This section is from the book "Commercial Gardening Vol3", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.

In square-built tanks the length by width by depth equals cubic contents. Each cubic foot by 6 1/4 equals number of gallons in tank. Thus a tank measuring 6 ft. long, 3 ft. wide, and 4 ft. deep contains 72 cub. ft., and 72 x 6 1/4 = 450 gal. = 4500 lb.

The following table gives the more exact number of gallons in square tanks, according to their dimensions - 1 gal. of water being reckoned at

6.232 lb.: -

Size of Tank. | Depth in Feet. | ||

Feet. | 3 ft. | 4 ft. | 5 ft. |

6 by 3 | 336 | 448 | 560 |

6 „ 4 | 448 | 598 | 747 |

6 „ 5 | 560 | 747 | 934 |

6 „ 6 | 673 | 897 | 1121 |

7 „ 4 | 523 | 698 | 870 |

7 „ 5 | 654 | 872 | 1090 |

7 „ 6 | 785 | 1047 | 1308 |

7 „ 7 | 916 | 1221 | 1526 |

8 „ 4 | 598 | 797 | 997 |

8 „ 5 | 747 | 997 | 1246 |

8 „ 6 | 897 | 1196 | 1495 |

8 „ 7 | 1046 | 1395 | 1744 |

8 „ 8 | 1196 | 1595 | 1994 |

9 „ 5 | 841 | 1121 | 1402 |

9 „ 6 | 1009 | 1346 | 1682 |

9 „ 7 | 1177 | 1570 | 1963 |

9 „ 8 | 1346 | 1794 | 2243 |

9 „ 9 | 1514 | 2019 | 2523 |

10 „ 5 | 934 | 1246 | 1558 |

Size of Tank. | Depth in Feet. | ||

Feet. | 3 ft. | 4 ft. | 5 ft. |

10 by 6 | 1121 | 1495 | 1869 |

10 „ 7 | 1308 | 1744 | 2181 |

10 „ 8 | 1495 | 1994 | 2492 |

10 „ 9 | 1682 | 2243 | 2804 |

10 „ 10 | 1869 | 2492 | 3116 |

11 „ 6 | 1233 | 1645 | 2056 |

11 „ 7 | 1439 | 1919 | 2399 |

11 „ 8 | 1645 | 2193 | 2742 |

11 „ 9 | 1850 | 2467 | 3084 |

11 „ 10 | 2056 | 2742 | 3427 |

11 „ 11 | 2262 | 3016 | 3770 |

12 „ 6 | 1346 | 1794 | 2243 |

12 „ 7 | 1570 | 2093 | 2617 |

12 „ 8 | 1794 | 2393 | 2991 |

12 „ 9 | 2019 | 2692 | 3365 |

12 „ 10 | 2243 | 2991 | 3739 |

12 „ 11 | 2467 | 3290 | 4113 |

12 „ 12 | 2692 | 3589 | 4487 |

To find the contents in gallons of circular tanks or wells it is necessary to square the diameter, multiply by the depth, and then multiply the result by 4'8947. Thus, a circular tank with a diameter of 4 ft. and a depth of 3 ft. would be measured thus: The diameter squared = 4 x 4 = 16. This multiplied by the depth = 16 x 3 = 48; and 48 x 48947 = 234.946 or say 235 gal.

The volume in cubic feet of a cylindrical tank, prism, or parallelepiped equals area of the base by height or depth. The area of the base equals the diameter squared x .7854. Therefore the volume of a circular tank with a diameter of 4 ft. and a depth of 3 ft. is found thus: Area of base = 4 x 4 x .7854 = 125664 sq. ft. Volume = 125664 sq. ft. x 3 ft. = 37.6992 cub. ft. Reckoning each cubic foot equals 6 1/4 gal. of water, the number of gallons in the tank = 37.6992 x 6.25 = 23662 gal. The following table gives the number of gallons contained in circular tanks or wells of various dimensions: -

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