Refernce Documents - RAL25 0001

                       Peak Discharge Calculations - CMT 6
                       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         2.502         2.502          0        10.49         0.70         0.721
                                                                                                                                                2
                              SHEET FLOW




                                                                                                      SHEET FLOW
                                             Slope (%)             10.0                                              Slope (%)                  3
                                             Flow Length (m)       20.0                                              Flow Length (m)            4
                                             Horton's 'n'          0.035                                             Horton's 'n'               5
                                             Flow Time (min)        6.4                                              Flow Time (min)           Total      2.502         2.502         0         10.49        0.70           0.72


                                                                                                                                                                                    PEAK DISCHARGE CALCULATIONS
                              CHANNEL FLOW




                                                                                                      CHANNEL FLOW
                                             Flow Length (m)       150.0                                             Flow Length (m)                       Rainfall (mm/hr)        Coefficient of Runoff  Peak Discharge (m³/s)
                                             Fall (m)              19.10                                             Fall (m)                  AEP       Existing     Developed    Existing   Developed     Existing     Developed   Difference (%)
                                             Flow Time (min)       0.90                                              Flow Time (min)           63%        85.2          85.2        0.56         0.58        0.33           0.34          3.0
                                             Multiplier ∆            3                                               Multiplier ∆              39%        107           107         0.60         0.61        0.44           0.46          3.0
                                             Flow Time (min)        2.7                                              Flow Time (min)           18%        132           132         0.67         0.68        0.61           0.63          3.0
                                                                                                                                               10%        151           151         0.70         0.72        0.73           0.76          3.0
                                                                                                                                                5%        171           171         0.74         0.76        0.87           0.90          3.0
                              CHANNEL FLOW




                                             Flow Length (m)       50.0                                              Flow Length (m)            2%        196           196         0.81         0.83        1.10           1.13          3.0
                                                                                                      KERB FLOW




                                             Fall (m)              0.50                                              Fall (m)                   1%        215           215         0.84         0.87        1.26           1.29          3.0
                                             Flow Time (min)       1.50                                              Flow Time (min)
                                             Multiplier ∆            3                                               Multiplier ∆
                                             Flow Time (min)        4.5                                              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           14                                                     Total   0




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