volume 1 - Halifax Regional Municipality

Halifax Water Integrated Resource Plan
Appendices
Table 2.3
Wastewater and Stormwater System Asset Renewal Analysis
Asset Group
Design
Asset Life
(Years)
Current Annual
Expenditure as
% of Total
Replacement
Value
Variation
Annual Asset
Renewal Rate
% of
Replacement
Value
Asset Renewal
Model 30 year
NPV (Discount
Rate 3%) ($m)
A 2.50% $7.2
Culverts 50 2.41%
B 2.00% $5.8
C 1.66% $4.8
A $885.4
Wastewater and Stormwater System Totals
B $605.3
C $310.2
The results presented in Table 3.4 show the following:
• At present a modest fraction of the sewers and trunk sewers are above design life.
The M&E and ICA components of the wastewater treatment facilities and pumping
stations, forcemains and the stormwater conveyance assets are all presently within
design service life.
• Modelling results for asset renewal levels A through C all maintain a zero % fraction
above design life for M&E and ICA components of the wastewater treatment
facilities, pumping stations, forcemains and the stormwater conveyance assets at
the end-of-period.
• The asset renewal modelling results for the trunk sewers and collectors show a
decrease in fraction above design life for the A and B levels of asset renewal. The C
level shows a slight increase. The average results increase in all cases with smaller
increases associated with the A and B levels versus the C level.
Revision: 2012-10-29 Integrated Resource Plan –Appendices F-15
October 31 2012 Page 194 of 272