volume 1 - Halifax Regional Municipality
volume 1 - Halifax Regional Municipality volume 1 - Halifax Regional Municipality
Halifax Water Integrated Resource Plan Recommended IRP and Analysis TOTAL $2,579 million 30-Year NPV Figure 6.2 Recommended IRP Expenditures by Driver (30-year NPV $ million) 6.3 RECOMMENDED IRP ANALYSIS The Recommended IRP was analysed to assess the impact of three factors: • The potential benefits of water demand reduction and I/I reduction on the Recommended IRP. • The level of asset renewal (A, B, C and composite) on end-of-period asset value. • The population growth rate (high, baseline and low) on plan requirements. 6.3.1 Demand Reduction One of the key requirements of the IRP Terms of Reference was the examination of demand reduction strategies for both the water and wastewater systems. The purpose was to explore the opportunities to incorporate such strategies as the focus of one or more of the resource plans. Unfortunately, systematic data that would allow a comprehensive examination of I/I reduction in particular were not available. Consequently, a high-level analysis of opportunities was carried out with a view to informing future integrated resource plan evaluation of the potential for incorporating demand reduction strategies. The focus of the analysis was the Dartmouth WWTF, which the RWWFP identified as requiring expansion due to growth. I/I Programs The IRP Recommended IRP contains significant investment in infrastructure projects with an I/I reduction focus. Some of these projects are carried forward from the Five- Year Capital Plan. These I/I related projects – including the projects specified in the RWWFP – represent approximately $95 million in capital expenditure. As well, there is $130 million based on the composite level of the renewal program in wastewater Revision: 2012-10-29 Integrated Resource Plan 79 October 31 2012 Page 112 of 272
Halifax Water Integrated Resource Plan Recommended IRP and Analysis system asset renewal projects. These projects will replace aging sewer infrastructure and will accordingly have an I/I reduction benefit. Finally, the Recommended IRP includes $1.7 million for funding of the I/I pilot program. This is an initial investment and it is anticipated that it will be necessary to plan for a higher level of on‐going funding particularly as the program is implemented. As previously noted, the I/I pilot and Wet Weather System Plan programs are described in Volume 1 Appendix F Water Use While population in the HRM has been increasing, water demand has declined a net amount (accounting for population growth) of approximately 1.5% per year over the last ten years. The decline in water demand is due to reduced residential and employment consumption. Figure 6.3 depicts the decline in urban core metered water consumption showing the change in the period from 2001 to 2012. Figure 6.3 Urban Core Metered Water Consumption History 6.3.2 Demand Reduction Case Study A full business case analysis of demand reduction was not feasible for this IRP due to limitations in available data. A case study approach was taken that examined the benefit gained from water and wastewater demand reduction at the Dartmouth WWTF. The Dartmouth WWTF was chosen since it will require expansion due to growth in the 2021‐ 2026 timeframe as identified in the RWWFP. The first step in the analysis was to estimate the flow components that comprise wastewater flow under both existing (2011) and future (2046) conditions. The 2046 flows were developed as the basis of analysis in the RWWFP and were used for this analysis. Figure 6.4 presents a schematic of the flow components for the Dartmouth WWTF. Revision: 2012‐10‐30 Integrated Resource Plan 80 October 31 2012 Page 113 of 272
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<strong>Halifax</strong> Water Integrated Resource Plan<br />
Recommended IRP and Analysis<br />
TOTAL $2,579 million<br />
30-Year NPV<br />
Figure 6.2<br />
Recommended IRP Expenditures by Driver (30-year NPV $ million)<br />
6.3 RECOMMENDED IRP ANALYSIS<br />
The Recommended IRP was analysed to assess the impact of three factors:<br />
• The potential benefits of water demand reduction and I/I reduction on the<br />
Recommended IRP.<br />
• The level of asset renewal (A, B, C and composite) on end-of-period asset value.<br />
• The population growth rate (high, baseline and low) on plan requirements.<br />
6.3.1 Demand Reduction<br />
One of the key requirements of the IRP Terms of Reference was the examination of<br />
demand reduction strategies for both the water and wastewater systems. The purpose<br />
was to explore the opportunities to incorporate such strategies as the focus of one or<br />
more of the resource plans. Unfortunately, systematic data that would allow a<br />
comprehensive examination of I/I reduction in particular were not available.<br />
Consequently, a high-level analysis of opportunities was carried out with a view to<br />
informing future integrated resource plan evaluation of the potential for incorporating<br />
demand reduction strategies. The focus of the analysis was the Dartmouth WWTF,<br />
which the RWWFP identified as requiring expansion due to growth.<br />
I/I Programs<br />
The IRP Recommended IRP contains significant investment in infrastructure projects<br />
with an I/I reduction focus. Some of these projects are carried forward from the Five-<br />
Year Capital Plan. These I/I related projects – including the projects specified in the<br />
RWWFP – represent approximately $95 million in capital expenditure. As well, there is<br />
$130 million based on the composite level of the renewal program in wastewater<br />
Revision: 2012-10-29 Integrated Resource Plan 79<br />
October 31 2012 Page 112 of 272
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