volume 1 - Halifax Regional Municipality

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Halifax Water Integrated Resource Plan Appendices 2.2.2 I/I Reduction Pilot Program An important part of Halifax Water’s long-term approach to reducing wastewater system demand is a comprehensive I/I program. The first step in that program is developing Halifax based information regarding the sources of I/I, possible measures to reduce I/I and the effectiveness and costs of these measures. This is the primary purpose of the I/I pilot program. Table 2.11 outlines the proposed program tasks and estimated duration. These tasks are intended to proceed in parallel to the extent possible. Table 2.11 I/I Pilot Program Outline Baseline/Existing Study Review Task Description/Activities • Review recommendations from previous I/I related studies • Review existing CCTV inspection reports • Confirmation of recommendations that are still valid and required for implementation • Review existing flow monitoring and rain gauging locations (overall network) • Identify additional monitoring locations • Review hydraulic model and confirm pilot area is covered by skeletonized collection system model • Identification of data gaps Sewershed Prioritization/Data Collection and Model Development • Prioritization of prospective pilot program sewersheds (consideration of both public and private side flow reduction opportunities; focus on sewersheds expected to see WWTF expansions or significant PS upgrade requirements) • Select pilot program sewersheds • Build out model to serve pilot area(s) as needed • Identify flow monitoring location(s) for the pilot sewersheds and outline the flow monitoring program is to be undertaken • Assess need and feasibility of remote data access (using PI system) and impacts on timing for the pilot • Identify data coordination requirements with the hydraulic model • Install and calibrate flow meter(s) • Identify and assess range of I/I reduction techniques suitable for implementation in each pilot sewershed (storage, operational repairs (manhole, main line spot repairs), manhole cover plugs, sewer separation (combined systems), deep storm installation program (sanitary systems – no existing storm system), collection system relining program, lateral relining program, pressure grouting of manholes, flood grouting, sump pump disconnection program, foundation drain and roof leader disconnection program) • Identify capital projects that may be incorporated into the pilot evaluation process (i.e. pre-/post-construction monitoring of relevant capital projects) • Identify work plan, schedule, and measurement requirements for each sewershed Component Duration 3 months 36 -60 months Revision: 2012-10-29 Integrated Resource Plan –Appendices F-27 October 31 2012 Page 206 of 272
Halifax Water Integrated Resource Plan Appendices Table 2.11 I/I Pilot Program Outline Implement I/I Solutions Task Description/Activities • Begin baseline monitoring • Implement simple operations solutions first (plug manhole covers, replace covers with lock-tight covers, minor spot repairs, etc.) • Implement specific solutions from previous studies • Implement private side solutions • Measure changes in flow after each solution is implemented • Track implementation costs Evaluate Effectiveness of Pilot • Identify all variables for each pilot area (slopes, soils, existing conditions, known illegal connections, etc.) • Identify criteria to be used to evaluate effectiveness of the potential solutions • Incrementally implement and measure the impact of the agreed I/I techniques for each pilot sewershed • Assess how each successful I/I solution may be relevant to other sewersheds in the service area • Using the hydraulic model, plug in observed I/I reductions for the relevant sewersheds and predict the savings system-wide • Evaluate the impact of each solution in terms of m 3 /reduced and cost to achieve the reduction Reporting • Report on findings/results of the pilot program with regular updates • Use performance data to support future implementations of specific I/I techniques in other sewersheds (dollars spent, reduction in flows realized, recommendations for future implementations) Component Duration 24 months 18 to 24 months 12 months The success of the pilot program will require appropriate operational and capital funding for the pilot including the necessary flow monitoring, calibration and data management needs. As well, dedicated resources should be provided for this effort including the public side program, the private side program and operational resources for implementing operations-related repair work. A total of $1.7 million has been budgeted for I/I pilot program development. Additional funding will be needed for solutions implementation. 2.3 TRANSMISSION MAIN CAPACITY AND SECURITY Halifax Water is currently developing a long-term plan to expand and upgrade the trunk water transmission main system across the urban core to meet the demands of a growing population, to enhance overall system security, and to strengthen the capacity of the system to provide water under emergency conditions between the J.D. Kline system and the Lake Major system. Revision: 2012-10-29 Integrated Resource Plan –Appendices F-28 October 31 2012 Page 207 of 272
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volume 1 - Halifax Regional Municipality

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