Which statement about 1 MGD is correct?

Which statement about 1 MGD is correct?

• A. 1 MGD equals 800 gpm and 1.5 cfs
• B. 1 MGD equals 500 gpm and 0.9 cfs
• C. 1 MGD equals 694 gpm and 1.55 cfs
• D. 1 MGD equals 1000 gpm and 2.0 cfs

Answer: (C)

Understanding how to convert between MGD, gpm, and cfs uses straightforward time and volume relationships: a day has 1440 minutes and a cubic foot holds 7.4805 gallons. Start with 1,000,000 gallons per day. Divide by 1440 to get gallons per minute: 1,000,000 ÷ 1440 ≈ 694.4 gpm. To get cubic feet per second, convert gallons to cubic feet (1,000,000 ÷ 7.4805 ≈ 133,680 ft³ per day) and then divide by the seconds in a day (133,680 ÷ 86,400 ≈ 1.55 cfs). Rounded, 1 MGD equals about 694 gpm and about 1.55 cfs. This matches the statement, making it the correct one. Other values would correspond to different daily totals (for example, 800 gpm is about 1.15 MGD), so they don’t fit 1 MGD.

Understanding how to convert between MGD, gpm, and cfs uses straightforward time and volume relationships: a day has 1440 minutes and a cubic foot holds 7.4805 gallons. Start with 1,000,000 gallons per day. Divide by 1440 to get gallons per minute: 1,000,000 ÷ 1440 ≈ 694.4 gpm. To get cubic feet per second, convert gallons to cubic feet (1,000,000 ÷ 7.4805 ≈ 133,680 ft³ per day) and then divide by the seconds in a day (133,680 ÷ 86,400 ≈ 1.55 cfs). Rounded, 1 MGD equals about 694 gpm and about 1.55 cfs. This matches the statement, making it the correct one. Other values would correspond to different daily totals (for example, 800 gpm is about 1.15 MGD), so they don’t fit 1 MGD.