Development Application part 2 of 2 Report and Plans MCU13/0030

                                                                                              ~
                                                                                         Callaghan & Toth

5        WATER CYCLE MANAGEMENT PLAN

         This development has been designed to ’Complying Solutions’ for Water Cycle
          Management.

         To this end, 100% of the new roof area of 3,570m2 on the site will be connected to two
          rainwater tanks. The tanks will have a capacity of 46,000 litres (two x 23,000 litre tanks)
         which is in excess of the complying solutions requirement.


         The rainwater tanks will supply water to cold water washing machine supply, toilet
         flushing and hose cocks adjacent the building for hand watering of landscaping.

          For landscaping the Water by Design Guidelines specify ([1030m2xO.53m = 546 KUyr] +
          364   =
                    1,500 L/day) for the new landscaped areas to be irrigated on site.

         The tanks sizing can be 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
          1500Upedestal (toilet) @ 23 toilets    =
                                                     34,500L

          10 Day Demand Check


          Landscape Area      =
                                  (1,030m2xO.53m)+ 364 x 10 days demand        =
                                                                                   15,000L for irrigation.

         Total Storage for 10 day Supply = 34,500 + 15,000       =
                                                                     49,500L

          It is therefore recommended that a minimum of 46,000 litres of rainwater storage for
         toilet flushing, cold water washing machine and irrigation be provided on site.


6         FLOODING ASSESMENT REPORT

          6.1        Existing Conditions

          This site is subject to ponding of floodwaters from the adjacent channels and the Q1 00
          year ARI flood levels. The habitable floor areas of the new buildings and new carpark
          are above the Q100 year ARI flood levels.



          6.2        Proposed Drainage System

          The carpark surface level is proposed to be drained to an underground drainage system
          capable of taking a Q2 flow. The overflow will discharge to the existing car park and
          surrounding vegetated Bio-Swale.

          The habitable minimum floor level for the proposed centre is to be set at RL 107.20. The
          minimum carpark level is RL 106.30, which is not affected by the Q100 flood level. The
          applicant’s supplied flood certificate and gives a minimum Q1 00 flood level of RL105.23
          AHD and a minimum floor level of RL106.7 AHD.


                                                                                                             16
1303, Kabara Hostel, Cooroy                  IWMP.doc                                   January 2013