volume 1 - Halifax Regional Municipality

Halifax Water Integrated Resource Plan
Integrated Resource Plan Drivers and Objectives
Table 4.5
System
Pipes, Culverts, and
Ditches
Water, Wastewater, and Stormwater System Asset Data Gaps
Stormwater
Data Gap
• 190km (24%) of stormwater pipes are not in GIS.
• Limited data in GIS for stormwater culverts (only 8km recorded).
• No asset data on stormwater ditches.
• 31% of stormwater pipes and 21% of stormwater culverts lack data on diameter/sizing.
• There is no condition data on the stormwater collection network.
• There are no service levels or performance indicators for the stormwater collection network.
• No historical renewal/rehabilitation activity recorded for the stormwater collection network.
Based on the review, it was clear that there were significant limitations on asset
condition data with water system linear assets having the most recorded information
and wastewater and stormwater linear assets having little or no recorded condition
data. The status of condition data for point assets such as treatment plants and pump
stations were somewhat more difficult to assess. From the standpoint of a central asset
management system, data pertaining to these assets was sparse. Nonetheless, it is
believed that the operations staff has good knowledge of their facilities and is able to
provide on-going identification of renewal, repair and replacement projects.
The review also indicated limitations in knowledge about the current asset inventory
particularly for the wastewater and stormwater systems. Certainly, only a fraction of asset
inventory currently resides in an easily accessible form in the Halifax Water GIS system.
These data limitations shaped the asset renewal methodology that was ultimately
employed in the IRP and represents a planning risk in the estimation of the renewal
costs. The details of the asset renewal estimation methodology are presented in Volume
3 Appendix E.
4.4.3 Current Asset Renewal Expenditure
The current level of asset renewal expenditure based on the Five-Year Capital Plan is
about $22.4 million/yr. Table 4.6 presents the details of the current renewal rates for
the major linear systems. The Halifax Water replacement rates range from about 0.23%
to 0.5% for water mains and 0.13% to 0.21% for sewers. These rates actually compare
favourably with UK benchmark rates shown in the last column of Table 4.6; this however
does not indicate an adequate level of renewal activity in Halifax.
Revision: 2012-10-29 Integrated Resource Plan 43
October 31 2012 Page 76 of 272