Sealed Judgement

Page ii

TABLE OF CONTENTS

 

1

2

5

 

Introduction ...
1.1 Site DeSCTIPHION .... cece cece cece eee eee eee e sees aces eee e sees ee eea sees ee eeesa een eaeeesaeeaeaneesaeenes 4
1.2 1S X=) oe] oO] 0) 4 | a ee 5
Assessment Approach and Data Collation ........ccccccseeeeessceeeeeeeeseeueeeeseesenseeueaeuensscuneonee 6
2.1 APPIO€CH oo. ee ee cece cece e eee eee eee ne eee nee EEE EAU A EEA EEA EAH EA GSAS neta eee ease eeaeea esa eee net aetna aS 6
2.2 Data Collation .......ccccccccccccceeeeeeeeeseeseeeeeeeeeeeeseeseeeeeeeeeeeesaeseeeeeeeeeeeseeeeeseeeeeaeeseaneeeged 6
Stormwater Quantity ManagGeMent .......cccceceeeeeeeneeeeeneeeeeeeeenseeuseeeeuseenseaeeeesensenueueeneeons 7
3.1 OVEPVICW oo eccecceccceeec ee eeee ee eeee nese eeeeeeeeeeeeeesaeseeseeeeeeeeesaeeeseeeeeeeeeseaeeeseeeseeeeeseaeeeseees 7
3.2 MOE] Data... .ccccccccccccseeceeeeeeeeeeeesaeeeeeeeeeeeeeesae esse eeeeeeeseeseeseeeeeeeeesaeseeseeeeeeneesaenenenes 7
3.2.1 Rainfall Intensity Data....... cece e eee eee eee eee eee neta rene ee eee neta eee eeaeete een eeeaeeanenenes 7
3.2.2 Rainfall LOSSES .......cccccccccceeccececeeseeeeeeeeeeeeeeseeeeeeeeeseeseeseeeeeeeeesueseseeeeeeeeeseaesesagneegs 7
3.2.3 1 eB 2f-] 6-10-10 -] eee 7
3.3 Pre-DevelopMent MOE ........ccceceeeeeeeenee cnet eens eee teense nese teases a eea sete eeaeeeeeteeeaeeeeeeanenenes 8
3.3.1 Catchment Properties......... ccc eeceeee eee erent renee eee nena neers ea ee serene ea eene tea eeanetaeeaeeeaee 8
3.3.2 Model Verification ........ccccccccccecceseeeeeeeeesueeeeseeeeeeeesseeeeseeeeeeeeeeeseeseeeeeeeseueneeeaneeegs 9
3.4 Post-DevelopMent MOdel.........ccceceeeeeeenee eee eeee eee a eee eeeeeeeeeeeeeaeeaeeeeeeaeeeeeteeeaeeeeeeanenenes 9
3.4.1 Stormwater Quantity Management Strategy ..........ceceeeseeeeeeeeeeeeeeeeeea een eeeeeeaeeneees 10
3.4.2 Characteristics of Detention SySteM........ccceeeeeeceeeee eee eee eee eeeeeeeeeeeeeaeeseeeaeeeeenenes 12
3.5 Modelling RESUItS .......ccceceeeee eee rete eee e eee e eee neers antes ean ee een ees eta eta eea een eee eeta nea eeeetee 13
3.5.1 Detention Storage Depth ........ ci eceeceeeeee seen eee tennessee eee eea eee eeee een eeeeee eee eeneeeneeaee 13
iC Fs A 08D) 10g - 1 6 | — 13
3.5.3 Concept Design of SySteM .......eeeecceceeeeeeree esse eee eeee eee eee neta eeaeeeaeeaeeeeeeaeeeeeeneeaeegs 14
Stormwater Quality MOCeIING .......cccceseseeeeeseeeeeeeeeeeenseneeeeeuseeseoeeeceeeuseuueeeseueeeusouteuens 17

4.1 Rainfall Data....

 
 
 
 
 
 

4.1.1 Rainfall runoff parameters
4.1.2 Pollutant export parameters
4.2 Catchment Properties ..
4.3 Stormwater Quality Treatment Measure
4.3.1 Bioretention Basin...

4.3.2 — Raimwater Tank .....ccccccccccccscsceeseeeeeeeeeseeseeeeeeeeeeeseeseseeeeeeeeeseeesseeeeeeeessueneseaeenegs

 

4.4 Treatment Effectiveness.

 

Conclusion...

FIGURES

Figure 1-1 Site Locality Map
Figure 1-2 Proposed Development Layout .
Figure 3-1 Pre-Development Catchment Plan
Figure 3-2. Post-Development Lumped Catchment Plan.
Figure 3-3 Post-Development Split Catchment Plan
Figure 3-4 Indicative Pipe Location
Figure 3-5 _Bioretention Basin and Level Spreader Locatio

 

  
  
 
 
 

 

Figure 4-1 Post-Development MUSIC Catchments ..........cccceeeeeeneeeeeeeeeneeeeeeeeeeeeea senses eeenenenes

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