Refernce Documents - RAL25 0001

                       Peak Discharge Calculations - CMT 3
                       Reference - Chapter 4 QUDM.




                      Job Name.              Hoy Rd, QLD                          CATCHMENT INFORMATION
                      Job No.                6535                               LOCAL AUTHORITY                             NSC
                      Date                   9/12/2024                          IFD INFORMATION                          Noosa IFD
                      Designed               MVC                                10% AEP 60min                              70.6
                      Checked                JW


                          EXISTING TIME OF CONCENTRATION                                          DEVELOPED TIME OF CONCENTRATION                                              COEFFICIENT OF RUNOFF
                                                                                                                                                        Sub-Catchment Area (Ha) Fraction Impervious (%)     Runoff Coefficients
                                             Std Inlet Time                                                          Std Inlet Time           CMT No.    Existing     Developed    Existing   Developed     Existing     Developed
                                                                                                                                                1         5.261         5.26           0        3.80          0.70         0.708
                                                                                                                                                2
                              SHEET FLOW




                                                                                                      SHEET FLOW
                                             Slope (%)              7.0                                              Slope (%)                  3
                                             Flow Length (m)       30.0                                              Flow Length (m)            4
                                             Horton's 'n'          0.045                                             Horton's 'n'               5
                                             Flow Time (min)       10.1                                              Flow Time (min)           Total      5.261         5.260         0          3.80        0.70           0.71


                                                                                                                                                                                    PEAK DISCHARGE CALCULATIONS
                              CHANNEL FLOW




                                                                                                      CHANNEL FLOW
                                             Flow Length (m)       130.0                                             Flow Length (m)                       Rainfall (mm/hr)        Coefficient of Runoff  Peak Discharge (m³/s)
                                             Fall (m)              29.0                                              Fall (m)                  AEP       Existing     Developed    Existing   Developed     Existing     Developed   Difference (%)
                                             Flow Time (min)       0.75                                              Flow Time (min)           63%        82.6          82.6        0.56         0.57        0.68           0.68          1.1
                                             Multiplier ∆            3                                               Multiplier ∆              39%        103           103         0.60         0.60        0.90           0.91          1.1
                                             Flow Time (min)        2.3                                              Flow Time (min)           18%        128           128         0.67         0.67        1.24           1.26          1.1
                                                                                                                                               10%        146           146         0.70         0.71        1.49           1.51          1.1
                                                                                                                                                5%        166           166         0.74         0.74        1.78           1.80          1.1
                              CHANNEL FLOW




                                             Flow Length (m)       140.0                                             Flow Length (m)            2%        190           190         0.81         0.81        2.24           2.26          1.1
                                                                                                      KERB FLOW




                                             Fall (m)              11.5                                              Fall (m)                   1%        209           209         0.84         0.85        2.57           2.59          1.1
                                             Flow Time (min)       1.00                                              Flow Time (min)
                                             Multiplier ∆            3                                               Multiplier ∆
                                             Flow Time (min)        3.0                                              Flow Time (min)



                                             Flow Length (m)                                                         Flow Length (m)
                              PIPED FLOW




                                                                                                      PIPED FLOW




                                             Fall (m)                                                                Fall (m)
                                             Flow Time (min)                                                         Flow Time (min)
                                             Multiplier ∆                                                            Multiplier ∆
                                             Flow Time (min)                                                         Flow Time (min)

                                                           Total           15                                                     Total   0




Document Set ID: 23448644
Version: 1, Version Date: 13/01/2025