Minnegang Creek Flood Study Report - Wollongong City Council

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FIGURESSectionPageFigure 2-1 Catchment and study area 2-4Figure 2-2 Zoning boundaries 2-5Figure 2-3 Minnegang Creek and tributaries 2-6Figure 4-1 RAFTS model layout 4-10Figure 5-1 MIKE 11 construction 5-18Figure 5-2 17 August 1998 event flood profile 5-27Figure 5-3 17 August 1998 event flood extents 5-28Figure 5-4 Hydraulic roughness sensitivity 5-30Figure 5-5 Tailwater levels sensitivity 5-31Figure 5-6 RatHGL model layout 5-35Figure 6-1 Design Flood Profiles - Minnegan Branch 6-38Figure 6-2 Design Flood Profiles - Melinda Branch 6-40Figure 6-3 Design Flood Profiles - Lakehts2 Branch 6-41Figure 6-4 1% AEP Flood Contours 6-42Figure 6-5 2% AEP Flood Contours 6-43Figure 6-6 5% AEP Flood Contours 6-44Figure 6-7 20% AEP Flood Contours 6-45Figure 6-8 Velocity and flow distributions - Minnegan 0.402 6-46Figure 6-9 Velocity and flow distributions - Minnegan 0.616 6-47Figure 6-10 Velocity and flow distributions - Minnegan 0.835 6-48Figure 6-11 Velocity and flow distributions - Minnegan 1.545 6-49Figure 6-12 Velocity and flow distributions - Melinda 0.328 6-50Figure 6-13 1% AEP flood profilesLake Heights Road culvert 6-57Figure 6-14 1% AEP flood profilesBarina Park detention basin 6-58Figure 6-15 1% AEP flood profiles - Jane Avenue bridge 6-59Figure 6-16 1% AEP flood profilesNorthcliffe Drive and Illawarra Yacht Club culverts 6-60SV8507-D0-001 Rev 218/10/02vi
TABLESSectionPageTable 4 -1 Adopted losses in RAFTS model(and range of losses considered) 4-11Table 4 -2 Summary of rainfall intensities 4-12Table 4 -3 Comparison of RAFTS and PRM flows (m 3 /s) 4-13Table 5 -1 MIKE 11 river branches 5-17Table 5 -2 Typical Manning’s n values used in the hydraulic model 5-21Table 5 -3 Tailwater levels adopted for hydraulic modelling 5-22Table 5 -4 Recorded flood levels for the 17 August 1998 event 5-25Table 5 -5 Comparison of modelled results withrecorded flood levels for the 17 August 1998 event 5-26Table 5 -6 RatHGL manhole inlet capacities 5-34Table 6 -1 Peak design discharges 6-38Table 6 -2 Piped drainage system capacities 6-52Table 6 -3 Culvert structures 6-52Table 6 -4 Culvert capacities 6-53SV8507-D0-001 Rev 218/10/02vii
Page 1 and 2: Minnegang CreekFlood Study
Page 3: © Kellogg Brown & Root Pty Ltd, 20
Page 6 and 7: SummaryThis report presents the det
Page 8 and 9: The RatHGL modelling indicated that
Page 12 and 13: ABBREVIATIONSAEPAHDARIAR&RDCPIFDLEP
Page 14 and 15: 2 Catchment DescriptionThe Minnegan
Page 16: Figure 2.1CATCHMENT AND STUDY AREAM
Page 20 and 21: Illawarra Flood Study investigated
Page 23 and 24: The catchment was divided into 64 s
Page 25 and 26: To determine the peak flow from the
Page 27 and 28: 5 Hydraulic Modelling5.1 INTRODUCTI
Page 29: Table 5-1 MIKE 11 river branchesBra
Page 32 and 33: elationship that is determined from
Page 34 and 35: interaction between the numerical m
Page 36 and 37: significantly affected since the ex
Page 38 and 39: Since Points A and B correspond to
Page 41 and 42: 5.9 MODEL SENSITIVITY ANALYSESSensi
Page 43 and 44: 555053.09RANCHBY AVEElevation (m AH
Page 45 and 46: Creek and pass directly over Northc
Page 47: 5.12.4 Overland flow pathsAs discus
Page 50 and 51: Table 6-1 Peak design dischargesBra
Page 52 and 53: 55.050.0PMF Flood Level1% AEP Flood
Page 58 and 59: 1% AEP velocities and flow distribu
Page 60 and 61:
2524.52423.5RL (m)231% AEP velociti
Page 62 and 63:
RL (m)3433.53332.53231.53130.53029.
Page 64 and 65:
Figure 5-6.Table 6-2 Piped drainage
Page 66 and 67:
that handrails above these structur
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flooding within the catchment are n
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35.01% AEP flood level - blocked ca
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20.01% AEP flood level - blocked ca
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Appendix AReferencesBureau of Meteo
Page 76 and 77:
Appendix BGLOSSARYSV8507-DO-001 Rev
Page 78 and 79:
hydraulicshydrographhydrologyMIKE 1
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Appendix CHistorical Flood DataRECO
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Time Rain(mm)Time Rain(mm)Time Rain
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Appendix DRAFTS HYDROLOGIC MODELSV8
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MHE .5359 .3573 12.10 12.10 5.000 1
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Mannings n 0.025 0.025 0.025 0.025
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Mannings n 0.025 0.025 0.025 0.025
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MH94 67.500 15.00 1.500 2.500 .0000
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Appendix EMIKE 11 HYDRAULIC MODELSV
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EXIST ; DENISE2 ; 0.005; 0.133; 100
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22.40; 88.40;23.30; 100.00;25.10; 1
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27.26; 128.96;27.43; 137.64;28.08;
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1; 1.250;0;1.800; 1.250; 0.000; 0.0
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PIPE_10; 0.108; EXIST;57.000; 159.0
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Appendix FMIKE11 RESULTS SUMMARYThi
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BRANCH CHAINAGE PMF 1% AEP 2% AEP 5
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Minnegang Creek Flood Study Report - Wollongong City Council

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