volume 1 - Halifax Regional Municipality

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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
Halifax Water Integrated Resource Plan Integrated Resource Plan Drivers and Objectives Table 4.6 Linear Infrastructure Renewal Rates Asset System Asset Design Life (yrs.) Replacement Costs $million Current Average Annual Expenditure $ million/yr. Current Renewal Rate %/yr. Benchmark Renewal Rate Range28 %/yr. Water Distribution Mains 75 $1,537 $3.5 0.23 0.1 -2.2 Transmission Mains 75 $495 $2.5 0.50 0.1 -2.2 Wastewater Collector Sewers 100 $1,518 $2.0 0.13 0.01 -0.14 Trunk Sewers 100 $483 $1.0 0.21 0.01 -0.14 4.5 INTEGRATED RESOURCE PLAN CHALLENGES, OPPORTUNITIES AND RISKS Based on the review of IRP drivers, the following summarizes IRP challenges and opportunities. 4.5.1 Compliance Challenges, Opportunities and Risks Water The water system is currently fully in compliance with drinking water standards and related Halifax Water LOS. The on-going implementation of the WQMP will ensure continued compliance with anticipated future drinking water standards. From the perspective of the IRP, this program is well established with the WQMP already in its second version. The uncertainty surrounding future water regulation is therefore relatively small. Hence the risk to Halifax Water from unforeseen future requirements is also small. Wastewater A number of the wastewater treatment facilities are currently not in compliance with permitted effluent requirements or with related Halifax Water LOS. The WSER will require upgrade of the three HHSP facilities to secondary treatment. This will occur within a 20-year timeframe. Halifax Water also owns and operates nine WWTFs (plus BLT which is already being upgraded) that discharge into limited capacity or sensitive receiving waters. It is expected that within the 30-year lifetime of the IRP that advanced nutrient control (N and P) will be required for these facilities. These future requirements are reasonably certain with only the extent and timing of the nutrient upgrades not fully specified. Regulation of sanitary and combined sewer system overflows is at present limited to monitoring and reporting requirements as well as requirements for controlling gross debris through screening at selected outfalls. Future requirements for overflow management are 28 International Comparison of Water and Sewerage Service 2007 Report, OFWAT, April 2007 Revision: 2012-10-29 Integrated Resource Plan 44 October 31 2012 Page 77 of 272
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Financial Model 40-4 Halifax Water
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Financial Model 40-4 1.028 Cavalier
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Asset Renewal Costs Halifax Water I
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Statement Concerning Halifax Water
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Statement Concerning Halifax Water
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volume 1 - Halifax Regional Municipality

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