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Effectiveness of Wastewater Collection System Rehabilitation to Reduce Infilration and Inflow Feb 2004
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Effectiveness of Wastewater Collection System Rehabilitation to Reduce Infilration and Inflow Feb 2004
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Last modified
6/5/2009 11:15:22 AM
Creation date
6/1/2009 12:27:28 PM
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PW_Exec
PW_Division_Exec
Engineering
PWA_Project_Area
Wastewater
PW_Subject
Wastewater
Document_Date
2/29/2004
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300 <br />250 <br />200 <br />1 <br />1so <br />i <br />'100 <br />50 <br />0 <br />0 <br />0.2 <br />0.4 <br />0.6 ~ <br />• <br />e <br />0.8 ~ <br />a <br />.+ <br />C <br />1 <br />1.2 <br />~~'~-.. ~ Nov-95 Dec-95 Jan-98 Feb-98 <br />- Date <br />`-- Figure 1 - E/S WPCF pre-rehabilitation measured flow and rainfall <br />1 <br />m <br />0 <br />i <br />9 <br />t_ <br />:yid "®Z9 <br />0 <br />0.2 <br />o.a <br />O.s Y <br />a <br />4 <br />0.8 ~ <br />.' <br />C <br />1 <br />1.2 <br />~ \`- Nov-Ot Dec-01 Jan-02 Feb-02 <br />Date <br />(~ \ <br />~, ;' Figure 2 - E/S WPCF post-rehabilitation measured flow and rainfall <br />'~, ~ <br />~'. Event Analysis <br />Figures 3 through 5 present the systemwide effectiveness of rehabilitation based on event <br />;: ; ~ analysis for flow from the E/S WPCF meter. The event analysis includes a comparison of <br />event, 7-day, and 3-day volume. A peak analysis on flow at the E/S WPCF is not worthwhile <br />~ : due to routing and spatial variation of rainfall. <br />,_ <br />~- '' The event analysis shows an RDII reduction effectiveness of 13%, 11 %, and 8%, for the <br />comparison with event, event plus 7-day, and event plus 30-day rainfall, respectively. This is <br />(" logical because longer antecedent periods include larger periods of "normal" (non-RDII <br />~--~, 16 <br />
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