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How big is 30 acre feet?

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It's about as big as The Capitol Rotunda (US).
(formally United States Capitol rotunda) (Washington, D. C.) (total chamber volume)
The Capitol rotunda measures 30 acre feet in total volume. Beneath the Capitol lies a crypt that was built to hold the remains of President George Washington, but according to his wishes, Washington was entered at his family home and the crypt remains empty.
It's about one-and-two-fifths times as big as The Lincoln Memorial Reflecting Pool.
In other words, 30 acre feet is 1.450 times the size of The Lincoln Memorial Reflecting Pool, and the size of The Lincoln Memorial Reflecting Pool is 0.690 times that amount.
(Washington, D.C.)
The Lincoln Memorial Reflecting Pool holds approximately 20.70 acre feet of water. The Pool has a sloping bottom and extends to 80 cm (30 in) deep in its center.
It's about three-fifths as big as Spaceship Earth (EPCOT Center).
In other words, the size of Spaceship Earth (EPCOT Center) is 1.70 times 30 acre feet.
(a.k.a. EPCOT Center) (Walt Disney World Resort, Lake Buena Vista and Bay Lake, Florida) (total structure volume)
Spaceship Earth, the iconic structure at the heart of Walt Disney World Resort's Epcot (formerly EPCOT Center), has a total volume of 50 acre feet. The outer structure of the sphere features a gutter system that channels all rainwater into nearby World Showcase Lagoon instead of simply falling off the surface of the sphere.
It's about two-fifths as big as Royal Albert Hall.
In other words, 30 acre feet is 0.42710 times the size of Royal Albert Hall, and the size of Royal Albert Hall is 2.3410 times that amount.
(a.k.a. Royal Albert Hall of Arts and Sciences) (Westminster, London, England, United Kingdom) (total auditorium volume)
Royal Albert Hall measures 70.250 acre feet in total auditorium volume. One of the centerpieces of the Hall is the Grand Organ — the second-largest organ in the United Kingdom, with 10,268 speaking pipes reaching up to 9.8 m (32 ft) in height.
It's about six-and-a-half times as big as The Goodyear Blimp.
In other words, 30 acre feet is 6.450 times the size of The Goodyear Blimp, and the size of The Goodyear Blimp is 0.1550 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 fifteen times as big as an Olympic Swimming Pool.
In other words, the size of an Olympic Swimming Pool is 0.067 times 30 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 seventeen times as big as a Hot Air Balloon.
In other words, the size of a Hot Air Balloon is 0.059 times 30 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).