STP22-0347 DA Engineering Report RFI Response Rev C

                                                                                                    STP CONSULTANTS



         The rear access track will consist of a 5.0m wide gravel formation of 200mm crushed rock base over a trimmed
         and compacted subgrade. The profile will consist of a 4% one-way crossfall, 4.0m wide with 0.5m shoulders,
         designed to be free-draining. The two crossing points will be constructed as rock causeways for unobstructed
         overland flow. Typical details are included in Appendix B.

         Manning’s trapezoidal channel calculations are shown below, indicating a rock size in the range 30-50mm for the
         calculated maximum velocity of 0.79m/s at the AEP 1% event.




        Figure 3.6 – Proposed earthworks and fire track schematic layout (STP). Refer Appendix A.


Civil Engineering Report & Site Based Stormwater Management Plan | STP22-0347                                      9