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7C, Final Draft of I&I Report
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7C, Final Draft of I&I Report
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Final Draft of I&I Report
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Agenda Item
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3/31/2008
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<br />FIGURE 8 ESTIMATION OF INFILTRATION I INFLOW <br /> <br />Meter Shed <br /> <br />I M052 <br /> <br />Estimated Residential Equivalent Connections <br />Inch Miles of Sewer pipe (w/o services) <br /> <br />1121 <br />13.6 in-mi <br /> <br />Method 1 - Assume no VI in January <br /> <br />Monthly Flow Data (mgd) <br /> <br /> Annual January peat Mo. <br /> Average <br />2004 0.039 0.030 0.047 June <br />2005 0.039 0.035 0.043 June <br />2006 0.038 0.036 0.043 Sep <br /> <br />III <br />(mgd) <br />0.009 <br />0.004 <br />0.002 <br /> <br />(MG annual) (%) <br />3.29 23.08% <br />1.46 10.26% <br />0.73 5.26% <br />5.48 12.87% <br />1,543 <br />8,448 <br />2,816 <br /> <br />Calculated GPD per connection <br /> <br />2006 rate $ <br />T olal Cost $ <br />Annual $ <br /> <br /> Annual January Peak Mo. <br /> Average I <br />2004 348 268 420 <br />2005 348 313 384 <br />2006 339 321 384 <br /> <br />Method 2 - Assume early morning low flow is entirely inflitration (clear water) <br /> <br />May - September 2007 <br />8/30/2007 Daily Flow <br />Dry Day - Early Morning Flow <br />Net Wastewater <br /> <br />43,000 Igpd <br />24,000 gpd <br />t 9,000 gpd <br /> <br />1,000 jgph <br /> <br />Infiltration rate: <br /> <br />(EMFlin mil <br /> <br />1,765 gpd/in mi <br /> <br />Wastewater per connection: <br /> <br />170 gpd/connection <br /> <br />Peak Flow 9/20/07 <br /> <br />Inflow per connection <br /> <br />4,302 gph 0.103 mgd <br />1,97t gph 0.047 mgd <br />2,331 gph 0.056 mgd <br /> 0.080 <br /> 0.141mgd <br /> 3.26 <br />500 gpdlconnection <br />4,114 gpdlin mi <br /> <br />Peak Hour Rate: 19:00 hrs <br />Dry day flow at time <br />INFLOW <br /> <br />Normal Peak <br />Adjusted Peak <br />Calc. PIA Ratio <br /> <br />Inflow per in mile <br /> <br />M052 <br />
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