volume 1 - Halifax Regional Municipality

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Halifax Water Integrated Resource Plan IRP Planning Context and Levels of Service • Springfield Lake is proposed to be diverted to the Mill Cove WWTF via a new pumping station, force main and gravity sewer to the existing Bedford Sackville trunk sewer (BSTS). A large storage tank is proposed in the upper section of the BSTS, with a further storage tank in the lower section of the trunk sewer. • The west section of the current Mill Cove sewershed is proposed to be diverted south, ultimately discharging to the Herring Cove WWTF. • Total flow arriving at Mill Cove WWTF is expected to stay approximately at current levels. Aerotech requires upgraded conveyance and treatment. • Additionally, the WWTF effluent discharge outfall is proposed to be relocated to a less sensitive waterbody. West Region • Includes: Halifax, Beechville-Lakeside-Timberlea (BLT) and Herring Cove • In total, planned serviced growth is 85,400 persons of residential growth plus related employment growth. • The strategy for the West Region is focused on diverting a portion of flows from west of Mill Cove to the Halifax WWTF and a large flow diversion to the Herring Cove WWTF, which has a large proposed expansion driven by the recommendations of the RWWFP. • The entire BLT sewershed flows are proposed to be diverted towards the Halifax peninsula and potentially connected to the Herring Cove diversion. • Management of the BLT flows require an interim expansion/upgrade of the WWTF to address on-going compliance issues that are already identified in Halifax Water’s Five-Year Capital Plan. • Flows from the north and BLT are proposed to be directed to an upgraded Armdale pumping station, which together with the existing pumped flows (lower Spryfield/Armdale area) are routed through a new force main to the Herring Cove system where a new proposed gravity sewer will take flows to the Herring Cove pumping station which, following upgrade will deliver flows to the expanded Herring Cove WWTF. East Region • Includes: Belmont, Dartmouth, Eastern Passage and North Preston • In total, planned growth is 56,100 persons of residential growth and related employment growth. • In Dartmouth, new storm sewers from little Albro Lake to the vicinity of Jameson PS and from Fenwick St to the vicinity of Old Ferry Rd PS will help separate and convey Revision: 2012-10-29 Integrated Resource Plan 23 October 31 2012 Page 56 of 272
Halifax Water Integrated Resource Plan IRP Planning Context and Levels of Service stormwater flows to the Halifax Harbour. This will help to alleviate some capacity constraints within the existing collection system. • Existing sewers will be twinned along Albro Lake / Slayter Street to Old Ferry Road PS to help divert flows away from the already constrained harbour-side sewers and CSO facilities. New storage facilities will be provided at Shannon Park and Anderson Lake to service those growth areas. • The Old Ferry Rd PS and forcemain will need to be upgraded to accommodate additional flows from projected growth, conveyed to the pumping station by the new Albro Lake / Slayter Street sewer. • The Dartmouth WWTF will need to be upgraded to accommodate future growth flows within the Dartmouth service area. • In Eastern Passage, localized sewerage upsizing will mitigate local system constraints. A combination of increased storage at Bissett Lake Pumping Station and a new pressure sewer line will accommodate growth flows, conveying them to Eastern Passage WWTF, which is currently being upgraded and expanded. The total capital cost of the RWWFP is estimated as $645 million ($2012). The RWWFP expenditures were directly incorporated into the IRP using the timing as indicated in the RWWFP. A summary of RWWFP expenditures is presented in Volume 1 Appendix E. The RWWFP has presented a plan addressing growth driven wastewater servicing and the mitigation of growth related overflows. The RWWFP represents an important step forward in preparing a holistic strategy for wastewater management in Greater Halifax. Nonetheless, there are additional wastewater planning dimensions that will need to be merged with the RWWFP in future. They include: • The incorporation of wet weather flow reduction measures (principally a realistic made-in-Halifax I/I reduction program). This planning element should examine the economic trade-offs between expanded capital facilities and flow reduction measures. • The incorporation of water demand reduction in the planning of water and wastewater facilities. This planning element should be merged with the I/I reduction program and should examine the economic trade-offs between expanded capital facilities and combined flow reduction measures. • The expansion of the RWWFP overflow control program to include outfalls not directly impacted by planned growth and to develop an overflow control strategy prioritized by receiving water body. • The implementation of additional storm drainage facilities in presently underserviced areas. This program ties into the wet weather flow reduction program as well as it provides an engineered outlet for on-lot footing drain and roof Revision: 2012-10-29 Integrated Resource Plan 24 October 31 2012 Page 57 of 272
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Capital Expenditure Program All $ i
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Recommended Alternative Resource Pl
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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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Summary of Capital, Operational and
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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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