16-001014-02A (Ultimate SCMMP)

2            WQCP - DESIGN, CONSTRUCTION, OPERATIONAL
             MANAGEMENT & MAINTENANCE
The following sections discuss the design, construction and operational management and maintenance measures for the
proposed Water Quality Control Pond (WQCP), incorporated within the Central Basin (which includes the Central
Bioretention Basin and Central Pond). These measures take into consideration general management and the
management of mosquitoes and cyanobacterial blooms during each phase of the development. This is in accordance
with the approved Framework Letter Report (No. B14158.W.07L dated 8 October 2015), as per the approval conditions
indicated in Council’s Decision Notice (dated 22 July 2016). While the structure of the report may vary slightly from the
Framework Letter Report (2015), all design features and management measures identified in the Framework Letter
Report (2015) have been implemented in this report.

Detailed design drawings for the Central Basin (Bioretention Device and WQCP) are provided in Appendix D. Refer to
the SWMP Report (No. 16-001014-02A dated September 2016) for details of the overall stormwater quality management
strategy for the site.

2.1          DESIGN PHASE
Design objectives for the Central Pond are detailed in the Framework Letter Report (No. B14158.W.07L dated 8 October
2015). Design details are indicated on Drawing Series No. 16-001014-400 provided in Appendix D.

2.1.1        GENERAL MANAGEMENT

The central WQCP has been designed in accordance with the design checklist specified below:

     Healthy Waterways – WSUD Technical Design Guidelines for South East Queensland (2006) design assessment
      checklists for WQCPs. Not all WQCP items in this checklist were applicable, such as those for the Inlet Zone,
      however the relevant objectives have been achieved. A design checklist for the WQCP has been completed and is
      provided in Appendix A.

2.1.2        MOSQUITOES

As per the Letter Report (No. B14158.W.07L dated 8 October 2015) design has accounted for the management of
mosquitoes as per Section 6.2.8 - “Designing to Avoid Mosquitoes” in WSUD Technical Design Guidelines for South East
Queensland (2006). This Heathy Waterways document outlines a number of design features that may be implemented to
reduce the risk of high mosquito populations. The following design features have been implemented in the Central
WQCP:

Table 2-1: Design Features for Mosquito Prevention
    Design Feature                                          WQCP Details
    Access for mosquito predators, such as fish and         Drawing No. 16-001014-400 Series in Appendix D indicates
    predatory insects, provided to all parts of the water   connectivity between each deep water zone within the
    body by avoiding stagnant isolated areas of water.      WQCP to avoid stagnant isolated areas of water.
    Deep open water zones provided within the WQCP to       As indicated on Drawing No. 16-001014-400 Series in
    provide refuge for mosquito predators during dry        Appendix D there are two deep open water zones, providing
    seasons of rainfall.                                    sufficient habitat for mosquito predators.
    Bathymetry of the WQCP is provided such that            The proposed WQCP has been designed with effective
    regular wetting and drying is achieved in a way that    bathymetry that ensures regular wetting and drying and even
    promotes an even distribution of water drawdown and     drawdown of water, as indicated on Drawing No. 16-001014-
    minimises isolated pools.                               400 Series in Appendix D. There are three outlets into the
                                                            basin which allows for an even distribution of flows
                                                            throughout the WQCP. The balance pipe between the deep
                                                            open water zones will also ensure even drawdown.




16-001014-02A | SMCMP | PALM LAKE RESORTS                           COOROY RETIREMENT COMMUNITY, TRADING POST
                                                                                                ROAD, COOROY              |3