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PF =Peaking Factor =Ratio of Max Month to Annual Average <br />Similarly, the red line in Figure 12 represents maximum-month flows at the <br />wastewater treatment plant projected with a maximum month peaking factor of 1,4, as <br />proposed in the 2001 Master Plmt. The green line represents projections at a lower <br />peaking factor of 1.2, which appears to be more typical of actual maximum flows in <br />recent years, perhaps reflecting the results of OWASA's long-term program to reduce <br />stonnwater infiltration and inflow, As with the water treatment plant, these peak flow <br />reductions could allow substantial deferrals of the next major wastewater plant <br />expansion. <br />• Despite significant reductions in overall consumption when compared to pre-drought <br />levels, the relative water demands by major customer classes (Single Family <br />Residential, Multi-Family Residential, UNC, and Commercial/Other) have remained <br />virtually unchanged from those reported in the 2001 Master Plan (Fig. 13). <br />Fig. 13. Percent of Total Use By Major Customer Group <br /> Calendar Years 1999-2004 <br />m <br />N <br />~ 100% t <br />~ <br /> <br />~ <br /> <br />DD% <br />18/p <br />° <br />~ <br />- 18/0 <br />° ~ <br />'!B°1° <br />..1~,. <br />8% <br /> <br />AB%' <br />~ ~~ <br /> <br />^18% . Comi7VOtha/ <br /> <br />~ 70% .- _- _ _ _. <br />~ ,60% - - _ __ _ <br />Q 50% ^._" _ ~r <br />I"' 40% 25°fo 24°k 2d% 23% 24% 24% <br />`o ._>, "'f = MutiiFalnily~= <br /> _ _ ~~ <br /> <br />~ 31% 38% i 31/ 31% 31% 31°/ <br />a 10% -- ~ --~ ~~_f -- -- -~ ~ _-~ Single Family <br /> <br /> 0% <br /> 1999 2000 2001 2002 2003 2004 <br />Summary <br />A combination of factors and trends support the conclusion that OWASA cats meet the <br />utility needs of increased development density within the currently defined urban services <br />area of Carrboro and Chapel Hilh <br />The ultimate capacity of OWASA's water supply and wastewater treatment facilities are <br />based on projections of future water and wastewater treatment demands that correspond <br />to housing and employment levels that exceed Carrboro's and Chapel Hill's buildout <br />projections by more than 20 percent. This provides a conservative margin of safety for <br />meeting the capacity needs of future development. Recently declining bends in water <br />consumption, as well as the shift toward smaller residential lot sizes and more <br />OWASA -Water and Sewer Capnci[7~ Litplications of /ncreased Development Density <br />Page 17oJ?I <br />