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How big is 811 acre feet?

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It's about 0.0000003 times as big as The Grand Canyon.
In other words, 811 acre feet is 0.000000240 times the size of The Grand Canyon, and the size of The Grand Canyon is 4,170,000 times that amount.
(Coconino County and Mohave Counties, Arizona, near Fredonia and Grand Canyon, Arizona)
A dynamic and continuously changing landscape, the Grand Canyon has an approximate volume of 3,380,000,000 acre feet. The strata of the rock visible in the Canyon's walls display nearly 2 billion years of geological history.
It's about 6,500,000 times as big as a Bathtub.
In other words, the size of a Bathtub is 0.000000160 times 811 acre feet.
(a.k.a. bath, a.k.a. tub) (for Bootz Industries Aloha 5 ft. Left Hand Drain Soaking Tub)
The capacity of a typical bathtub is 0.00013 acre feet. Historically, bathtubs have been made of various materials including marble, terracotta, silver, gold, and iron but the size and shape of the tubs has changed little in their 7,000 year history.
It's about 15,000,000 times as big as a Car Gas Tank.
In other words, 811 acre feet is 13,200,000 times the size of a Car Gas Tank, and the size of a Car Gas Tank is 0.00000007580 times that amount.
(for 2009 Ford Taurus)
A car gas tank (for example, that of a 2009 Ford Taurus) holds 0.00006140 acre feet of gas. In contrast, the Curved Dash Oldsmobile — the first mass-produced car — had a fuel capacity of just 0.00001620 acre feet.
It's about 15,000,000 times as big as a Beer Keg.
In other words, the size of a Beer Keg is 0.00000005880 times 811 acre feet.
(Half barrel; maximum capacity)
The most common keg size sold by US beer sellers is a half-barrel type with a volume of 0.00004760 acre feet. This type of keg contains the equivalent of 165 0.0000002880 acre feet cans of beer.
It's about 90,000,000 times as big as a Basketball (packed).
In other words, 811 acre feet is 90,119,211.9250 times the size of a Basketball (packed), and the size of a Basketball (packed) is 0.0000000110964130580 times that amount.
(64% packing density) (NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball measures about 0.00000575948223350 acre feet. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about 100,000,000 times as big as a Bowling Ball (packed).
In other words, 811 acre feet is 121,500,212.630 times the size of a Bowling Ball (packed), and the size of a Bowling Ball (packed) is 0.00000000823043827130 times that amount.
(64% packing density) (USBC specifications; tenpin)
According to United States Bowling Congress specifications, a tenpin bowling ball should measure at least 10.795 cm (4.25 in) in radius for a total volume of about 0.00000427192668030 acre feet. Because regulation balls measure the same diameter irrespective of their weight, ball density varies by size and balls weighing less than about 5 kg (11 lbs) will float in water.
It's about 150,000,000 times as big as a Basketball.
In other words, 811 acre feet is 140,811,268.640 times the size of a Basketball, and the size of a Basketball is 0.00000000710170435690 times that amount.
(NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball and measures about 0.00000575948223350 acre feet. The surface of these balls have 4,118 pebbles with a diameter of 2.5 mm each.