2020 Eugene Wastewater Master Plan Chapter 4: Design Criteria 34 <br />Example Calculation <br />The following is an example calculated using wastewater flow rates in Table 4-3: <br />Preliminary development plan for a site containing 100 gross acres: <br />• 10 acres Neighborhood Commercial <br />• 10 acres Light-Medium Industrial <br />• 60 acres Low-Density Residential <br />• 20 acres Medium-Density Residential <br />Land Use Site Area <br />(Gross Acres) <br />Base Flow Rate <br />(Gal/Acre/Day) <br />Average Dry Weather Flow <br />(1,000 Gal/Day) <br />Low-Density Residential 60 600 36.0 <br />Medium-Density Residential 20 1,605 32.1 <br />Neighborhood Commercial 10 1,360 13.6 <br />Light/Medium Industrial 10 3,040 30.4 <br />Total Average Base Flow (Kgal/day) = 112.1 <br />Peak Base Flow (Kgal/day)1 = 354.7 <br />Infiltration (Kgal/day)2 = 200.0 <br />Peak Design Flow (Kgal/day) = 554.7 <br />Peak Design Flow (CFS) = 0.860 <br />1 Peak Flow Factor = 25 - 20.2 (112.1)0.0165 <br />2 Infiltration = 100 gross acres at the rate of 2,000 GAD <br />