UPDATED DA - Attachment 7 - Flood Impact Assessment

     The flood mapping demonstrated that there were no offsite increases in peak water surface level, depth, velocity or
     hazard as a result of the proposed development. Further, as the proposed development area (2.24 ha) is much smaller
     than the overall catchment (287 ha), the minor increase in the fraction impervious has a negligible effect on the overall
     catchment peak discharges, as demonstrated by the flood mapping. Further, as the proposed development has a
     fraction impervious higher than the overall catchment and is located closer to the downstream boundary (outlet) the
     peak discharge will arrive at the outlet much sooner than the overall catchment. Therefore, no detention is required
     for the proposed development.

     Based on a review of the results shown in the flood maps in Appendix C, it can be concluded that the proposed
     development will not create a nuisance or interfere with the use or enjoyment of any land surrounding the proposed
     development site.




Noosa Shire Council                                                                                     10
M25-0045Rpt – 244035– February 2025