Development Application part 7 of 10 Stormwater Management Report - MCU13/0092

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Appendix B               -
                               Calculations


                                                   Table 9: Discharge Calculation Table



       Catchment              Area
                                          Maior Storm Event Q100          Minor Storm Event Q20    Treatable Storm Event Q3 month
                                          Intensit     Discharge          Intensi!    Discharge     Intensit         Discharge

      Catchment A       0.3494 ha        315 mm/hr           0.306 m3/s   247 mmlhr   0.221 m3/s    63 mm/hr         0.043 m3/s
      Catchment B       0.1023ha         315 mm/hr           0.090 m3/s   247 mmlhr   0.065 m3/s   63 mm/hr          0.013 m3/s
      Catchment C       0.1893 ha        315 mm/hr           0.166 m3/s   247 mmlhr   0.119m3/s    63 mm/hr          0.023 m3/s
      Catchment C       0.0094 ha        315 mm/hr           0.008 m3/s   247 mmlhr   0.006 m3/s   63 mm/hr          0.001 m3/s




Sample Calculations
MINOR STORM EVENT Q1(1O
AREA                                 0.3494ha


RAINFALL INTENSITY
1,00               315mm/hr (From AR&R)
For 5 minute duration


COEFICIENT OF RUNOFF
Cm                      1.0


DISCHARGE
Q,OD                    CIA                     0.306 m’!s
                        360



M!NOR STORM EVENT Q,.
AREA        =                        0.3494ha


RAINFALL INTENSITY
1,0                     247mm!hr     (From AR&R)
For 5 minute duration


COEFICIENT OF RUNOFF
C20                     0.92


DISCHARGE
Q"                      CIA                     0.090 m’!s
                        360


TREA TABLE STORM EVENT Q 3month
AREA                                 0.3494ha


RAINFALL INTENSITY
hmooth                  63mm!hr      (From AR&R)
For 5 minute duration


COEFICIENT OF RUNOFF
C,month                 0.7


DISCHARGE
Q’month                 CIA                     0.043 m’!s
                        360




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