Civil Engineering Onsite Effluent Assessment · MCU13/0064

               Table 1: Calculated Hydraulic Wastewater Flows from DEHP (formerly DNR&M)
                                                                        Daily Sewage
                                                         Rooms per                          Total Daily Sewage             Adopted Total
          Item             Source          Quantity                    Flow per Room
                                                          Structure                            Flow (L/day)                 Flow (L/day)
                                                                           (L/day)
           1            Bungalow(s)            3              2           300 – 6001            900 – 1 800                    1,350
           2            Long House             1              4          225 – 4502             900 – 1 800                    900
                           Onsite
           3             Caretaker’s           1              1          225 – 4502              225 – 450                     225
                       Residence (Two
                       Resident Staff)
                       Additional Staff
           4           Accommodation           1              1          225 – 4502              225 – 450                     225
                         (Two Staff
                         Members)
                                                                                                      Total (L/day)            2,700
               Note: 1Flow per person based on two (2) bedroom Apartment/Home Unit with reticulated water supply
                      2Flow per person based on one (1) bedroom Apartment/Home Unit with reticulated water supply




               The hydraulic loading associated with the non-resident staff population can be
               most reliably calculated using the DEHP (formerly DNR&M) Determining
               Capacity of Sewage Treatment Plants Based on Use Conditions, as follows:

               Table 2: Calculated Hydraulic Wastewater Flows from DEHP (formerly DNR&M)

                                                                                                        Total Daily Sewage Flow
               Item              Source              Population          Flows (L/day/pp)
                                                                                                                 (L/day)
                           Non-Resident Staff
                  1       Member (E.g. General            1                     301                                   30
                               Manager)
                             Non-Resident
                  2          Cleaning Staff               2                     15                                    30
                               Members

                                                                                      Total (L/day)                   60
                      1Flow per person based on Non-Resident Staff at Hotels/Motels type facility



               Based on the above references, a total hydraulic loading of 2,760 litres per day
               (14EP) can be estimated for the guest and staff accommodation
               facilities/population at the Makepeace Island accommodation facility.
               On-Site Wastewater Land Application Area

               Effluent irrigation currently occurs via subsurface dripper lines within the existing
               raised garden beds, totalling 540m2.

               Based on the estimated hydraulic loading of 2,760L/day, the required effluent
               irrigation area can be determined using Design Irrigation Rate (DIR) calculation
               as set out in Table M1 of AS1547:2012.


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