volume 1 - Halifax Regional Municipality

Halifax Water Integrated Resource Plan
Integrated Resource Plan Development and Evaluation
Baseline and Enhanced Overflow Control
Comparison of the plans in Bundles 3 and 4 show a difference of $71 million in the 30-
year NPV of costs or about 3.6 % of Plan 15-1 (2.4 % of Plan 25-1). This is associated with
the Enhanced Overflow Control Program. As was previously noted, due to the significant
uncertainty around both the required level of control and the timing of required
implementation this program was allocated to the end of the planning period. Thus, the
NPV of the program capital costs are heavily discounted and no O&M costs have been
added since they would accrue beyond the end of the planning period.
For purposes of further analysis, both the Baseline and the Enhanced Overflow Control
Program were carried forward to the intermediate plan analysis.
Asset Renewal
The Objective 8 asset renewal costs associated with each infrastructure system are
presented in Figure 5.4.
For each level of asset renewal, the wastewater system costs are dominant. For
example, the A level wastewater represents approximately 50% of the total asset
renewal effort. The storm sewer systems are relatively new but still require some ongoing
investment. The water systems require an intermediate level of expenditure (38%
of the total for Level A).
Figure 5.4
Objective 8 Asset Renewal Costs by Asset System ($million)
For purposes of further detailed analysis of asset renewal requirements the asset
renewal variation was brought forward into the intermediate set of IRP plans.
Revision: 2012-10-29 Integrated Resource Plan 65
October 31 2012 Page 98 of 272