RFI Eng response notice items 4-19 MCU150111

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

                                                                      Site flows and Farm Dam fill times
                                  1.4




                                  1.2




                                   1
         1yr ARI Flows (cumecs)




                                  0.8




                                  0.6




                                  0.4




                                  0.2




                                   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):                                         0.50                         0.40                      0.33                    0.47                  0.48
Total Flow Volume (ML):                                          65                       407                       192                     181                   516
Est. Dam Volume as % of
                                                             2.1%                     0.5%                         0.3%                     0.9%                  1.1%
Design Storm Flow Volume