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How big is 811 acre feet?

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It's about 150 times as big as The Goodyear Blimp.
In other words, 811 acre feet is 174 times the size of The Goodyear Blimp, and the size of The Goodyear Blimp is 0.00575 times that amount.
(for GZ-20A) The Goodyear GZ-20 model Blimp measures 4.650 acre feet in total volume. A December, 1929 college football game between the University of Florida Gators and the University of Oregon Webfoots (later the University of Oregon Ducks) began with the blimp dropping a parachute-equipped ball from a height of 61 m (200 ft) to the field below.
It's about 400 times as big as an Olympic Swimming Pool.
In other words, the size of an Olympic Swimming Pool is 0.0025 times 811 acre feet.
(FINA regulation; (minimum capacity)
According to the Fédération Internationale de Natation (FINA), a swimming pool for Olympic and world championship events must measure 50 m by 25 m with a depth of at least 2 m for a total volume of 2 acre feet. A pool of this size was to be used in Olympic time trials in New Jersey in early 2008, but its component pieces were stolen from a warehouse, likely to be sold for scrap metal.
It's about 450 times as big as a Hot Air Balloon.
In other words, the size of a Hot Air Balloon is 0.0022 times 811 acre feet.
(four-person capacity; envelope volume; average)
The average volume of a hot air balloon sufficient to lift four adults is 1.80 acre feet. Typically made of nylon or dacron, a balloon envelope of this size typically weighs just 88 kg (190 lbs).
It's about one-five-hundred-fiftieth as big as Sydney Harbour.
In other words, 811 acre feet is 0.00178 times the size of Sydney Harbour, and the size of Sydney Harbour is 562 times that amount.
(formally Port Jackson, a.k.a. Sydney Harbor) (Sydney, New South Wales, Australia) (total estuary water volume at high tide)
Lending the term "sydharb" or "sydarb" to comparable quantities of water, Sydney Harbor contains approximately 456,000 acre feet of water. Snapper Island, a onetime naval facility loocated in the Harbour, was transformed by the dredging efforts of the Australian Navy from a 2,360 sq. m (25,400 sq. ft) outcropping to a 16,500 sq. m (178,000 sq. ft) island shaped roughly in the outline of a boat.
It's about 90,000 times as big as a Concrete Mixer Truck.
In other words, 811 acre feet is 91,000 times the size of a Concrete Mixer Truck, and the size of a Concrete Mixer Truck is 0.0000110 times that amount.
(a.k.a. cement mixer, a.k.a. cement mixer truck, a.k.a. cement transport truck, a.k.a. concrete mixer, a.k.a. concrete transport truck, a.k.a. in-transit mixer)(standard size; drum capacity)
A concrete mixer truck has a drum volume of up to 0.0089 acre feet. Concrete mixer trucks can be in transit for about 90 minutes before the concrete dries — if the concrete dries while in the drum, jackhammers or even dynamite must be used to remove it.
It's about 1,500,000 times as big as a Hot Tub.
In other words, 811 acre feet is 1,390,000 times the size of a Hot Tub, and the size of a Hot Tub is 0.0000007190 times that amount.
(for Lifesmart Rock Solid Simplicity Plug and Play 4 Person Spa With 12 Jets) (a.k.a. Spa, a.k.a. Jacuzzi, a.k.a. Whirlpool) (Advertised Capacity)
An average, four-person hot tub holds 0.000583 acre feet of water. Modern hot tubs became popular outside of Japan starting in about 1940.
It's about 0.0000003 times as big as an Halley's Comet.
In other words, 811 acre feet is 0.000000250 times the size of an Halley's Comet, and the size of an Halley's Comet is 4,000,000 times that amount.
(Comet Halley, officially "1P/Halley") (volume calculated based on 2005 dimensions)
Halley's Comet, the famous comet visible to observers on Earth approximately every 76 years, has a peanut- or potato-shaped nucleus made of rock, dust, ice, and various frozen gasses. The nucleus measures approximately 15 km by 8 km by 8 km, which yields a calculated volume of 3,300,000,000 acre feet. The coma of the Comet — the trail of sublimated gasses that give the Comet its visibility — may be up to 100,000 km in length.