Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 9
TABLE OF CONTENTS
EXECUTIVE SUMMARY ................................................................................................. IV
1
INTRODUCTION ......................................................................................................... 1
2
DATA COLLECTION AND REVIEW ........................................................................ 2
2.1 Overview ............................................................................................................. 2
2.2 Previous Reports ............................................................................................... 2
2.2.1 Harrington Park Hydrologic and Hydraulic Report (2000) .................... 2
2.2.2 Narellan Creek Flood Study (2015).......................................................... 2
2.2.3 Narellan Creek Flood Study Peer Review Reports (2014) ................... 3
2.2.4 Update of Narellan Creek Flood Study (2017) ....................................... 3
2.2.5 Nepean River Floodplain Risk Management Study & Plan (2022) ..... 5
2.3 Historic Data ....................................................................................................... 5
2.3.1 Rain Gauge Data ........................................................................................ 5
2.3.2 Historic Flood Marks ................................................................................... 7
2.4 Topographic Information ................................................................................... 8
2.4.1 LiDAR ............................................................................................................ 8
2.5 Geographic Information System (GIS) Data.................................................. 9
2.5.1 Stormwater ................................................................................................. 12
2.5.2 Land Use .................................................................................................... 14
2.6 Engineering Plans............................................................................................ 15
2.7 Community Consultation ................................................................................ 16
3
COMPUTER FLOOD MODELS .............................................................................. 19
3.1 General .............................................................................................................. 19
3.2 WBNM Model Development ........................................................................... 19
3.2.1 Subcatchment Delineation ....................................................................... 19
3.2.2 Subcatchment Parameterisation ............................................................ 19
3.2.3 Stream Routing.......................................................................................... 21
3.2.4 Rainfall Loss Model .................................................................................. 21
3.2.5 Detention Basins ....................................................................................... 22
3.3 TUFLOW Model Development ...................................................................... 22
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