Basic Units of Measurement and Conversions - Basic Mathematics for Water and Wastewater Operators - page 19

Problem: The flow rate entering the grit channel is 2.89 MGD. What is the flow rate
in cubic feet per second?

Solution:

Flow = 2.89 MGD × 1.55 cfs/MGD = 4.48 cfs

■ Example 2.19
Convert gallons per minute to million gallons per day.

Flow (gpm) 1440 min/day
1,000,000

×

Flow (MGD) =

gal/MG

Problem: The flow meter indicates that the current flow rate is 1469 gpm. What is the
flow rate in million gallons per day?

Solution:

Flow (gpm) 1440 min/day
1,000,000 gal/M

×

Flow =

G
1469 gpm 1440 min/day
1,000,000 gal/MG

×

= = 2.12 MGD

■ Example 2.20
Convert gallons per day to million gallons per day.

Flow (gal/day)
1,000,000 gal/MG

Flow (MGD) =

Problem: The totalizing flow meter indicates that 33,444,950 gal of wastewater have
entered the plant in the past 24 hr. What is the flow rate in million gallons per day?

Solution:

Flow (gal/day)
1,000,000 gal/MG

33,444, 950 gal/day

1,000,000 gal/MG

Flow = = = 33.44 MGD

■ Example 2.21
Convert flow in cubic feet per second to million gallons per day.

Flow (cfs)
1.55 cfs/MG

Flow (MGD) =