Reference Documents - 5 School Street, Pomona - MCU24/0165 & OPW24/0222

                                                                                                             ABN 51 640 311 842
                                                                                                                       CONTACT
                                                                                                               arcosgroup.com.au
                                                                                                                        OFFICES
                                                                                           Sunshine Coast | Brisbane | Gold Coast




                 TABLE 4: RECOMMENDED RAINFALL-RUNOFF PARAMETERS

                  Parameter                                                         Urban Residential
                  Rainfall threshold (mm)                                                     1
                  Soil storage capacity (mm)                                              500
                  Initial storage (% capacity)                                             10
                  Field capacity (mm)                                                     200
                  Infiltration capacity - Coefficient a                                   211
                  Infiltration capacity - Exponent b                                       5.0
                  Initial depth (mm)                                                       50
                  Daily recharge rate (%)                                                  28
                  Daily baseflow rate (%)                                                  27
                  Daily deep seepage rate (%)                                                 0
                 5.6.2.5 Pollutant Export Parameters
                 The pollutant export parameters for split catchment land use was adopted for MUSIC modelling and
                 are shown in Table 5.
                 TABLE 5: POLLUTANT EXPORT PARAMETERS – SPLIT CATCHMENT URBAN RESIDENTIAL LAND USE

                      Flow Type         Surface Type      Total Suspended      Total                 Total Nitrogen
                                                            Solids (TSS)    Phosphorous                   (TN)
                                                            (Log10 mg/L)        (TP)                  (Log10 mg/L)
                                                                            (Log10 mg/L)

                                                          Mean      Std     Mean        Std          Mean             Std
                                                                    Dev                 Dev                           Dev
                  Baseflow              Roof               N/A      N/A     N/A         N/A           N/A              N/A
                  concentration
                  parameters            Road Reserve       1.00     0.34    -0.97       0.31          0.20            0.20
                                        Ground             1.00     0.34    -0.97       0.31          0.20            0.20
                  Stormflow             Roof               1.30     0.39    -0.89       0.31          0.26            0.23
                  concentration
                  parameters            Road Reserve       2.43     0.39    -0.30       0.31          0.26            0.23
                                        Ground             2.18     0.39    -0.47       0.31          0.26            0.23

                 5.6.2.6   MUSIC Model Layout
                 The model node arrangement shown in Figure 8 has been adopted and is representative of the
                 proposed development.




                  15 November 2024                                                                                    Page 13
Document Set ID: 23679130
Version: 1, Version Date: 08/04/2025