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4. WASTEWATER CHARACTERISTICS
<br />
<br />· Wet Weather Peak Hour Flow---Determined by modeling the collection system at a 5-year,
<br /> 24-hour storm recurrence. The result of the modeling efforts is presented in the "Wet
<br /> Weather Peak Flow" technical memorandum.
<br />
<br />Tables 4.4-1 and 4.4-2 summarize the average and maximum month future projected flows
<br />and loads for both dry and wet seasons. These are the total flow and total load projections
<br />consisting of the residential, commercial, industrial, and I/I components. Peaking factors
<br />are not applied to the industrial portion of the overall flows and loads.
<br />
<br />TABLE 4.4-1
<br />Summary of Total Flow Projections (Residential, Commercial, and Industrial)
<br />MWMC Facilities Plan, Eugene-Springfield
<br />
<br /> 2050
<br /> Year 2005 2010 2015 2020 2025 (build-out)
<br />
<br />Estimated Population 229,145 246,255 263,365 280,475 297,585 383,135
<br />Wastewater Flow Projections (mgd)
<br />Average Dry Weather 29.6 31.8 34.0 36.2 38.4 49.4
<br />Max. Month Dry Weather 46.0 49.4 52.7 56.0 59.3 75.8
<br />Average Wet Weather 52.5 56.4 60.3 64.3 68.2 87.8
<br />Max. Month Wet Weather 85.7 92.0 98.2 104.5 110.8 142.1
<br />Peak Hour Wet Weather (Modeling)* 266 268.5 271 274 277 294
<br />
<br /> *The "modeling" values for wet weather peak hour flows are based on actual modeling results for 2005 and
<br /> 2025. For the purpose of planning at the WPCF, the intermediate peak flow values are interpolated. See '~/et
<br /> Weather Peak Flow" technical memorandum for additional discussion.
<br />
<br /> TABLE 4.4-2
<br /> Summary of Total Load Projections (Residential, Commercial, and Industrial)
<br /> MWMC Facilities Plan, Eugene-Springfield
<br />
<br /> 2050
<br /> Year 2005 2010 2015 2020 2025 (build-out)
<br />
<br /> Estimated Population 229,145 246,255 263,365 280,475 297,585 383,135
<br /> BOD Loading Projections (lb/day)
<br /> Average Dry Weather 42,400 45,600 48,700 51,900 55,000 70,900
<br /> Max. Month Dry Weather 57,500 61,600 65,700 69,900 74,000 94,500
<br /> Average Wet Weather 42,400 45,600 48,700 51,900 55,000 70,900
<br /> Max. Month Wet Weather 57,500 61,600 65,700 69,900 74,000 94,500
<br /> TSS Loading Projections (lb/day)
<br /> Average Dry Weather 47,000 50,500 54,000 57,500 61,000 78,500
<br /> Max. Month Dry Weather 68,000 73,000 77,800 82,800 87,600 112,200
<br /> Average Wet Weather 59,600 64,000 68,500 72,900 77,400 99,600
<br /> Max. Month Wet Weather 79,700 85,500 91,200 97,000 102,800 131,700
<br />
<br /> MWMC 4.0 REV9.DOC 4-13
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