Appendix G Water and Sewer Analysis

                       WATER SUPPLY AND SEWER NETWORK ANALYSIS
Client: Noosa Shire Council                        Location: 62 Lake Macdonald Drive, Cooroy

the DMA, excluding the failing nodes, the service pressure is above 22m and is therefore
considered to be acceptable.


                            Table 3 –Peak Hour Pressure Analysis Results
                                                        Pressure (m)
               Year        Node            Pre-            Post-
                                                                         % Difference
                                       development      development
               2021     UW1686               -              31.5              -

                        NOON122            <0               <0                -

               2036     UW1686               -              30.7              -

                        NOON122            <0               <0                -


2.5 Fire Flow
For the purpose of the model, each node in the development was assigned a 15 L/s fire flow
demand for residential. Using the assigned fire flow demand for the proposed development nodes
and the existing fire flow demands assigned by Unitywater to the existing network a fire flow event
was simulated for each fire node individually. All fire nodes in the model were analysed to
determine their minimum residual pressure during a fire flow event at that hydrant. The worst case
2/3 PH background demand occurred at approximately 4:30pm. As such this was the start time for
the fire flow analysis.

In both the pre-development and post-development scenarios several nodes in the existing
network had residual pressure below 12m during a fire flow event. These nodes have been
included in Appendix B. It is noted that the residual pressure at these nodes was not noticeably
worsened in the post-development cases and therefore the addition of the proposed development
did not have a worsening effect on the network with regards to fire flow.

In all scenarios, except for the failing nodes, all hydrants maintained adequate pressure during a
fire flow analysis. The results for the most critical node (UW1686) in the proposed development
and the most critical node in the DMA (NTHWJ002542) are shown in Table 4 and Appendix B.


                                  Table 4 – Fire Flow Analysis Results

                                                      Residual Pressure (m)
             Year          Node              Pre-            Post-
                                                                           % Difference
                                         development      development
             2021       UW1686                   -           28.00                -

                      NTHWJ002542                <0            <0                 -

             2036       UW1686                   -           27.83                -

                      NTHWJ002542                <0            <0                 -




Covey Associates Pty Ltd                         4                                    Project No: 233467
Consulting Engineers                                                                  M23-0030Rpt Iss A