2024.10.14_ CK Yelm STEP SizingDesign Flow Rate:
325 gpd/toilet
8 toilets
Total = 2,600 gpd
Liquid Detention Volume:
2 x peak day flow (per DOE Orange Book C1-10.1.5.)
2,600 gallons
5,200 gallons
Working Volume:
Working Volume must exceed the difference between the peak influent flow and discharge of the pump over the peak duration.
QDesign * ((18+sqrt(P)/(4+sqrt(P))) where P = Population in Thousands
(2925 gpd) * (18+sqrt(0.4))/(4+sqrt(0.4)) / 24hrs/day = 8.17 gpm
10 gpm per P.110 0511 OSI Pump
Peak Discharge > Peak Inflow ---> Okay
Working Volume = 0 gallons
Storage Volume:
Storage Volume shall equal 24 hours of Peak Daily Inflow for emergency storage.
2,600 gpd
Total Tank Volume Required:
Sum of Liquid Detention Volume, Working Volume, and Storage Volume. Liquid Detention Volume not to exceed 65% to 75% of total volume.
5,200 gallons 58%
0 gallons 0%
2,600 gallons 29%
7,800 gallons
3 x 3,000 gallon tank
Total Volume =
STEP Sewer Tank Sizing Calculation
10/14/2024
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Assumed Peak Discharge =
Storage Volume =
Liquid Detention Volume =
Working Volume =
Storage Volume =
Sizing per Ciriteria for Sewage Works Design (DOE Orange Book), Section C1-10.1.5.
Peak Daily Flow =
Minimum Liquid Volume =
Minimum Liquid Volume =
Assumed Peak Inflow =