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TABLE 7.2.1-1 <br /> Liquid Processes Design Criteria, Existing and 2025 Capacity Needs <br />· MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Unit Process Existing Criteria/Conditions Year 2025 <br /> <br /> FLOW CONDITIONS <br /> Design Flows <br /> DWA 49 mgd 38.4 mgd <br /> WWA 70 mgd 68.2 mgd <br /> <br /> WWMM NA 110.8 mgd <br /> WWPH 175 mgd 300 mgd <br /> PRELIMINARY TREATMENT <br /> Mechanical Bar Screens <br /> Clear opening Y2" Y2" <br /> Number of 4.5 foot-wide units 6 6 <br /> Capacity, each 35 mgd 35 mgd <br /> Clear opening ~,4" ~,~, <br /> Number of units NA 4 <br /> Maximum Capacity, each NA 40 mgd <br /> Washer/Compactor <br /> Number of Units 2 4 <br /> Capacity 2 @ 2,000 gpm 2 @ 2,000 gpm <br /> 2@ <br /> Screenings Conveyor <br /> Number of Units and Size 3 @ 300 gpm 3 @ 300 gpm <br /> Type Sluice Water Pumps Sluice Water Pumps <br /> Horsepower <br /> Drive <br /> Total 900 gpm 900 gpm <br /> Firm (largest unit out) 600 gpm 600 gpm <br /> PLANT INFLUENT FLOW MEASUREMENT <br /> <br /> Type Parshall Flumes Downstream Parshall Flumes Downstream <br /> of Influent Screens of Influent Screens <br /> Size 4 @ 6 fi-wide throat 8 @ 6 ft-wide throat <br /> GRIT REMOVAL <br /> Grit Chambers <br /> Design criteria 2.5 min HRT @ QWSpH 2.5 rain HRT @ QWSPH <br /> Number to meet design criteria 2 2 <br /> Total number installed 4 4 <br /> Length x Width 85-fi x 13-ft 85-ft x 13-ft <br /> Volume, each 101,000 gal 101,000 gal <br /> Total Volume 404,000 gal 404,000 gal <br /> Capacity, each 58.3 mgd 58.3 mgd <br /> Actual HRT @ QWsPH, all grit bays in service 2.16 rain @ QWVVPH-2005 2.16 min @ QV~NPH-200S <br /> Actual HRT @ QwsPH, with redundancy 1.62 min @ QwwPH-2OO5 1.62 min @ QWWPH-2005 <br /> <br /> MWMC_TABLE 7.2.1-1_REV7.DOC 1 <br /> <br /> <br />