RFI - Appendix D- Stormwater Management Plan · MCU22/0140

         WBNM WHOLE OF SITE DETENTION SUMMARY
          Pre-Development      Post-Development
 AEP                                                                  Performance
         Q (m 3/s)    Duration (min)    Q (m 3/s)    Duration (min)
63.20%        0.021              15          0.013              15           62%
39.35%        0.029              15          0.027              15           93%
18.14%        0.039              15          0.039              15          100%
 10%          0.049              10          0.046              15           94%
 5%            0.06              10          0.052              15           87%
 2%           0.067              10          0.064              10           96%
 1%           0.074              10          0.074              10          100%

           RATIONAL METHOD - WBNM CALIBRATION
         Pre-Development RM            Pre-Development WBNM
 AEP          3
                                                                      Difference
         Q (m /s)     Duration (min)    Q (m 3/s)    Duration (min)
63.20%         0.02                5         0.021              15          105%
39.35%        0.027                5         0.029              15          107%
18.14%        0.038                5         0.039              15          103%
 10%          0.046                5         0.049              10          107%
 5%           0.054                5          0.06              10          111%
 2%            0.07                5         0.067              10           96%
 1%            0.08                5         0.074              10           93%

           RATIONAL METHOD - WBNM COMPARSION
         Pre-Development RM            Post-Development WBNM
 AEP          3
                                                                      Difference
         Q (m /s)     Duration (min)    Q (m 3/s)    Duration (min)
63.20%         0.02                5         0.013              15           65%
39.35%        0.027                5         0.027              15          100%
18.14%        0.038                5         0.039              15          103%
 10%          0.046                5         0.046              15          100%
 5%           0.054                5         0.052              15           96%
 2%            0.07                5         0.064              10           91%
 1%            0.08                5         0.074              10           93%


[OCR of page images]
WBNM WHOLE OF SITE DETENTION SUMMARY

ie Pre-Development Post-Development
Q (m?/s) Duration (min) Q (m?/s) Duration (min)
63.20% 0.021 15 0.013 15
39.35% 0.029 15 0.027 15
18.14% 0.039 15 0.039 15
10% 0.049 10 0.046 15
5% 0.06 10 0.052 15
2% 0.067 10 0.064 10
1% 0.074 10 0.074 10
RATIONAL METHOD - WBNM CALIBRATION

er Pre-Development RM Pre-Development WBNM
Q (m?/s) Duration (min) Q (m?/s) Duration (min)
63.20% 0.02 5 0.021 15
39.35% 0.027 5 0.029 15
18.14% 0.038 5 0.039 15
10% 0.046 5 0.049 10
5% 0.054 5 0.06 10
2% 0.07 5 0.067 10
1% 0.08 5 0.074 10

RATIONAL METHOD - WBNM COMPARSION

ie Pre-Development RM Post-Development WBNM
Q (m?/s) Duration (min) Q (m?/s) Duration (min)
63.20% 0.02 5 0.013 15
39.35% 0.027 5 0.027 15
18.14% 0.038 5 0.039 15
10% 0.046 5 0.046 15
5% 0.054 5 0.052 15
2% 0.07 5 0.064 10
1% 0.08 5 0.074 10

Performance

62%
93%
100%
94%
87%
96%
100%

Difference

105%
107%
103%
107%
111%

96%

93%

Difference

65%
100%
103%
100%

96%

91%

93%