How many million gallons per day (MGD) does one cubic foot per second equate to?

To determine how many million gallons per day (MGD) one cubic foot per second (CFS) equates to, we can start with the fact that one cubic foot contains approximately 7.48 gallons.

First, we can calculate the number of gallons per second that one cubic foot per second would produce:

1 CFS = 1 cubic foot per second × 7.48 gallons/cubic foot = 7.48 gallons per second.

Now to convert gallons per second to gallons per day, we need to multiply by the number of seconds in a day. There are 86,400 seconds in a day (60 seconds per minute × 60 minutes per hour × 24 hours per day):

7.48 gallons/second × 86,400 seconds/day = 645,504 gallons/day.

Finally, to convert this value into million gallons per day, we divide by 1,000,000:

645,504 gallons/day ÷ 1,000,000 = 0.645504 MGD.

Rounding this, we find that one cubic foot per second is approximately equivalent to 0.646 MGD. This makes the selection of 0.646 MGD the correct response.