Compiled Reference Documents - MCU24/0153 & OPW24/0202

    9 hour                                      12.6      14.64       21.36       26.16     31.08   37.8     43.08

    12 hour                                     10.536    12.36       18.12       22.32     26.52   32.28    36.84

    18 hour                                     8.22      9.624       14.28       17.64     21      25.68    29.52

    24 hour                                     6.852     8.04        11.952      14.76     17.76   21.84    25.08

    30 hour                                     5.94      6.96        10.38       12.84     15.48   19.08    21.96

    36 hour                                     5.256     6.168       9.216       11.448    13.8    17.04    19.68

    48 hour                                     4.32      5.064       7.572       9.444     11.4    14.16    16.44

    72 hour                                     3.216     3.768       5.652       7.068     8.568   10.776   12.6

    96 hour                                     2.592     3.024       4.536       5.676     6.912   8.712    10.224

    120 hour                                    2.172     2.544       3.804       4.764     5.796   7.32     8.592

    144 hour                                    1.884     2.196       3.276       4.104     4.992   6.288    7.38

    168 hour                                    1.668     1.944       2.892       3.612     4.38    5.508    6.444




The below table shows the climate change adjusted Pre-Development Catchment Runoff estimations
provided in the original SCCE SMP prepared in November 2024.

Table 3: Predevelopment site discharge (m3/s)

                           Flow Event                   Existing Scenario(m³/s)
                         Q10 (10% AEP)                           0.040
                          Q1 (1% AEP)                            0.062
The following unmitigated post-development flow results were derived from the 12d model which
was run with the climate change adjusted rainfall data in Table 2 Above.

Table 4: Unmitigated post-development site discharge – adjusted for climate change (m3/s)

                             Flow Event             Climate Change Incl. (m³/s)
                          Q10 (10% AEP)                       0.050
                            Q1 (1% AEP)                       0.084
The following mitigated post-development flow results were achieved with the use of an onsite
detention tank

Table 5: Mitigated post-development site discharge -adjusted for climate change (m3/s)

                                    Flow Event                        Climate Change Incl. (m³/s)
                                   Q10 (10% AEP)                                0.035
                                    Q1 (1% AEP)                                 0.057




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