The complete scheme provided water for fifty years in advance, and a maximum of 75 million gallons a day was taken into account, in addition to 27 million gallons for compensation water to the river.
AREA] For a couple of days in September, however, the Potomac's flow reached an all-time low of about 390 million gallons a day.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "million gallons" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.