stormwater mgJ00300R1V1_25_Kauri_St_Cooroy_Complete · MCU18/0165

25 Kauri St Cooroy




Table 5-2: MUSIC Pollutant Concentration Parameters

                                         Total Suspended       Total
                                                                            Total Nitrogen
                                           Solids (Log10    Phosphorous
                                                                             (Log10 mg/L)
                                               mg/L)        (Log10 mg/L)
  Land Use              Parameter
                                           Storm    Base    Storm   Base    Storm     Base
                                           Flow     Flow    Flow    Flow    Flow      Flow

 Residential              Mean             1.30      N/A    -0.89   N/A     0.26       N/A
   Roof
     (split)           Std Deviation       0.39      N/A    0.31    N/A     0.23       N/A
 Residential              Mean             2.18      1.0    -0.47   -0.97   0.26      0.20
  Ground
     (split)           Std Deviation       0.39      0.34   0.31    0.31    0.23      0.20

 Residential              Mean             2.43      1.0    -0.30   -0.97   0.26      0.20
 Road (split)          Std Deviation       0.39      0.34   0.31    0.31    0.23      0.20



Table 5-3: MUSIC Runoff Generation Parameters

                     Parameter                     Urban
           Rainfall Threshold (mm)                   1
               Soil Capacity (mm)                   500
               Initial Storage (%)                  10
                 Field Capacity                     200
     Infiltration Capacity Coefficient a            211
      Infiltration Capacity Exponent b               5
               Initial Depth (mm)                   50
          Daily Recharge Rate (%)                   28
          Daily Base Flow Rate (%)                  27
       Daily Deep Seepage Rate (%)                   0



5.2.3 Water Quality Treatment Catchments

The bioretention has been sized to treat runoff from a the residential developed shown on the
Site Plan in Appendix B. The MUSIC modelling has been carried out using a split source node
approach. The modelled water quality catchments and the associated landuses are shown on
Image 5-1. Areas of the proposed site not designated as roof or road have been assigned a
residential ground landuse with a Fraction Impervious of 30%.



J00300R1V1                                                                                12