Reference Document - RAL23/0013.02 - Part 2 (As Published)

Table 3-2: Urban land use (Split Source Nodes) - Pollutant Export Parameters
                                                  Total Suspended
                                                                               Total Phosphorous      Total Nitrogen
                                                        Solids
                                                                                  (Log10 mg/L)         (Log10 mg/L)
     Land Use             Parameter                 (Log10 mg/L)
                                                  Storm          Base           Storm         Base    Storm    Base
                                                   Flow          Flow            Flow         Flow     Flow    Flow
                              Mean                  2.18          1.0           -0.47         -0.97   0.26      0.20
     Ground
                         Std Deviation              0.39          0.34          0.31          0.31    0.23      0.20
                              Mean                  2.43          1.0           -0.30         -0.97   0.26      0.20
       Road
                         Std Deviation              0.39          0.34          0.31          0.31    0.23      0.20
                              Mean                  1.30          N/A           -0.89         N/A     0.26      N/A
       Roof
                         Std Deviation              0.39          N/A           0.31          N/A     0.23      N/A

Table 3-3: 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 Coefficient b                                   5
                     Initial Depth (mm)                                         50
                    Daily Recharge (%)                                          28
                     Daily Drainage (%)                                         27
              Daily Deep Seepage Rate (%)                                        0



3.2.3.      Catchment Areas
The development site and external catchment has been split into three catchments containing split source
nodes (road, roof and ground) representing total developed area reporting to the bioretention basin. As it
is proposed to extend the existing bioretention basin approved with reconfiguration of lot at 25 Pavilion
Street, the catchment setup from that approval has also been represented. Table 3-4 outlines the
catchment areas and imperviousness represented within the MUSIC model. The stormwater quality
catchments are provided in Figure 3-1.

Table 3-4: Catchment Areas
     Catchment           Road (ha)        Roof (ha)        Ground (ha)           Total (ha)

 1                           0.342           0.250              0.791                1.384
 Ex1                           -             0.049              0.415                0.464
 2                           0.157           0.250              0.854                1.261
 Ex2                                         0.091              0.639                 0.73
 Impervious %                 60              100                 15                    -




23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona                                       Page 30