RFI Eng response notice items 4-19 MCU150111

                                                                                                                                                            Attachment 1
15‐003352 ‐ Palm Lake, Cooroy
Existing 100yr ARI conditions (RAFTS Model) and influence of existing farm dams on catchment hydrology

                                                                     Site flows and Farm Dam fill times
                                    6




                                    5




                                    4
         100yr ARI Flows (cumecs)




                                    3




                                    2




                                    1




                                    0
                                        0             0.5                  1                      1.5                     2                   2.5                  3
                                                                                              Time (hrs)

                                            A2   B4   B3    C2       OUT       N Basin          Centre Basin       Centre South Basin      South Basin   TOTAL

                                                                                                               Centre South
Dam                                                         N Basin             Centre Basin                                            South Basin          TOTAL
                                                                                                                  Basin
Weir level (mAHD)                                            99.75                   98.75                        99.75                   102.75                  -
Bund level (mAHD)                                           100.25                       99                        100                     103                    -
Dam Area (m2)                                                 888                    1246                          415                     1066                  3615
Estimated Dam Volume (ML)
                                                             1.345                   2.001                        0.544                    1.625             5.515
(Assumes 2m depth; 1:2 batters)
Model Output Location                                       Node A2                Node B4                       Node B3                 Node C2                 OUT
Dam fill time (hrs):                                         0.30                        0.23                      0.18                    0.27                  0.28
Total Flow Volume (ML):                                       180                    1127                          536                     487                   1437
Est. Dam Volume as % of
                                                             0.7%                    0.2%                         0.1%                     0.3%                  0.4%
Design Storm Flow Volume