Callaghan and Toth IWMP Report revised

                                                                                Callaghan & Toth


1.       SUMMARY
The key points of this investigation are as follows:

     1. Roof water runoff is to be collected in six rainwater tanks and recycled to provide
        potable water to toilets and hose cocks for gardens.
     2. Runoff from new access roads, car parks and landscaped areas around the buildings is
        to be cleaned of nutrients and gross pollutants via Detention System, Gross Pollutant
        Traps, and two Biopods. Treated runoff is then released to existing outlets into adjacent
        vegetation.
     3. The increase in pollutant loads due to the increase in impervious areas is to be
        attenuated.
     4. Water saving devices for new fixtures are required.
     5. The increase in runoff is attenuated by two underground detention/infiltration storage
        systems (ecoAID).


2.       INTRODUCTION
This Integrated Water Management Plan (IWMP) is to be submitted with a Changes Application
to Noosa Council to amend an existing approval for the development of the Carramar –
Cartwright Village Extension. This IWMP and is in accordance with:
    1. Water Sensitive Design Code in the Noosa Plan
    2. The latest Water Sensitive Urban Design Technical Design Guidelines for South East
        Queensland, published by Health Waterways

The site subject to this report is Lot 2 RP177554 at Cooroy Noosa Road, Tewantin (refer Site
Location Plan Figure 1.1). The current uses on site include landscaped areas and adjacent
bushland.

The IWMP relates to new Villas, access roads, carparks, entry building, pathways and
landscaping for the proposed Cartwright Village Extension at Carramar, Cooroy Noosa Road,
Tewantin.

There is a total new roof area of 1674m2 for the Villas building and Entry building that flows to
six rainwater tanks, and a total area of access roads and car parks, pathways and landscaped
area of 1909m2 that flows to Gross Pollutant Traps, two detention systems, and then to two
Biopods.

In order to receive planning approval from Noosa Council, this site must demonstrate that it
complies with Council’s Water Sensitive Design Code and that the storm water runoff will not
change the surrounding hydrology. Biopods infiltration, detention systems (ecoAID), Gross
Pollutant Traps (Fox GPT), and above ground roof water tanks are required for the site. These
devices will enable the water quality objectives to be achieved. Water reuse and water use
minimisation are in accordance with the guidelines.

The Model for Urban Stormwater Improvement Conceptualization (MUSIC) has been used to
assess the suitability of various treatment devices and to model existing and predicted pollution
export loads and concentrations.




                                                                                                    5
1714-Cartwrigth Village Extension_IWMP_Revision 3.doc                           April 2019