volume 1 - Halifax Regional Municipality

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Halifax Water Integrated Resource Plan IRP Planning Context and Levels of Service leader flows. This program relies on reaching a cost sharing solution with HRM and the benefitting ratepayers. • The update and expansion of the wastewater system model as well as additional sewer system data collection with incorporation into GIS that will provide improved decision support tools to update the evaluation of alternatives in the RWWFP. • The revised planning projections that are being developed in the Regional Plan. • Updated wastewater system design standards and allowances including a realistic incorporation of future climate change impacts. It is for these reasons that the IRP recommendations address a revamped approach to system master planning. This would involve key component activities such as an I/I pilot program upon which the business case for wet weather flow reduction program could be developed. The wet weather flow reduction program would then form one of the key components of a Wet Weather System Plan integrating all the aspects of wet weather flow and overflow management along with climate change. These in turn would be brought together with other collection system needs such as asset renewal and the WWTF expansion/compliance requirements into a Wastewater System Master Plan. The water system would adopt a similar approach with key components such as the WQMP and transmission main program integrated into a Water System Master Plan. The proposed planning approach is presented in Section 7 under the IRP Implementation Plan. Collection System As noted in the introduction to the wastewater system, the present collection systems include areas of combined and separated sewers as well as separated areas that are strongly influenced by wet weather due to historical household connection practices. The topography and geography of the HRM has necessitated extensive use of pumping resulting in 172 wastewater pumping stations. Many of these stations as well as the WWTFs are subject to substantial wet weather influence with wide swings in flow rates resulting from rainfall or snowmelt. This has resulted in numerous designed and some unintentional locations that allow excess wastewater to overflow during wet weather. Based on data collected by Halifax Water there are presently a total of 216 known potential overflow locations within the wastewater system approximately 105 of which are known to have been active at any time. Twenty-nine (29) of the 105 active overflows locations are associated with the combined sewer system. The RWWFP modelled a total of 96 of the potential overflow locations and determined based on the modeled results, 59 overflows are active during a year with average rainfall. The RWWFP modeling further determined that 28 of the 59 overflows active during an average rainfall year would be impacted by future growth. The RWWFP includes measures to control only those 28 overflow locations that are expected to Revision: 2012-10-29 Integrated Resource Plan 25 October 31 2012 Page 58 of 272
Halifax Water Integrated Resource Plan IRP Planning Context and Levels of Service experience growth in their tributary sewersheds and only to a level sufficient to offset the effects of growth. Halifax Water has produced an evaluation of the environmental and public health risks associated with known overflow locations. It has categorized each location according to the categories presented in Table 3.5. Table 3.5 Risk Category A B C D E Receiving Water Risk Categories Risk Description Drinking water Supervised HRM beach or on-ground with high potential for human contact Known unsupervised swimming areas and designated recreational areas (boat clubs, parks etc.) Other freshwater bodies and/or ground with low potential for human contact Other marine bodies The average year overflow volumes associated with current conditions, future growth with no controls, and future growth under the RWWFP preferred scenario are summarized for the 28 overflows impacted by growth in Table 3.6. The Table also includes the 31 non-growth impacted overflow volumes for the same scenarios. Table 3.6 Average Year Overflow Volumes Category Receiving Water Risk Level Number of Outfalls Baseline1 (1000 m 3 /yr.) Growth No Controls1 (1000 m 3 /yr.) Preferred RWWFP1 (1000 m 3 /yr.) Non-Growth Outfalls (31) RWWFP Growth Impacted Outfalls (28) E 12 789 802 947 D 0 0 0 0 C 6 74 74 74 B 13 697 696 667 A 0 0 0 0 Total 31 1,560 1,572 1,688 E 15 6,772 10,935 5,449 D 4 46 355 43 C 5 935 4,895 646 B 4 29 51 28 A 0 0 0 0 Total 28 7,782 16,236 6,166 Total System Outfalls 59 9,342 17,808 7,854 Notes: 1. The differences in the non-growth overflow volumes are due to the impact of the system diversions proposed by the RWWFP along with other minor modeling variations. Revision: 2012-10-29 Integrated Resource Plan 26 October 31 2012 Page 59 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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Financial Model 40-4 2.848 Storage
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Asset Renewal Costs Halifax Water I
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Asset Renewal Costs Stormwater Asse
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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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