1714 IWMP_Report_Carramar_Version2 Oct 2018

                                                                                    Callaghan & Toth


5        WATER CYCLE MANAGEMENT PLAN
This development has been designed to in accordance with the ‘Deemed to Comply Solutions –
Stormwater Quality Management (SEQ) May 2010’ and the Queensland Development Code
MP 4.3.

To this end, 100% of the new Villa’s and entry building roofs on the site will be connected to
rainwater tanks, therefore seven tanks will be provided. The tanks will each have a capacity of
14,000 litres, which is in excess of the complying solutions requirement.

The rainwater tanks will supply water for toilet flushing and hose cocks adjacent the building for
irrigation of adjacent landscaping, and tank sizing will be based on:

    •    Each villa contains 8 pedestals.
    •    Entry building has 3 pedestals.
    •    The size of the landscaped areas of extension works that will be irrigated is 1,165m2.

The tanks sizing has been checked in accordance with the Queensland Development Code
MP4.3 per compliance with storage for toilet flushing and Water by Design Music Guidelines
Version 1 December 2010 for storage for irrigation of landscaping to Commercial sites.

Complying Solution 1:

Queensland Development Code MP4.3 per compliance with storage for toilet flushing details
that rainwater tanks have a minimum storage capacity of 1,500 litres per required pedestal and
any additional capacity as specified in Appendix B of the QDC. As such the following
calculations are offered:

         MINIMUM STORAGE CAPACITY:

         Per Villa: 8 pedestals x 1500L/pedestal (toilet) = 12,000L / villa
         Entry building: 3 Pedestals x 1500L/ Pedestals (toilet) = 4,500L Entry

         For landscaping the water by design guidelines specify:

         Annual demand = irrigated area 1,165 m2 x 0.548m/year = 638.75KL/yr

         Daily demand = Annual demand /365 = 1,750L/day

         10 day demand = 1,750L/day x10 days = 17,500L

         Total Storage required on site for 10 day Supply = (12,000L x 4) + 4,500L + 17,500L
                                                          = 70,000L

It is recommended that a minimum of 5 tanks, each with 14,000 litres of rainwater storage for
toilet flushing, and landscape irrigation be provided giving a total of 70,000 litres of storage.




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1714-Cartwrigth Village Extension_IWMP_Version2.doc                               October 2018