Pre-Request Response Application 132001.210310.1

A: QUEENSLAND RATIONAL METHOD CALCULATIONS                                                                       -
                                                                                                                     CALIBRATION OF WBNM
File:         H:\B09\150-199\B09182.w\Stormwater\[B09182.w RM.xls]Calibration Model
Date:         29/10/2011



~~Lzy: EE’~1
IFD Ref:      IFD_NSC Coastal
IFD Source:   Derived from Noosa Shire Council Rainfalllntensizy Curves Coastal (to Foothills) STD. DRG. 9231 (1991)Bureau of Meteorology Chart Noosa Heads (1987)
TIME OF CONCENTRATION CALCULATIONS As per Section 4.06.3 QUDM Method (c)Bushland Catchments too small to allow the formation of a creek with defined bed and banks.
                                                                                                                         Pipe
                                                                                                            Se Slope    Diameter     Velocity    Wetted Area   Wetted Perimeter
Equation Type 1 Method                                                   Area (ha)           Length (km)       (%)       (mm)         (m/s)         (m2)             (m)              Manning’s n    Chez’s Coeff   tc (min)

                                                                            9;"38"   .   I

Equation 4.06 QUDM       Friends Equation for Overland Sheet Flow
                                                                                             .



                                                                                              -,’6:i2,.3f".P? -.i.no"                                                             r      -0;1   ,"




                                                                                                                                                                                                                    Pn
                     -




Adopted concentrated flow velocizy                                                       f       0136971                            [. l’
                                                                                                                                                                                                        Total       L1LJ
                                                                                                                                                                                                     LN!@t f          42       Imin
C10 VALUE
                                                                             ’I              \0(mm/hr)                                                               Cl0
Enter Fraction Impervious

Table 5.04.2 QUDM               ~.,                                         0;00. .’ ’.           73




                                                                                                                                                Adopted c101
                                                                                                                                                                    0.70




FLOW CALCULATIONS
Equation 4.01 QUDM Queensland Rational Method
                     -




                                                                                                 AdootedT"ImeofCon       ntration      42
                                                                            ARI                  Cy            tc~       A (ha)      Q(m%)
                                                                             2                   0.60          63        9.38         0.98
                                                                             5                   0.67          78        9.38         1.36
                                                                             10                  0.70          88        9.38         1.61
                                                                             20                  0.74          100       9.38         1.92
                                                                             50                  0.81          121       9.38         2.53
                                                                            100                  0.84          130       9.38         2.85