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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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recommendations and prioritizations. Reductions that have been achieved in Eugene generally <br />exceed cited experience from agencies in other Cities and States. However, comparisons are <br />tenuous and must consider differences in extent, objectives, and quality of rehabilitation <br />practices. <br />Based on the results of this analysis, it is reasonable to conclude that the City of Eugene's <br />rehabilitation program has been successful and in most cases equals or exceeds the <br />WWFMP's RDII removal estimates. The estimate was presented in Figure 5-10 of the <br />WWFMP report as a graph with rehabilitation as a percentage of total pipe on the X-axis and <br />percent reduction in RDII volume on the Y-axis. Table ES-2 includes the excerpt from Figure <br />5-10 in the WWFMP report along with results achieved based on the current analysis. <br />Table ES-2 <br />Event RDII Volume vs. Rainfall Achieved Compared to WWFMP Predictions <br />(Excerpts from Figure 5-10 in the WWFMP) <br /> Percent of Total Pipe WWFMP Estimated Achieved <br /> Rehabilitated RDII Volume (%) <br /> (%) Reduction Public Only <br /> System* <br /> (%) <br />Sub-basin 84 49 26 <br />DA-21 <br />Sub-basin 64 44 43 <br />DA-22 <br />Sub-basin 91 50 71 <br />DA-23 <br />Sub-basin 56 42 59 <br />DA-24 <br />* Public Only System Rehabilitation recommended by WWFMP <br />5 <br />
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