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

BLUE CARE SUNRISE BEACH
ENGINEERING REPORT FOR DEVELOPMENT APPLICATION


Table 3.7, Boundary Conditions for Water Supply Reticulation Analysis, Corner of Ben
Lexcen Dr and Grasstree Ct

                                Existing             Proposed
                                               (with nominal 550EP)
 HGL                             74.77m              73.66m
 Pressure                        42.73m              41.62m

The WaterGEMS modelling package was used to assess the existing water supply
reticulation, using the adopted boundary conditions. The proposed 530 EP were input to
the model at the proposed connection point, at the western end of Grasstree Ct. The
model showed that the existing DN100 main along Grasstree Ct was not adequately sized,
and, thus, it is considered necessary to augment the existing infrastructure. A DN150
looped main was modelled as shown on Figure 3.8.

Figure 3.8, Proposed Augmentation to Water Supply Reticulation (Proposed DN150
shown in red).




A fireflow demand of 15 L/s was included at the proposed connection point, with the
Maximum Hour flow background demand. The model showed that the minimum pressure
at the proposed connection point would be 36m, which is above the required minimum fire-
flow residual pressure of 12m as defined by the SCRC Planning Scheme.

The water supply reticulation modelling analysis shows that the proposed augmentation
provides an adequate level of service provision to the proposed development and to
existing connections in the vicinity.




Blue Care Property Development Unit                   Version 1.1                      24 June 2008
2008 06 24 2383-01 Engineering Report for DA     Commercial in Confidence                   Page 17