Attachment C - Engineering Technical Note · 132008.1128.02

WATER & WASTEWATER NETWORK INVESTIGATION | BLUE CARE




5 Conclusions
Water & wastewater network analysis has been undertaken in support of the Blue Care development which consists of 122
attached residential dwellings, 96 bed aged care facility and a central community facility.

Water network modelling was undertaken using InfoWater for the 2016 and 2036 planning horizons. It is proposed that the
development will be serviced via an internal DN100 water main network connected to a proposed DN150 main which will create
a loop with the existing DN100 within Grasstree Court and the DN200 trunk water main in Ben Lexcen Drive. The proposed
internal reticulation network is illustrated on Drawing No. 18-001942-SK201 within Appendix D.

Water network analysis has confirmed that there is sufficient capacity within the existing network to support the proposed
development under the interim and ultimate development horizons without negatively impacting existing network customers.

Development area’s 1 and 2 are proposed to be serviced via internal DN150 gravity networks, which will discharge into the
existing DN225 gravity main located within Grasstree Court. Wastewater network modelling was not conducted with this
assessment as per Unitywater advice indicating that the existing network has adequate capacity to service the proposed
development. The proposed internal wastewater network is illustrated on Drawing No. 18-001942-SK202 within Appendix D.

Strategies investigated and infrastructure proposed as part of this report are conceptual only and require refinement through
detailed engineering design. It is recommended that the proposed service strategies be incorporated into the future Operational
Works detailed design with all proposed internal services to be designed and certified by a hydraulic engineer in accordance
with the relevant codes and guidelines.



6 Recommendations
Calibre recommends the following in support of the proposed Blue Care Minor amendment application:

•   Unitywater review the proposed network strategy and approve the Minor Amendment Application to the existing
    development approval;

•   Unitywater review the fire flow requirement of 30 L/s and amend condition 72 of 132008.1128 which limits firefighting flows
    to 15 L/s;

•   Blue Care adopt the proposed water supply service strategy illustrated in Drawing No’s. 18-001942-SK201;

•   Blue Care adopt the proposed wastewater service strategy illustrated in Drawing No’s 18-001942-SK202;

•   Blue Care engage engineers to undertake detailed design of the network infrastructure required to service the site; and

•   Blue Care engage a hydraulic engineer to certify internal infrastructure and building services in accordance with the
    relevant codes and guidelines.




18-001942-WER01                                                                                                             Page 7