Appendix G Water and Sewer Analysis

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

3.4.1   Pump Station Capacity

An assessment was conducted on the existing capacity of the SPS-CRY020 which is the pump
station located immediately downstream of the development connection point.

The modelled SPS Capacity and the modelled PWWF is based on the results demonstrated in the
InfoSWMM model with the inclusion of development loading. The results of the analysis are shown
in Table 7. As shown the capacity of the pump station is greater than the expected 2036 PWWF
demonstrating that the pump station has the capacity to cater for the increase in loading from the
development.

                     Table 7 – Post Development Pump Station Performance
                                                  Modelled PWWF (L/s)    Ratio of SPS
                                 Modelled SPS                            Capacity to
               SPS I.D              Capacity        Planned Horizon      2036 PWWF
                                      (L/s)
                                                   2021         2036

               CRY020                   18              14            16                 1.1



3.4.2   Rising Main Velocity

The rising main velocity for all pump stations under 2036 post-development loading was analysed.
The analysis showed that the velocity of all rising mains downstream of the pumpstations was
lower than the recommended maximum velocity of 3.0 m/s. Therefore, the rising main velocities
are acceptable.


3.4.3   Operational Storage

The required operational storage was determined for the pump station based on the pump duty for
2036 post-development flows as shown in Table 8. The analysis showed that the wet well has
adequate operational storage capacity to cater for the increased loading from the development.
Appendix C demonstrates the wet well depth over the modelling time period.

                               Table 8 – Wet Well Operational Storage
                                                                                                Ratio of
                            Effective                                       Required
                                          Calculated                                             storage
            Operational       Well                      Total Pump          minimum
  SPS I.D                                  available                                           capacity to
             Depth (m)      diameter                     Duty (L/s)         operating
                                         volume (m3)                                            required
                               (m)                                         volume (m3)
                                                                                                storage
 CRY020         0.43            2                1.4         18                1.4                 1.0



3.4.4   Emergency Storage

The required and available emergency storage was calculated for the pump station catchment
based on the 2036 post-development loading. The existing pump station CRY020 catchment has
1200 EP as detailed in the model provided by Unitywater. As shown in Table 9, the emergency
storage for the pump station was adequate to cater for both existing and development loading.




Covey Associates Pty Ltd                     7                                       Project No: 233467
Consulting Engineers                                                                 M23-0030Rpt Iss A