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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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6/5/2009 11:15:22 AM
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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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dominated) periods that tend to reduce the overall percent difference. The pre-rehabilitation <br />trend line slopes in Figures 3 and 4 are influenced by the largest storm event. The other pre- <br />rehabilitation scatter points are in the same band as the post-rehabilitation points. Therefore, <br />the reduction estimates should be considered with caution. <br />E/S WPCF Basin <br />Pre- vs. Post-Rehabilitation Monitoring Results <br /> <br />450 <br /> <br /> <br />400 <br /> <br />350 <br /> <br />300 <br />V <br />250 <br />~ <br /> <br />> 200 <br />~ 1 <br />50 <br />100 <br /> <br /> <br />50 <br /> <br /> <br />0 <br /> <br />0.0 1.0 2.0 3.0 4.0 5.0 6.0 <br />Event Rainfall Volume (in) <br />Figure 3 - E/S WPCF pre- vs. post-rehabilitation event comparison (measured flow vs. event <br />rainfall) <br />Reduction = 13% <br />4 <br />y = 69.12x <br />y = 60.13x <br />o <br />4 <br />oPre-Rehabilitation <br />~ Post-Rehabilitation <br />17 <br />
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