RFI - SWMP.pdf

STORMWATER RUNOFF ASSESMENT
Noosa Site

Calculates existing and developed flow rates in accordance with QUDM
2017 for sites located in Noosa

Address                         89-93 Eumundi Noosa Rd    Site Area                   4150      m2
SCG Job No.                     31131


                                                 Pre Development                                                                                                    Post Development
           Sub-catchment A                                             Sub-catchment B                                            Sub-catchment A                                            Sub-catchment B
                                                   2                                                          2                                                       2
Pervious Area                              278    m       Pervious Area                              3397    m      Pervious Area                             234    m        Pervious Area                              575    m2
Impervious area                            210    m2      Impervious area                             265    m2     Impervious area                           936    m2       Impervious area                           2305    m2
                        TOTAL              488    m2                              TOTAL              3662    m2                             TOTAL            1170    m2                               TOTAL             2880    m2


STORM DATA                                                STORM DATA                                                STORM DATA                                                STORM DATA
Time of Concentration                        5    min     Time of Concentration                        13    min    Time of Concentration                       5    min      Time of Concentration                     5.67    min
I 10                                       226   mm/hr    I 10                                        164   mm/hr   I 10                                      226   mm/hr     I 10                                       220   mm/hr
fi                                        0.43            fi                                         0.07           fi                                       0.80             fi                                        0.80
C 10                                      0.78            C 10                                       0.74           C 10                                     0.88             C 10                                      0.88

                  Frequency                                                 Frequency                                                 Frequency                                                 Frequency
ARI (years)                          Cy           Iy      ARI (years)                           Cy           Iy     ARI (years)                        Cy            Iy        ARI (years)                        Cy            Iy
                  Factor (Fy)                                               Factor (Fy)                                               Factor (Fy)                                               Factor (Fy)
     1                0.8          0.624          124          1                0.8           0.592          93          1                0.8        0.704           121           1                0.8         0.704           124
     2               0.85          0.663          141          2               0.85           0.629          105         2               0.85        0.748           138           2               0.85         0.748           141
     5               0.95          0.741          192          5               0.95           0.703          141         5               0.95        0.836           187           5               0.95         0.836           192
    10                 1           0.78           226         10                 1            0.74           164        10                 1         0.88            220          10                 1          0.88            226
    20               1.05          0.819          259         20               1.05           0.777          186        20               1.05        0.924           252          20               1.05         0.924           259
    50               1.15          0.897          301         50               1.15           0.851          214        50               1.15          1             292          50               1.15           1             301
    100               1.2          0.936          332         100               1.2           0.888          234        100               1.2          1             322          100               1.2           1             332

              Q = C x I x A / 360

       Q - Pre-Development A                                      Q - Pre-Development B                                       Q - Post-Development A                                     Q - Post-Development B
    ARI            Qy (m3/s)      Qy (Lt/s)                   ARI            Qy (m3/s)       Qy (Lt/s)                  ARI            Qy (m3/s)    Qy (Lt/s)                      ARI           Qy (m3/s)     Qy (Lt/s)
     1              0.010          10.5                        1              0.063           63.5                       1              0.028        27.7                           1             0.070         69.8
     2              0.013          12.7                        2              0.076           76.1                       2              0.034        33.5                           2             0.084         84.4
     5              0.019          19.3                        5              0.114            114                       5              0.051        50.8                           5             0.128          128
     10             0.024          23.9                        10             0.140            140                       10             0.063        62.9                           10            0.159          159
     20             0.029          28.8                        20             0.167            167                       20             0.076        75.7                           20            0.191          191
     50             0.037          36.6                        50             0.210            210                       50             0.095        94.9                           50            0.241          241
    100             0.042          42.1                       100             0.240            240                      100             0.105         105                          100            0.266          266