Refernce Documents - RAL25 0001

                       Peak Discharge Calculations - Total
                       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        23.443        23.579          0        3.40          0.70         0.707
                                                                                                                                                2
                              SHEET FLOW




                                                                                                      SHEET FLOW
                                             Slope (%)             25.0                                              Slope (%)                  3
                                             Flow Length (m)       20.0                                              Flow Length (m)            4
                                             Horton's 'n'          0.045                                             Horton's 'n'               5
                                             Flow Time (min)        6.9                                              Flow Time (min)           Total     23.443        23.579         0          3.40        0.70           0.71


                                                                                                                                                                                    PEAK DISCHARGE CALCULATIONS
                              CHANNEL FLOW




                                                                                                      CHANNEL FLOW
                                             Flow Length (m)       100.0                                             Flow Length (m)                       Rainfall (mm/hr)        Coefficient of Runoff  Peak Discharge (m³/s)
                                             Fall (m)              28.0                                              Fall (m)                  AEP       Existing     Developed    Existing   Developed     Existing     Developed   Difference (%)
                                             Flow Time (min)        0.3                                              Flow Time (min)           63%        64.2          64.2        0.56         0.57        2.34           2.38          1.6
                                             Multiplier ∆            3                                               Multiplier ∆              39%        80.5          80.5        0.60         0.60        3.12           3.17          1.6
                                             Flow Time (min)        0.9                                              Flow Time (min)           18%        99.6          99.6        0.67         0.67        4.31           4.38          1.6
                                                                                                                                               10%        114           114         0.70         0.71        5.20           5.28          1.6
                                                                                                                                                5%        130           130         0.74         0.74        6.22           6.32          1.6
                              CHANNEL FLOW




                                             Flow Length (m)       100.0                                             Flow Length (m)            2%        150           150         0.81         0.81        7.86           7.99          1.6
                                                                                                      KERB FLOW




                                             Fall (m)               9.0                                              Fall (m)                   1%        165           165         0.84         0.85        9.03           9.17          1.6
                                             Flow Time (min)       0.75                                              Flow Time (min)
                                             Multiplier ∆            3                                               Multiplier ∆
                                             Flow Time (min)        2.3                                              Flow Time (min)
                              CHANNEL FLOW




                                             Flow Length (m)       680.0                                             Flow Length (m)
                                                                                                      PIPED FLOW




                                             Fall (m)              18.0                                              Fall (m)
                                             Flow Time (min)       5.00                                              Flow Time (min)
                                             Multiplier ∆            3                                               Multiplier ∆
                                             Flow Time (min)       15.0                                              Flow Time (min)

                                                           Total           25                                                     Total   0




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