Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 11
Narellan Creek Catchment
Flood Study
5.4.4 Stormwater System Capacity .................................................................. 45
5.4.5 Flood Hazard ............................................................................................. 46
5.4.6 Flood Emergency Response Classifications ........................................ 47
5.4.7 Flood Function ........................................................................................... 49
5.5 Flood Damage Assessment ........................................................................... 50
5.6 Future Catchment Development ................................................................... 55
5.6.1 Turner Road Growth Area ....................................................................... 55
5.6.2 Cumulative Development Assessment .................................................. 56
5.7 Discussion on Flood Behaviour ..................................................................... 58
6
SENSITIVITY AND CLIMATE CHANGE ANALYSIS........................................... 60
6.1 Overview ........................................................................................................... 60
6.2 Hydrologic Model Inputs ................................................................................. 60
6.2.1 Initial / Burst Loss ...................................................................................... 60
6.2.2 Continuing Loss Rate ............................................................................... 61
6.2.3 Temporal Pattern ...................................................................................... 62
6.3 Hydraulic Model Inputs ................................................................................... 63
6.3.1 Roughness Coefficients ........................................................................... 63
6.3.2 Structure Losses ....................................................................................... 63
6.3.3 Blockage ..................................................................................................... 64
6.3.4 Nepean River Level .................................................................................. 64
6.4 Australian Rainfall & Runoff 1987 ................................................................. 65
6.5 Climate Change Analysis ............................................................................... 65
7
FLOOD PLANNING INFORMATION ..................................................................... 69
7.1 Overview ........................................................................................................... 69
7.2 Flood Planning Area ........................................................................................ 69
7.3 Flood Planning Constraint Categories ......................................................... 70
7.4 Floodplain Risk Precincts ............................................................................... 72
8
CONCLUSION ........................................................................................................... 74
9
REFERENCES........................................................................................................... 76
ix
