1909-13367 SRA referral response approved docs

     Table 4 – Detention details

                Characteristic                                          Detail

          Elevation vs detention area                             Basin 1 (LPOD 1)
                                                       104.80m AHD – 1m2 – Orifice Invert Level
                                                        106.30m AHD – 2m2 – Top of Field Inlet
                                                               106.301m AHD – 550m2

                                                     107.30m AHD – 890m2 – Basin Overflow Level


                                                                  Basin 2 (LPOD 2)
                                                       107.80m AHD – 1m2 – Orifice Invert Level
                                                        108.90m AHD – 1m2 – Top of Field Inlet
                                                               108.901m AHD – 500m2

                                                    110.20m AHD – 1,500m2 – Basin Overflow Level


                                                                  Basin 3 (LPOD 3)
                                                       107.80m AHD – 1m2 – Orifice Invert Level
                                                        108.90m AHD – 1m2 – Top of Field Inlet
                                                               108.901m AHD – 500m2

                                                     110.08m AHD – 600m2 – Basin Overflow Level

                Outlet details                 Basin 1 – 2 x outlets (610mm Ø orifice onto 825mm Ø RCP)
                                                         Highflow Weir – [email protected] AHD


                                                     Basin 2 – 160mm Ø orifice onto 225mm Ø PVC
                                                         Highflow Weir – [email protected] AHD


                                                    Basin 3 – 415mm Ø orifice onto 600mm Ø RCP
                                                         Highflow Weir – [email protected] AHD

   Q100 Water Level and OSD Volume            Basin 1 Peak Water Level –107.46m AHD_0.16m above top of
                                                                         weir
                                                  Q100 Detention Volume = 720m3 @ peak water level

                                              Basin 2 Peak Water Level – 109.94m AHD_0.26m below top of
                                                                          weir
                                                  Q100 Detention Volume = 1200m3 @ peak water level

                                             Basin 3 Peak Water Level – 110.22m AHD_0.14m above top of
                                                                         weir
                                                  Q100 Detention Volume = 286m3 @ peak water level




                                        Stormwater Management Report                                      10
S19-007                                   122 & 144 Myall St, Cooroy