Reference Documents - MCU23 0070

RATIONAL METHOD CALCULATION – EXTERNAL
CATCHMENT (DOUGLAS LANE)
                                          EXTERNAL
Catchment Details
                                         CATCHMENT
Area (ha)                                   0.1302
Impervious Area (ha)                        0.1042
Fraction Impervious (%)                      80%
1
 I60 (mm/hr)                                 75.2
C1                                           0.70
C2                                           0.74
C5                                           0.83
C10                                          0.87
C20                                          0.91
C50                                          1.00
C100                                         1.00


Time of Concentration (min)
       Catchment                               Method                                    Tc
  EXTERNAL CATCHMENT Standard inlet time, mostly paved/impervious areas                   6

Rainfall Intensities (mm/hr)
        Catchment            1yr ARI       2yr ARI   5yr ARI   10yr ARI   20yr ARI    50yr ARI     100yr ARI
 EXTERNAL CATCHMENT            120           151       184       215        245         284           313



Stormwater Quantities (m3/s)
       Catchment            1yr ARI        2yr ARI   5yr ARI   10yr ARI   20yr ARI    50yr ARI     100yr ARI
  EXTERNAL CATCHMENT         0.030          0.040     0.055     0.068      0.081       0.103         0.113




SITE BASED STORMWATER MANAGEMENT PLAN – Revision B                         36 & 38 DUKE STREET, SUNSHINE BEACH