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EXECL~rVE SUM~U~RY <br /> <br />commercial, and infiltration/inflow (I/I)] projections were estimated based on population <br />projections and selected per capita and peaking factors. <br /> <br />Based on the method of projecting dry season flows, using actual historical data and <br />statistical analysis, the projected flows during the wettest dry season month at 2025 is less <br />than those projected using either the Oregon Department of Environrnental Quality (DEQ) <br />guidelines or the lirwited data that was used in the 1997 Master Plan (Figure ES-I). <br /> <br /> Dry Season Haxirnurn Honth Flow <br /> Historical and Projected <br /> <br /> ~ 60~70-5 .................... <br /> ~ 40 <br /> <br /> 20~ -- - ~ 2004 Facilities P]an~ DEq ~ethodo~ogy <br /> 10~ ~ 1997 ~aster P~an ~ Historical Data <br /> <br /> 1990 2000 2010 2020 <br /> Year <br /> <br /> F~URE <br /> F~ <br /> <br />A 2003-04 collection system modeling effort indicated that wet weather peak hour (WWPH) <br />flows generated in the collection system associated with the 5-year, 24-hour winter storm <br />event were comparable to those projected in the WWFMP. This is the flow that must be <br />treated under DEQ guidelines without resulting in sanitary sewer overflows (SSOs). The <br />best current estimate of the 2025 WWPH flow at the WI~F is 277 mgd. Based on this <br />projection, the WPCF faces a peak flow capacity deficit in a number of ~reatment process <br />areas, which are summarized in Figure ES-2. <br /> <br />Consistent with the WWFMP, the 2003-04 analysis showed that collection system capacity is <br />limited primarily at the Willakenzie pump station and WPCF irffiuent screw pumps. <br />Additional local (i.e. city) collection system upgrades will be needed at several of the other <br />major local pump stations prior to 2025 to meet DEQ capacity requirements. The needs for <br />these additional improvements have been identified as part of this Facilities Plan but are the <br />responsibility of the individual cities. <br /> <br />MWMC_EXECSUM_REV4~2_ DOC ES-3 <br /> <br /> <br />