OPW16/0021- Operational Works Application 2 of 4

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Contents!
EXECUTIVE!SUMMARY!                                     I!

1! INTRODUCTION!                                       1!
1.1! SITE!CHARACTERISTICS!                             1!
1.2! PREVIOUS!INVESTIGATIONS!                          2!

2! STORMWATER!QUALITY!                                 5!
2.1! DESIGN!OBJECTIVES!                                5!
2.2! STORMWATER!QUALITY!TREATMENT!                     5!
2.2.1! STRATEGY!                                       5!
2.3! MODELLING!APPROACH!                               6!
2.3.1! PHILOSOPHY!                                     6!
2.3.2! MUSIC!SETUP!                                    7!
2.3.3! CATCHMENT!AREAS!                                8!
2.3.4! MUSIC!MODEL!LAYOUT!                             8!
2.4! TREATMENT!MEASURES!                               9!
2.4.1! RAINWATER!TANKS!                                9!
2.4.2! BIORETENTION!SYSTEM!                           10!
2.4.3! SEDIMENT!FOREBAYS!                             11!
2.5! RESULTS!                                         13!

3! STORMWATER!QUANTITY!                               14!
3.1!   SITE!DRAINAGE!AND!CATCHMENT!DEFINITION!        14!
3.2!   EXISTING!SCENARIO!                             15!
3.3!   RATIONAL!METHOD!CALIBRATION!                   16!
3.4!   DEVELOPED!SCENARIO!                            16!
3.5!   MITIGATED!SCENARIO!                            18!

4! DETAILED!DESIGN!DOCUMENTATION!                     20!

5! BIORETENTION!MAINTENANCE!MANUAL!                   21!

6! WATER!QUALITY!MONITORING!                          22!
6.1! CONSTRUCTION!                                    22!
6.2! OPERATIONAL!                                     22!

7! CONCLUSIONS!                                       23!

8! REFERENCES!                                        24!
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APPENDICES!
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Appendix!1:!OPW!Drawings!and!FLOTH!Design!Drawings!   25!
Appendix!2:!Rational!Method!                          26!
Appendix!3:!WBNM!results!                             27!
Appendix!4:!Bioretention!Maintenance!Manual!          28!



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Contents

EXECUTIVE SUMMARY I
1 INTRODUCTION 1
1.1. SiTE CHARACTERISTICS 1
1.2. PREVIOUS INVESTIGATIONS 2
2 STORMWATER QUALITY 5
2.1 DESIGN OBJECTIVES 5
2.2 STORMWATER QUALITY TREATMENT 5
2.2.1 STRATEGY 5
2.3. MODELLING APPROACH 6
2.3.1 PHILOSOPHY 6
2.3.2 MUSIC SETUP 7
2.3.3. CATCHMENT AREAS 8
2.3.4 MUSIC MobDEL LAYOUT 8
2.4 TREATMENT MEASURES 9
2.4.1 RAINWATER TANKS 9
2.4.2. BIORETENTION SYSTEM 10
2.4.3. SEDIMENT FOREBAYS 11
2.5 RESULTS 13
3 STORMWATER QUANTITY 14
3.1 SITE DRAINAGE AND CATCHMENT DEFINITION 14
3.2 EXISTING SCENARIO 15
3.3. RATIONAL METHOD CALIBRATION 16
3.4 DEVELOPED SCENARIO 16
3.5 MITIGATED SCENARIO 18
4 DETAILED DESIGN DOCUMENTATION 20
5 BIORETENTION MAINTENANCE MANUAL 21
6 WATER QUALITY MONITORING 22
6.1 CONSTRUCTION 22
6.2 OPERATIONAL 22
7 CONCLUSIONS 23
8 REFERENCES 24
APPENDICES

Appendix 1: OPW Drawings and FLOTH Design Drawings 25
Appendix 2: Rational Method 26
Appendix 3: WBNM results 27
Appendix 4: Bioretention Maintenance Manual 28