volume 1 - Halifax Regional Municipality

Halifax Water Integrated Resource Plan
Integrated Resource Plan Drivers and Objectives
• As noted in Section 3, the RWWFP recommended a plan that provides a regional
wastewater strategy with upgrades required at a number of WWTFs as well as
linking conveyance systems. WWTF expansion will be required as follows:
- Dartmouth – A 16.06 ML/d capacity expansion (2021 - 2026 horizon).
- Herring Cove – A 53.55 ML/d capacity expansion (2031 - 2036 horizon).
- Aerotech – A further 4.65 ML/d capacity expansion (2031 - 2036 horizon), in
addition to the 3.00 ML/d capacity expansion project already underway.
• In addition, there are a number of growth-related water and wastewater projects
expanding transmission mains and major sewers as well as water and wastewater
pumping facilities.
The details of growth impacts on both water and wastewater systems are provided in
Volume 3 Appendices A and B respectively.
Growth Impact on Wastewater Overflows
Future requirements for overflow management are uncertain at present and represent
a significant risk for Halifax Water. Special attention was therefore given to the impact
of growth on overflows. Based on preliminary discussions with regulators, the minimum
future requirement appears to be “no net increase in overflows with growth”. The
RWWFP has addressed this requirement through a strategy of wastewater
regionalization combined with application of new storage, conveyance and pumping
facilities. The RWWFP presents a future path to meet this baseline overflow control
goal. It is expected that 28 of 59 overflow locations identified in the RWWFP will have
growth impacts by 2046. The impact of growth on overflows was presented in Table 3.6.
As noted in Section 3, additional controls may be necessary to meet yet undefined
future overflow control requirements. As part of the IRP, a risk-based Enhanced
Overflow Control Program was developed based on receiving water characteristics. This
program would be additional to the measures in the RWWFP.
4.2.2 Stormwater System
New separated stormwater systems would be developed at the same time as the new
growth areas. The impact on existing stormwater infrastructure would likely be small.
However, with growth, the length of the stormwater network (both piped and ditches)
will be expanded and therefore impact the on-going asset management and operational
programs over time. Sewer separation is an option for asset renewal projects, leading to
increased stormwater infrastructure over time.
Revision: 2012-10-29 Integrated Resource Plan 32
October 31 2012 Page 65 of 272