volume 1 - Halifax Regional Municipality
volume 1 - Halifax Regional Municipality volume 1 - Halifax Regional Municipality
Halifax Water Integrated Resource Plan Recommended IRP and Analysis Figure 6.4 Dartmouth WWTF Flow Components The flow components were determined through an analysis of available WWTF flow data and RWWFP modeling results. They do not account for system overflows as these flows will not reach the WWTFs. The wastewater flows making up the total projected flows at the Dartmouth WWTF in 2046 have been differentiated in two ways: • Existing and future flows. • Sanitary and I/I flows. Existing flows were measured at the WWTF reflecting the current contribution from the sewershed tributary to the Dartmouth WWTF. Future flows were projected based on design allowances and estimates of population and unit rates. Sanitary flows are comprised of wastewater flows from residential and employment sources while I/I flows are comprised of groundwater infiltration and wet weather inflow and infiltration. It is vital to distinguish among these various flow components as the extent of demand reduction, the method of demand reduction and the costs of demand reduction are all dependent on which component is under consideration. Revision: 2012-10-29 Integrated Resource Plan 81 October 31 2012 Page 114 of 272
Halifax Water Integrated Resource Plan Recommended IRP and Analysis • Demand reduction for the existing and future sanitary flows occurs through the ongoing decline in water use whereby both residential and employment water demand and hence wastewater generation are reduced. • I/I reduction pertains only to existing I/I flows. Future I/I flows are determined from design allowances that provide part of the margin of safety in wastewater systems design. This is particularly true of long-lived assets such as pipes with a 100-year longevity. • For the purpose of the demand reduction assessment the following assumptions have been made: - Existing sanitary – 10% reduction in existing sanitary flows through water demand reduction. This is a conservative reduction based on retrofit of existing homes and purchase of new water efficient appliances. - Future sanitary – 30% reduction in sanitary flows through future water demand reduction. - Existing I/I – 30% I/I reduction in existing I/I flows. This is consistent with the targets set for King County Washington. 31 - Future I/I – Current design allowance. Figure 6.5 shows the results of a capacity-demand analysis resulting in a somewhat longer timing (2033 versus 2026) for required expansion of the Dartmouth WWTF than currently being considered in the RWWFP. It nonetheless serves to illustrate the case study and the nature of offsetting capital costs. The figure shows that the total projected flow at Dartmouth with the -future flow projected by the RWWFP would require a treatment capacity in excess of 99,860 m 3 /d or when compared to the current capacity of 83,800 m 3 /d an expansion of 16,060 m 3 /d. With the demand reduction strategy applied, flows are reduced by about 16% to slightly below current rated capacity at 2046. This has the effect of deferring the expansion requirement to beyond the planning period of this IRP. 31 Initial Infiltration Inflow Reduction Project Alternatives Analysis Report, King County Washington, April 2009 Revision: 2012-10-29 Integrated Resource Plan 82 October 31 2012 Page 115 of 272
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<strong>Halifax</strong> Water Integrated Resource Plan<br />
Recommended IRP and Analysis<br />
Figure 6.4<br />
Dartmouth WWTF Flow Components<br />
The flow components were determined through an analysis of available WWTF flow<br />
data and RWWFP modeling results. They do not account for system overflows as these<br />
flows will not reach the WWTFs.<br />
The wastewater flows making up the total projected flows at the Dartmouth WWTF in<br />
2046 have been differentiated in two ways:<br />
• Existing and future flows.<br />
• Sanitary and I/I flows.<br />
Existing flows were measured at the WWTF reflecting the current contribution from the<br />
sewershed tributary to the Dartmouth WWTF. Future flows were projected based on<br />
design allowances and estimates of population and unit rates. Sanitary flows are<br />
comprised of wastewater flows from residential and employment sources while I/I flows<br />
are comprised of groundwater infiltration and wet weather inflow and infiltration. It is<br />
vital to distinguish among these various flow components as the extent of demand<br />
reduction, the method of demand reduction and the costs of demand reduction are all<br />
dependent on which component is under consideration.<br />
Revision: 2012-10-29 Integrated Resource Plan 81<br />
October 31 2012 Page 114 of 272
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