H - Revised Integrated Water Management Plan by Cardno (inc MUSIC file) (13.09.19)

                                                                                 Integrated Water Management Plan
                                                                         Noosa Marketplace : 2-20 HOFMANN DRIVE



Either provide further justification or revised initial loss values for the pre-development pervious areas.
Reference should be made to ARR2016 and the ARR Datahub and the discussion in QUDM Section 5.6.1.
Hydraulic modelling and impact assessments should also be revised accordingly.
Demonstrate the modelling has considered the external catchments to the north and west of the site.
To the north
        Eenie Creek Road formation and Easement T on SP182880.
        Eenie Creek service road adjacent to the northern property boundary.
To the west.
        Commerce Court – through No 3 Commerce Court and Easement G on RP230888.
Response
Hydraulic modelling has been revised based on ARR2019 and QUDM Section 5.6.1.
It should be noted that QUDM 2017 states to refer to the latest ARR version for guidance regarding initial and
continuing losses.
Catchments used to calculate flows in the hydrological model are shown in Figure 4-1. Catchments to the west
and north of the site mentioned above are clearly shown in Figure 4-1. The larger external catchments to the
north and north west follow the existing flow paths where available and the proposed flow path as detailed in
Section 7.4.3.. The smaller catchments directly west of the proposed development have been included in the
detention storage modelling with the assumption that flows from these smaller areas will be captured by onsite
drainage. It should be noted that Council has a drainage network already installed at these locations as shown
below. Modelling has been performed with this network removed as its effectiveness is unknown.




V190428 | 10 September 2019 | Commercial in Confidence                                                         5