Appendix B - Amended Biome Consulting Response

Catchment B - Existing Rational Method Calcs
File:           H:\B14\150-199\B14158.W\01 Final Layout Op Works\SW_Quantity\BHP WORKING_20161223\[B14158.W_Rational Method Calculations_20161223.xlsx]Existing_B
Date:           23/01/2017
Job:            B14158.W
By:             BHP
Locality:       NSC Plateau
IFD Ref:        IFD_NSC Plateau
IFD Source:     Derived from Noosa Shire Council Rainfall Intensity Curves Tinbeerwah to Black Mountain (Plateau) STD. DRG. 9232 (1991)Bureau of Meteorology Chart Noosa Heads (1987)

Time of Concentration Calculations
                                                                                                              Av.           Pipe                                         Wetted                Roughness
                                                                                                                                          Velocity        Wetted Area                Hydraulic             Sub Total
Reference                      Equation Type / Method                   Area (ha)           Length (m)        Slope         Diameter                                     Perimeter             (Mannings/H               tc (min)
                                                                                                                                          (m/s)           (m2)                       Radius R              (mins)
                                                                                                              (%)           (mm)                                         (m)                   ortons)

4.06.6 QUDM                    Overland Sheet Flow - Friends Equation         16.16              200                0.5                                                                           0.045         32

4.06.8 QUDM                    Concentrated Overland / Channel Flow                              340                                          1.5                                                               4             36
                                                                                                                                                                                                            Adopted tc        36

C10 VALUE
Enter Fraction Impervious      Development Category                     fi                  1I10 (mm/hr)                                                                 C10


Table 5.04.2 QUDM                                                             0.08               70                                                                         0.72

                                                                                                                                                           Adopted C10      0.72

                                                                        Flow Calculations (QUDM 4.03.1)
                                                                                                                               tc (min)       36
                                                                                                              tc
                                                                        ARI                 Cy                 Iy           A (ha)        Q (m3/s)
                                                                                        1              0.57            52        16.16             1.32
                                                                                        2              0.61            66        16.16             1.81
                                                                                        5              0.68            84        16.16             2.56
                                                                                       10              0.72            93        16.16             2.98
                                                                                       20              0.75           110        16.16             3.71
                                                                                       50              0.82           131        16.16             4.84
                                                                                      100              0.86           138        16.16             5.30