MCU14/0056 Stormwater Quantity Management Plan Att D Information response

2.0      RESPONSE TO INFORMATION REQUESTS
 2.1     Department of Main Roads Information Request
       A response to each item from the Department of Main Road’s Information Request dated 13
       August 2014 is presented below.

       RFI Item
       The stormwater management plan must be certified by a Registered Professional Engineer
       of Queensland.

       SWC Response
       This stormwater management plan has been certified by a Registered Professional Engineer
       of Queensland – Darren Rogers (RPEQ 5016).


       RFI Item
       The stormwater management plan must be prepared in accordance with the Department of
       Transport and Main Roads ‘Drainage Manual and with consideration given to the
       Queensland urban Drainage manual 2013 and the Environmental Protection Act 1994 and
       Environmental Protection (Water)Policy 2009.

       SWC Response
       This stormwater management plan has been prepared in accordance with the stated manuals.


       RFI Item
       Demonstrate that the management of stormwater (quantity and quality) post development
       can achieve a no worsening impact (on the predevelopment condition) in accordance with
       the design criteria in the Department of Transport and Main Roads’ Road Drainage
       Manual. Stormwater management for the proposed development must ensure no worsening
       or actionable nuisance to the state controlled road network caused by peak discharges,
       flood levels, frequency/duration of flooding, flow velocities, water quality, sedimentation,
       and scour effects.

       SWC Response
       This stormwater management plan demonstrates that the development will not result in
       adverse impact on properties and roads that are upstream, downstream and adjacent to the
       subject site. The development does not worsen or cause an actionable nuisance to the state
       controlled road networks.

       RFI Item
       Incorporate appropriate hydraulic and hydrological analysis demonstrating:
        • design flood peak discharges for the site and surrounding area which exist prior to the
           development for all flood and stormwater events up to a 1% Annual Exeedance
           Probability (AEP) (equivalent to 1/100 year Average Recurrence Interval (ARI)). This
           should include at least the following flood and stormwater events: 50%, 20%, 10%, 5%,
           2% and 1% AEP (equivalent to 2, 5, 10, 20, 50 and 100 year ARI events); and


                                       J4279 Report 1.0.doc
                                         14 January 2015                                     Page 3