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The rod, perch, or pole (sometimes also lug) is a surveyor's tool [1] and unit of length of various historical definitions. In British imperial and US customary units, it is defined as 16 + 1 ⁄ 2 feet, equal to exactly 1 ⁄ 320 of a mile, or 5 + 1 ⁄ 2 yards (a quarter of a surveyor's chain), and is exactly 5.0292 meters.
Rood is an English unit of area equal to one quarter of an acre [2] or 10,890 square feet, exactly 1,011.7141056 m 2. A rectangle that is one furlong (i.e., 10 chains , or 40 rods) in length and one rod in width is one rood in area, as is any space comprising 40 perches (a perch being one square rod).
As the name suggests, an acre-foot is defined as the volume of one acre of surface area to a depth of one foot. Since an acre is defined as a chain by a furlong (i.e. 66 ft × 660 ft or 20.12 m × 201.17 m), an acre-foot is 43,560 cubic feet (1,233.5 m 3). There has been two definitions of the acre-foot (differing by about 0.0006%), using ...
The only thing that changed was the number of feet and yards in a rod or a furlong, and the number of square feet and square yards in an acre. The definition of the rod went from 15 old feet to 16 + 1 ⁄ 2 new feet, or from 5 old yards to 5 + 1 ⁄ 2 new yards. The furlong went from 600 old feet to 660 new feet, or from 200 old yards to 220 ...
The 66-foot (20.1 m) chain is divided into 100 links, usually marked off into groups of 10 by brass rings or tags which simplify intermediate measurement. Each link is thus 7.92 inches (201 mm) long. A quarter chain, or 25 links, measures 16 feet 6 inches (5.03 m) and thus measures a rod (or pole).
The only exceptions to this rule are special requirements for measurement in feet in mineral surveys and townsite surveys. [13] Linear Measurement 1 Chain = 100 links or 66 feet 1 Mile = 80 chains or 5,280 feet. Area Measurement 1 Acre = 10 square chains or 43,560 square feet 1 square mile = 640 acres
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It comes from irrigation. If you are going to grow rice in a dry area, you need one acre-foot of water to flood a one acre rice field one foot deep with water. Or the equivalent of 12 inches of rainfall.Eregli bob 14:15, 23 August 2013 (UTC) If you are growing rice in a wet area, it still takes an acre-foot of water to flood a 1 acre field to a ...