Appendix E - Stormwater Management Plan

•        Stormwater Management Construction and Maintenance Plan (SMCMP) Report (No. B14158.W-06A dated
         November 2015);
•        Response to Information Request Letter No. B14158.W-11A dated 22 April 2016; and
•        Queries Clarification Letter (No. B14158.W.14 RFI.AMcP.lms Response to RFI.docx dated 6 June 2016) –
         Addressing Council Officer Cherie O’Sullivan’s further queries in email dated 27 May 2016.

Overall Site Layout - MCU Development Application
• Concept Stormwater Management Plan Report (No. B14158.W-03A dated November 2015);
• Concept Stormwater Management Construction and Maintenance Plan (Concept SMCMP) Report (No. B14158.W-
   09A dated January 2016)
• Response to Information Request Letter No. B14158.W.10A-Response to RFI.docx dated 5 February 2016.
• Outstanding Information Request Response Letter No. B14158.W.10LA.AMcP.ms.docx dated 21 April 2016.

Overall Site Layout – Stage 2 Operational Works Application
• Response to Stormwater Management Approval Conditions Letter (No. 16-001014.01L.ms.cm.docx dated 12
   September 2016) – provides a summary of responses to Council’s Approval Conditions regarding stormwater
   management.
• Stormwater Management Plan (SWMP) Report (No. 16-001014-01A dated September 2016) – provides details of
   the stormwater management strategy, detailed response to Council’s Approval Conditions, with corresponding
   analysis and investigations.
• Stormwater Management Construction & Maintenance Plan (SMCMP) Report (No. 16-001014-02A dated September
   2016) – provides design checklists, construction management and operation maintenance procedures for proposed
   stormwater devices.

The above reports have been considered in the latest analysis.



1.3           RESPONSE TO APPROVAL CONDITIONS
A summary of the responses to Council’s Approval Conditions relating to stormwater management are provided in
Table 1-1 below. Some responses have been addressed in other submissions, such as the SMCMP Report
(No. 16-001014-02B dated January 2017).

Table 1-2: Summary of Responses to Approval Conditions Relating to Stormwater Management
    Item      Brief Summary of Item                    Response to Item
    59        Adequate flood immunity maintained       Design of roadworks and drainage network throughout the site ensures
              during local and regional events.        adequate management of local flows. Refer to Roadworks and
                                                       Drainage Plans. Section 3.2.6 in this report indicates basin water
                                                       surface levels provide adequate freeboard to allotment levels.
                                                       Section 1.1 in this report provides details of regional flood levels below
                                                       developed lots.
    60        Site earthworks does not adversely       Section 1.1 in this report provides details of regional flood levels
              impact flood conditions on adjacent or    and site filling well outside of regional flood extents.
              downstream properties                    Furthermore, Section 3.2.6 indicates a reduction of peak flows back to
                                                       or below existing levels discharging from the site, which demonstrates
                                                       no adverse impact to flooding downstream.
    61        Design of stormwater drainage and        Stormwater drainage and basin detailed design drawings have been
              management devices to be certified by    certified by RPEQ. Refer to Drawing No. 16-001014-400 series for
              RPEQ specialising in hydraulics.         details.
    62        Minor Drainage System Capacity – 10%     Stage 2 Operational Works drainage has been designed accordingly.
              AEP storm, Major Drainage System         Refer to Stage 2 Operational Works Design Package for details. Future
              Capacity – 1% AEP storm                  stages will also be designed accordingly. Details are also provided in
                                                       Section 3.2.8 of this report.
    63        No adverse impact to downstream peak     Section 3.2.6 in this report demonstrates that proposed detention
              flows up to and including the 1% AEP     basins are adequate in reducing peak flows to meet this requirement.
              Storm



16-001014-01B | STORMWATER MANAGEMENT PLAN                          COOROY RETIREMENT COMMUNITY, TRADING POST
(SWMP) | PALM LAKE RESORTS                                                                      ROAD, COOROY                        |3