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Theoretically, If it rained exactly one inch, many gallons of water would there be in a square mile?

Question #129072. Asked by libra29.
Last updated Jun 11 2021.
Originally posted Jan 19 2013 7:02 PM.

mlcmlc star
Answer has 4 votes
mlcmlc star
13 year member
103 replies avatar

Answer has 4 votes.
"A little over 17 million (17,378,743) gallons of water falls per square mile if the water is one inch deep." no longer exists

Response last updated by gtho4 on Jun 11 2021.
Jan 19 2013, 7:04 PM
1nn1 star
Answer has 5 votes
1nn1 star
11 year member
146 replies avatar

Answer has 5 votes.
It's easier if you convert to the metric system first.
1 Inch = 0.0254m
1 Sq mile = 2.59 sq km = 2 590 000 sq m
65786 m3 = 65 786 000 Litres

1 liter = 0.26417205 US gallons
1 liter = 0.21996919 UK (Imperial) gallons
Converting back
= 17 367 500 US Gallons
= 13 815 100 Imperial Gallons

Reference For converting liters into gallons

Jan 19 2013, 9:17 PM
sportsherald star
Answer has 6 votes
Currently Best Answer
sportsherald star
12 year member
693 replies avatar

Answer has 6 votes.

Currently voted the best answer.
This concept is similar to the "acre-foot" used in irrigation allocations, which is the volume of one foot (twelve inches) of water spread across an acre of land. One acre-foot equals 1233.4818375475 cubic metres, or 325851.42857143 US gallons, of water. Dividing these by twelve (for an "acre-inch") gives us 27154.285714286 US gallons, which is provided (along with many other conversions) at link

A square mile holds exactly 640 acres, so 640 x 27,154.285714286 = 17,378,742.8571264 US gallons (or 14,470,830.538448 Imperial gallons, or 65,785.69800253 cubic metres).

Jan 20 2013, 2:07 AM
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