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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 10 ESTIMATION OF INFILTRATION I INFLOW <br /> <br />Meter Shed <br /> <br />IM054 <br /> <br />Estimated Residential Equivalent Connections <br />Inch Miles of Sewer pipe (w/o services) <br /> <br />10791 <br />122.9 in-mi <br /> <br />Method 1 - Assume no III in January <br /> <br />Monthly Flow Data (mgd) <br /> <br /> Annual January Peak Mo. <br /> Average I <br />2004 0.198 0.175 0.264 June <br />2005 0.197 0.172 0.278 Oct <br />2006 0.183 0.184 0.264 May <br /> <br />III <br />(mgd) <br />0.023 <br />0.025 <br /> <br />(MG annual) (%) <br />8.40 11.62% <br />9.13 12.69% <br />0.00% <br />8.10% <br /> <br />17_52 <br />1,543 <br />27,033 <br />9,011 <br /> <br />Calculated GPD per connection <br /> <br />2006 rate $ <br />Total Cost $ <br />Annual $ <br /> <br /> Annual January Pear Mo. <br /> Average <br />2004 184 162 245 <br />2005 183 159 258 <br />2006 170 171 245 <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 I <br />Net Wastewater <br /> <br />181,0001gpd <br />76,800 gpd <br />104,200 gpd <br /> <br />3,200 19ph <br /> <br />Infiltration rate: <br /> <br />(EMFlin mil <br /> <br />625 gpd/in mi <br /> <br />Wastewater per connection: <br /> <br />97 gpd/connection <br /> <br />Peak Flow 9/20/01 <br /> <br />Inflow per connection <br /> <br />23,767 gph 0.570 mgd <br />7,869 gph 0.189 mgd <br />15,898 gph 0.382 mgd <br /> 0.270 <br /> 0.65 lmgd <br /> 3.59 <br />354 gpd/connection <br />3,105 gpdlin mi <br /> <br />Peak Hour Rate: 20:00 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 />M054 <br /> <br />
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