Stormwater Management Plan -OPW (A) · OPW25/0042

                                                          - Contents -
1.0 INTRODUCTION ......................................................................................................................... 1

2.0 EXISTING SITE CONDITIONS ………………………………………………………………..1

3.0 PROPOSED DEVELOPMENT…………………………………………………………………..2

4.0 COUNCIL CONDITIONS……………………………………………………………………….2

5.0 RAINWATER HARVESTING AND RE-USE…………………………………………………4

6.0 STORMWATER TREATMENT AND INFILTRATION…………………………………….5

           6.1 RAPID INFILTRATION PITS/RAPID INFILTRATION CULVERT (RIP/RIC) ..7

           6.2 RIP/RIC INFILTRATION CAPACITIES……………………………………………..7

           6.2.1 PROTOTYPE RIP TEST RESULTS 2003……………………………………………8

           6.2.2 PROTOTYPE RIC TEST RESULTS 2025……………………………………………9

           6.2.3 PROTOTYPE RIP/RIC TEST RESULT COMPARISON & APPLICATION…...9

7.0 RIP/RIC DESIGN AND MODELLING………………………………………………………..9

7.1 RIP/RIC CAPACITY MODELLING – EXCEL SPREADSHEET…………………………..10

7.2 OVERALL DEVELOPMENT SITE INFILTRATION – QUANTITY MUSIC MODEL...12

7.2.1 DETERMINATION OF INFILTRATION RATES FOR QUANTITY MUSIC
MODELLING
………………………………………………………………………………….............................……12

7.2.2 DETERMINATION OF EXTENDED DETENTION DEPTHS FOR QUANTITY
MUSIC MODELLING ………………………………………………………………………….…..12

7.2.3 DETERMINATION OF OTHER PARAMETERS FOR QUANTITY MUSIC
MODELLING ……………………………………………………………………………..…………13

7.2.3(A) DEPTH OF INFILTRATION MEDIA………………………………………….………..13

7.2.3(B)UNLINED FILTER MEDIA PERIMETER……………………………………………….13

7.2.3(C)FILTER AREA……………………………………………………………………………….13

7.3 QUANTITY MUSIC MODEL RESULTS……………………………………………………..14

8.0 STORWMATER QUALITY…………………………………………………………………….15