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coming into the E/S WPCF (out of about 800 miles of sewer line, approximately 39 miles <br />have been rehabilitated by Eugene and 3-5 miles by City of Springfield). <br />Seasonal Analysis <br />Wet seasons or portions of wet seasons were selected to compare pre- (prior to summer of <br />1996) and post- (after the summer of 2001) rehabilitation. E/S WPCF measured flow data <br />from November 1995 to March 1996 were selected for the pre-rehabilitation time period and <br />from November 2001 to March 2002 and December 2002 to February 2003 for the post- <br />rehabilitation time period. Dry weather flows were selected from the summer period. August <br />1-8, 1994 was chosen as a representative sample for the pre-rehabilitation dry weather flow <br />time period and August 19-25, 2002 as a representative sample for post-rehabilitation. <br />Table 2 presents the results of the seasonal effectiveness assessment for the E/S WPCF Basin. <br />Both the 2001/2002 and 2002/2003 wet seasons show an approximate 15% decrease in total <br />volume per unit rainfall (MG/inch) as compared to the 1995/1996 wet season. <br />Table 2 <br />FJS WPCF Seasonal RDII Flow Reduction <br /> Dry Wet <br /> Weather Weather <br /> Total Measured Flow Flow Rainfall Wet Weather <br /> Flow Volume Volume Volume Accumulation Flow Volume/ <br /> MG MG MG inches Rainfall MG/inch <br />Pre-Rehabilitation <br />Nov 1, 1995 to Mar 1, 1996 8,071 2,740 5,331 37.7 141.0 <br />Post-Rehabilitation <br />Nov 1, 2001 to Mar 15, 2002 6,968 2,790 4,178 34.7 120.4 <br />Dec 1, 2002 to Feb 15, 2003 4,456 1,746 2,710 22.4 121.0 <br />Figures 1 and 2 show a portion of apre-rehabilitation wet season (1995-1996) total measured <br />flow and a portion of apost-rehabilitation (2001-2002) wet season total measured flow for the <br />E/S WPCF Basin. The pre-rehabilitation flow series generally exhibit higher peaks and <br />troughs than the post-rehabilitation series. <br />15 <br />