2160 IWMP Report_Jan2022

                                                                                 Callaghan & Toth

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

     1. The NoosaCare Kabara site proposes to demolish the existing Kauri Building and
        construct a new 2-storey building within a similar footprint as the existing building.
     2. This will result in an increase in roof area of 544m2 and an additional 15 toilets in the
        new building, compared to the existing building.
     3. The increase in pollutant loads due to the increase in impervious areas (I.e. increased
        roof area of Kauri Building) is to be attenuated.
     4. Water saving devices for new fixtures are required.
     5. Roof water runoff is to be recycled to provide Potable water to toilets and hose cocks.
     6. The existing stormwater treatment system with the addition of one 24,000 litre rainwater
        tank will be sufficient to achieve the required stormwater quality pollutant load reduction
        targets, from any increases in pollutant load associated with the new Kauri Building
        proposed for the site. The existing biobasin and bioswale do not need to be increased
        in size to achieve the water quality targets.
     7. The changes affect the stormwater detention requirements on site, and the installation of
        two (2) x 4,000 litre stormwater tanks is adequate to attenuate flows to pre-development
        conditions.


2.        INTRODUCTION
This Integrated Water Management Plan (IWMP) report is supporting documentation for the
Changes Application relating to MCU13/0030.01 Multiple Housing Type 3 Retirements and
Special Needs for an additional 12 beds located at 20 Topaz Street, Cooroy – NoosaCare
Kabara site.

This IWMP is prepared for the MCU Changes application for Noosa Council, 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 102 on SP236318 located at 20 Topaz Street, Cooroy
(Refer Site Location Plan Figure 1.1).

The IWMP considers the renewal of the Kauri Building and any associated hardstand areas.
The existing Kauri building roof area is approximately 2000m2, while the proposed Kauri
Building roof area is 2,544m2; this is an increase of 544m2. The existing total roof area that was
modelled in 2013 was 3,574m2 (which included the Cedar Building) and as such the new area
used in the MUSIC model is 4,118m2.

The existing hardstand areas are not proposed to change in area, that is the associated access
road, carparks and footpaths, and as such the total area remains the same at 958m2.

In order to receive planning approval from Noosa Council for the changes proposed on site (i.e.
increase in area of Kauri building), the site must demonstrate that it complies with the Integrated
Water Management Guidelines and that the storm water runoff will not change the surrounding
hydrology.

                                                                                                 5
2160, Kabara Upgrade, Cooroy             IWMP.doc                              January 2022