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MWIVtC FACILITIES PLAN <br /> <br />4.2.1 Historical Seasonal Loading Analysis <br />Historical loading data from May 1990 through May 2002 were evaluated, with <br />corresponding flow data, to determine average, maximum month, maximum week, and <br />maximum day BOD and TSS loads. The data analysis was broken up into dry and wet <br />weather seasons. The two seasons align with the effluent requirements as specified in the <br />WPCF's NPDES permit. Dry weather includes flows occurring between May 1 and <br />October 31. Historical dry weather average and maximum month loads are depicted in <br />Figure 4.2.1-1. Wet weather includes flows occurring between November 1 and April 30. <br />Historical wet weather average and maximum month loads are depicted in Figure 4.2.1-2. <br /> <br />FIGURE 4.2.1-1 <br />D~/Weather Maximum Month Loads <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> 60~000 <br /> <br /> t ". ....'~ · .... __ "~- .... <br /> 50,000 - · ' .. . .-- .. <br /> <br /> / <br /> 40,000 : / <br /> <br /> 30,000 +'~' * ..... <br /> 20,000 <br /> <br /> 10,000 <br /> <br /> 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 <br /> <br /> _--*-- Dry Weather Maximum Month E~OD Loading ~ Dry Weather Naximum Month TSS Loading <br /> <br />4-8 MWMC_4.0 REV9.C)OC <br /> <br /> <br />