Swmp

               Rational Method Calculations

                  Job Number            2308        IFD              NOOSA           NEW IFD

                    Address        2 Bottlebrush Ave, Noosa Heads            By         JL


               Existing Case                                                      Proposed Development Case

               Catchment Details                                                  Catchment Details
                     Area             0.05464       ha                                  Area            0.05464      ha
                       fi               0.79                                              fi              0.73
                     C10               0.858                                            C10              0.846
                      I10               74.2       mm/hr                                 I10              74.2     mm/hr

               Standard Inlet Time                                                Standard Inlet Time
                     Time                5         mins                                 Time              5         mins


               Peak Discharge Calculations

               Existing Case                                                      Proposed Development Case

Design
                                     Frequency
Storm              Area (ha)                        Cy      Iy (mm/h) Qy (m3/s)       Area (ha)           Cy      Iy (mm/h)   Qy (m3/s)
                                     Factor (Fy)
(AEP)
 63%       1        0.05464             0.80       0.6864      125       0.013        0.05464           0.6768      125        0.013
 39%       2        0.05464             0.85       0.7293      151       0.017        0.05464           0.7191      151        0.016
 18%       5        0.05464             0.95       0.8151      188       0.023        0.05464           0.8037      188        0.023
 10%      10        0.05464             1.00       0.858       226       0.029        0.05464            0.846      226        0.029
  5%      20        0.05464             1.05       0.9009      258       0.035        0.05464           0.8883      258        0.035
 2%       50        0.05464             1.15       0.9867      301       0.045        0.05464           0.9729      301        0.044
 1%      100        0.05464             1.20         1         334       0.051        0.05464             1         334         0.051