33.56 33.77 34.20 29.38MC3 33.25 30.51 34.02 34.20 34.61 29.99MC4 35.06 32.17 35.92 35.89 36.23 32.31MH001A 0.50 0.50 0.50 0.52 0.52 0.41MH100 3.08 2.82 3.14 3.23 3.29 2.65MH101 0.94 0.93 0.95 1.00 1.02 0.79MH104 0.85 0.85 0.86 0.90 0.93 0.72MH110 3.23 3.04 3.28 3.42 3.51 2.66MH111 3.01 2.83 3.06 3.20 3.29 2.46MH114 0.76 0.75 0.77 0.81 0.83 0.65MH115 0.88 0.86 0.89 0.92 0.94 0.74MH132 0.82 0.81 0.83 0.87 0.89 0.69MH134 0.90 0.89 0.91 0.95 0.96 0.75MH21 1.36 1.32 1.38 1.46 1.51 1.16MH23 0.87 0.82 0.88 0.93 0.96 0.72MH24 0.82 0.77 0.83 0.87 0.90 0.67MH25 2.65 2.53 2.68 2.81 2.88 2.26MH26 2.60 2.50 2.64 2.77 2.84 2.22MH26A 2.34 2.26 2.37 2.49 2.57 1.99MH27 2.54 2.53 2.57 2.64 2.67 2.14MH27A 5.21 5.19 5.28 5.37 5.49 4.52MH28 2.50 2.49 2.53 2.61 2.64 2.10MH29 2.24 2.23 2.27 2.33 2.36 1.93MH30 2.20 2.19 2.23 2.29 2.32 1.88MH31 0.47 0.47 0.48 0.50 0.51 0.39MH32 0.11 0.11 0.11 0.12 0.12 0.09MH36 0.19 0.19 0.19 0.20 0.20 0.16MH41 2.54 2.41 2.58 2.69 2.76 2.14MH42 2.48 2.35 2.51 2.63 2.70 2.08MH43 0.79 0.76 0.80 0.85 0.87 0.66MH46 1.15 1.15 1.17 1.22 1.24 0.98MH47 1.30 1.29 1.31 1.36 1.38 1.10MH48 1.62 1.62 1.64 1.69 1.71 1.42MH50 0.77 0.77 0.78 0.81 0.83 0.65SV8507-DO-001 Rev 2 D-318/10/02