volume 1 - Halifax Regional Municipality

Halifax Water Integrated Resource Plan
Appendices
• The storm system asset renewal represents between 2% and 20% of the total
wastewater and stormwater system renewal costs depending on level. Under C
Level no expenditures are required for the storm pipe system. This reflects the
relatively young starting age of the storm pipes based on the year the service area
was developed.
• The modelled renewal rates significantly exceed the current renewal rates for all
assets except storm culverts and sanitary trunk and collector sewers, which are close
to, modelled rates.
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 0.37% $111.4
Sewers 100 0.13%
B 0.25% $74.3
C 0.12% $37.1
A 0.37% $35.6
Trunk 100 0.21%
B 0.25% $23.7
C 0.12% $11.9
A 3.26% $85.5
Forcemains 50 0.74%
B 2.45% $56.1
C 0.83% $18.8
Pumping Stations
Civil - 50
M&E - 20
ICA - 10
2.10%
A 4.42% $128.4
B 3.52% $101.4
C 3.19% $89.5
Treatment Facilities
Civil - 50
M&E - 30
ICA - 10
0.50%
A 3.09% $342.9
B 2.76% $279.4
C 1.33% $148.1
A 0.77% $174.4
Pipes 75 0.06%
B 0.36% $64.6
C 0.00% $0
Revision: 2012-10-29 Integrated Resource Plan –Appendices F-14
October 31 2012 Page 193 of 272