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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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Figures 6 and 7 show a portion of apre-rehabilitation wet season (1994-1995) total measured <br />flow and a portion of apost-rehabilitation wet season (2002-2003) total measured flow for the <br />DA Basin. The pre-rehabilitation flow series generally exhibit higher peaks and troughs than <br />the post-rehabilitation series. The 1994-95 season includes multiple peak events above 30 cfs <br />while the 2002-03 season exhibits none. <br />50 <br />0 <br />0.2 <br />0.4 <br />0.6 <br />i <br />V <br />i <br />V <br />0.8 ~ <br />^ <br />.* <br />s <br />i <br />tz <br />40 <br />7; <br />8 <br />V <br />^ <br />W <br />z6 <br />io <br />0 <br />Dec-94 Jan-95 Fab-95 <br />Date <br />Figure 6 - DA basin pre-rehabilitation measured flow and rainfall <br />50 <br />40 <br />30 <br />D <br />b <br />7 <br />~ 20 <br />10 <br />0 <br />Dec-01 Jan-02 Feb-02 <br />Date <br />Figure 7 - DA basin post-rehabilitation measured flow and rainfall <br />0 <br />0.2 <br />0.4 <br />0.8 ~j <br />4 <br />0.6 ~ <br />i <br />C <br />1 <br />1.2 <br />Event Analysis <br />Storm events in the DA basin were chosen to compare pre- (prior to summer of 1997) and <br />post- (after the summer of 2001) rehabilitation. Eight storms were selected for the pre <br />20 <br />
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