080624 2383-01 FINAL Engineering Report for DA.pdf [As Published] · 132008.1128

BLUE CARE SUNRISE BEACH
ENGINEERING REPORT FOR DEVELOPMENT APPLICATION



3.5 SEWERAGE RETICULATION ASSESSMENT
There is an existing sewage pump station located to the west of the proposed development
site. Excluding the proposed development site, the sewage pump station’s ultimate
catchment includes 630 EP (191 ET) as outlined in Table 3.9.

Table 3.9, Design Peak Wet Weather Flows, External
                                                          EP/dwelling
                                        Dwelling Units       unit                    EP
 Detached Residential                          137             3.3                  452.1
 Attahced Residential                          69              2.6                  179.4
                                                              Total                 631.5
                                                             Adopt                  630

The ultimate sewage loading (including 470 EP from the proposed development) on the
sewage pump station is 1100 EP (333 ET), which produces a design PWWF = 11.6 L/s.
The post-development design velocity through the existing DN100 rising main would be
1.5m/s which is within acceptable limits for scour velocity (0.75-1.8 m/s) as defined by the
SCRC Planning Scheme Policy 6.

The existing sewerage infrastructure is considered adequate to service the ultimate
development population, including the proposed development.

3.6 SUMMARY
Design criteria for water supply and sewerage were determined in accordance with the
Sunshine Coast Regional Council (Noosa) Planning Scheme.

The existing water supply and sewerage infrastructure was assessed to determine the
level of service provided to the area, post-development.

Modelling analyses have shown that it will be necessary to augment the existing water
supply infrastructure with a DN150 main along Grasstree Court (Approx 230m), however,
the existing sewerage infrastructure is considered to provide an adequate level of service
to the ultimate development.

It is recommended that the proposed water supply reticulation augmentation be adopted to
ensure the post-development standards of service for water supply are maintained.




Blue Care Property Development Unit                           Version 1.1                   24 June 2008
2008 06 24 2383-01 Engineering Report for DA             Commercial in Confidence                Page 18