volume 1 - Halifax Regional Municipality

Halifax Water Integrated Resource Plan
Appendices
An integrated water system network model (Integrated Network Model) was used to:
• Assess current network capacity;
• Identify and size required transmission main projects for future growth; and
• Identify and size required transmission main projects for security of water supply.
The Integrated Network Model incorporates three pre-existing network models which
cover the West, East and Central operating regions of the utility serviced by the J.D.
Kline WSP and the Lake Major WSP.
In recognition of the potential future requirements for meeting limited demands across
HRM under emergency conditions resulting from a prolonged outage at either the J.D.
Kline or Lake Major WSPs, the Integrated Network Model has also been used to study
the transmission main sizes required to deliver limited amounts of water from the J.D.
Kline WSP to the Dartmouth distribution system or from the Lake Major WSP to the
communities of Bedford and Sackville. The results of this analysis has shown that the
existing and proposed water transmission mains incorporated into an integrated
regional water transmission system will have the capacity to meet future average day
demands through most of the urban core when one of the major water supply facilities
is out of service. In fact, the only part of the system that cannot be provided with
average day demand from the Lake Major WSP is the Halifax Peninsula and the west
part of the system serviced from the Geizer Hill Storage Reservoirs (i.e. Spryfield,
Herring Cove, Cowie Hill and BLT) due to the supply limit of the Lake Major WSP. During
a protracted loss of service from the J.D. Kline WSP, these areas of the system would
receive unfiltered, disinfected water from the Chain Lakes backup source.
The transmission main projects are presented in Table 2.12. The Transmission Main
program totals $141.8 million ($2012). It includes 8 projects that are related to growth
(regional level infrastructure) as well as 16 other projects associated with asset renewal
and system security.
Infrastructure necessary to provide local servicing is paid for by the developer at the
time of development. As well, area master infrastructure (oversized infrastructure that
is required to directly support the designated master planning areas both inside and
outside the development boundary and that is not considered Regional), is paid for by
the developer and may be facilitated through the capital cost contribution (CCC)
process. Neither local nor area master infrastructure is shown in the projected growth
costs in the IRP.
Revision: 2012-10-29 Integrated Resource Plan –Appendices F-29
October 31 2012 Page 208 of 272