RFI - Stormwater management (flood report)

      Table 2-10: 1% AEP Flood Storage Comparison.

       Scenario                     Flood Plain Storage (m3)                Balance
       Existing                                    7,877
       Proposed (no cut)                           7,750                               127m3 loss
       Proposed (with cut)                         7,899                              +22m3 gain

      2.2.3.4. Flood Immunity

      The NSC Planning Scheme identifies the Defined Flood Event, from which freeboard is set is
      the 1% (2100) AEP flood event. Flood levels around the site for the 1% (2100) AEP are detailed
      for various reporting locations as shown in Figure 2-3. This shows the proposed new lots are
      above the 1% (2100) AEP peak flood levels with a small drainage swale in Lot 10 to ensure
      conveyance the flow path was maintained to not cause worsening on the upstream
      property. The peak flood level, minimum finished flood level and proposed lot level is shown
      in Table 2-11. It is seen that greater than 500mm freeboard is provided to lot. It is
      recommended that future buildings on each lot achieve a minimum of 500mm freeboard
      above the regional 1% (2100) AEP flood level.
      Table 2-11: Lot Levels Compared to Adjacent 1% AEP Peak Flood Levels
       Lot        1% AEP Peak Flood          Minimum                  Min Finished Floor   Proposed Min Lot
                  Level (m AHD)              Freeboard to Floor       Level (m AHD)        Level (m AHD)
                                             (m)
       5                   85.11                      0.5                   85.61               86.50
       6                   83.60                      0.5                   84.10               86.65
       10                  85.11                      0.5                   85.61               86.80




      Figure 2-3: 1% (2100) AEP Peak Water Surface Elevation Reporting Locations




21-0166SMP01-V1 | Stormwater Management Plan | 25 Pavilion Street, Pomona                                     | 13