Refernce Documents - RAL25 0001

                                       Table 5.2-4 Rational Method vs XP-Storm - Continued
                        Catchment      AEP     RM Pre    XP Pre   Difference   RM Post   XP Post   Difference
                                       63%      0.40      0.33       -0.07      0.40      0.33        -0.07
                                       39%      0.54      0.51       -0.03      0.54      0.51        -0.03
                                       18%      0.74      0.76        0.02      0.74      0.76         0.02
                             7         10%      0.89      0.89        0.00      0.89      0.89         0.00
                                        5%      1.06      1.10        0.04      1.06      1.10         0.04
                                        2%      1.33      1.33        0.00      1.33      1.33         0.00
                                        1%      1.52      1.53        0.01      1.52      1.53         0.01


                     The discharge results of the calibrated nodes are comparable to the Rational Method
                     calculations for each storm event examined and the model is considered appropriate for
                     use.



                     5.2.2 Model Results

                     The XP-Storm mean ensemble storm results have been compared for the post
                     development and pre developed scenarios.


                     Table 5.2.2-1 shows the pre development discharges for each of the modelled AEP
                     storm events and durations downstream of the Hoy Rd causeway crossing. The critical
                     peak discharge is highlighted for ease of reference. Table 5.2.2-2 shows the post
                     developed results following the propose works to the causeway.




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Document Set ID: 23448644
Version: 1, Version Date: 13/01/2025