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Appendix E - Stormwater Management Plan
Attached to the e-mail Multiple Housing – Type 3 Retirement & Special Needs (10 units) - MCU17/0551.
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Log in to see the plans as drawnTABLE OF CONTENTS
1 INTRODUCTION ............................................................................................................... 1
1.1 Scope of this report ................................................................................................. 2
1.2 Previous Documentation ......................................................................................... 2
1.3 Response to Approval Conditions ........................................................................... 3
2 SITE CHARACTERISTICS ................................................................................................ 5
2.1 Location................................................................................................................... 5
2.2 Topography and Site Drainage ............................................................................... 6
2.3 Site Discharge locations.......................................................................................... 6
3 PEAK FLOW INVESTIGATION ......................................................................................... 7
3.1 Existing Scenario .................................................................................................... 7
3.1.1 Catchment Characteristics ........................................................................ 7
3.1.2 Infiltration Loss & Lag Parameters ............................................................ 8
3.1.3 Channel Routing ........................................................................................ 8
3.1.4 Rainfall Data .............................................................................................. 8
3.1.5 Existing Peaks Flow .................................................................................. 8
3.1.6 Model Verification Check - Rational Method ............................................. 9
3.2 Developed Mitigated Scenario ................................................................................ 9
3.2.1 Catchment Characteristics ........................................................................ 9
3.2.2 Infiltration Loss & Lag Parameters .......................................................... 10
3.2.3 Channel Routing ...................................................................................... 10
3.2.4 Rainfall Data ............................................................................................ 10
3.2.5 Proposed Mitigation Strategy .................................................................. 10
3.2.6 Developed Mitigated Peaks Flow Results ............................................... 12
3.2.7 Extreme Event Sensitivity Check ............................................................. 13
3.2.8 Internal Drainage Strategy ....................................................................... 14
4 STORMWATER QUALITY .............................................................................................. 15
4.1 Pollutants of Concern ............................................................................................ 15
4.2 Water Quality Objectives....................................................................................... 15
4.3 Stormwater Quality Management Strategy ........................................................... 15
4.3.1 Utilised Treatment Systems ..................................................................... 16
4.3.2 Proposed End-of-Line Systems ............................................................... 16
4.4 MUSIC Modelling .................................................................................................. 17
4.4.1 Meteorological Data ................................................................................. 18
4.4.2 Source Nodes .......................................................................................... 18
4.4.3 Primary and Secondary Drainage Links .................................................. 18
4.4.4 Treatment Nodes ..................................................................................... 19
4.5 MUSIC Modelling Results ..................................................................................... 21
5 WATERWAY STABILITY MANAGEMENT ...................................................................... 22
6 CONCLUSION ................................................................................................................. 23
7 RECOMMENDATIONS ................................................................................................... 23
8 DISCLAIMER ................................................................................................................... 24
9 REFERENCES ................................................................................................................ 24
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