Attachment C - Engineering Technical Note · 132008.1128.02

WATER & WASTEWATER NETWORK INVESTIGATION | BLUE CARE




3          Water Servicing Strategy
A water network assessment was undertaken to assess the infrastructure required to service the site under interim and ultimate
development conditions. The following water service strategy is conceptual only and remains subject to detailed engineering
design.


3.1    Flow Projections
The water demand projections calculated for the development have been determined in accordance with the SEQ Code are
detailed in Table 3-1.


Table 3-1: Projected Water Demands

      Land Use               EP        Average Day (L/s)           MDMM (L/s)             Peak Day (L/s)            Peak Hour (L/s)
 Attached Dwellings          242               0.73                     1.05                    1.37                     2.66
 Aged Care Facility          257               0.77                     1.12                    1.46                     2.01
 Community Facility          103               0.31                     0.45                    0.58                     1.13
         Total               602               1.81                     3.28                    3.41                     5.79
Note: 1) Residential peaking factors adopted for Attached Dwellings and Aged Care Facility as per Unitywater DSS;
      2) Commercial peaking factors adopted for Community Facility as per Unitywater DSS.

A design PH demand of 5.79 L/s is projected the site and will require a minimum Fire Flow (FF) capacity of 15 L/s for residential
land use and 30L/s for the community facility.


3.2    Methodology
The Service Advice Notice (SAN) issued by Unitywater (Refer Appendix B) advised a water network analysis was required for
the site. Water network modelling was undertaken with InfoWater Suite 12.3, and utilised the updated the Noosa Shire Water
Model provided by Unitywater, 02 October 2018.

Assessment of the water network infrastructure was undertaken during Peak Hour and Fire Flow conditions for the 2016 and
2036 planning horizons. The projected demands (Table 2-1) have been applied to the network model with infrastructure
assessed against Unitywater DSS outlined within the SEQ Code. It is recommended that during detailed design, the proposed
internal services be reviewed and certified by a hydraulic engineer in accordance with the relevant codes and guidelines.


3.3    Existing Water Network Infrastructure
The existing water supply infrastructure within the vicinity of the proposed development is outlined within the Unitywater existing
infrastructure maps included in Appendix C. Existing infrastructure includes a DN100 water main located within Grasstree
Court, which currently services the existing Church facility and connects to an existing DN200 trunk main in Ben Lexcen Drive.


3.4    Proposed Water Service Strategy
It is proposed that the two development sites will be serviced by an internal DN100 network. An additional DN150 main will be
constructed external to the development within Grasstree Court to provide additional network capacity through connection to
existing DN100 and DN200 water mains. The proposed water servicing strategy is illustrated on Drawing No. 18-001942-SK201
within Appendix D.




18-001942-WER01                                                                                                                       Page 4