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SE Engineers
PO Box 10776
Bozeman, MT 59718
04/09/21
Midwest Welding and Machine Peak Hour Demand
• Building Average Daily Demand (Qave)
o General Business and office facilities = 25 gal/ employee/shift)
(ref: 15A NCAC 02T.0114 Wastewater Design Flow Rates - see attached)
▪ 32 Employees (per Midwest Welding)
▪ 1 shift (per Midwest Welding)
▪ Qave = 25 gal x 32 Employees
▪ Qave = = 800 gal/ day
• Peaking Factor (Qmax/Qave) = (18 + P1/2) / (4 + P½)
(ref: Design Standards and Specifications Policy; City of Bozeman March 2004)
o P = Population in thousands
o P = 32 employees (from Midwest Welding) = 0.032 Thousand of People
o Qmax = ((18 + 0.179) / (4 + 0.179)) x 800
o Qmax = 4.35 x 800
o Qmax = 3,480 gal/ day
SE Engineers
Bill Edden, PE
Owner, Mechanical Engineer