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2. Tainter gate - Wikipedia

   en.wikipedia.org/wiki/Tainter_gate

   Pressure forces on a submerged body act perpendicular to the body's surface. The design of the Tainter gate results in every pressure force acting through the centre of the imaginary circle of which the gate is a section, so that all resulting pressure force acts through the pivot point of the gate, making construction and design easier.

3. Rod (unit) - Wikipedia

   en.wikipedia.org/wiki/Rod_(unit)

   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.

4. Interstate Highway standards - Wikipedia

   en.wikipedia.org/wiki/Interstate_Highway_standards

   Median width: The median should have a width of least 50 feet (15 m), and preferably 60 feet (18 m), in rural areas, and 10 feet (3.0 m), plus a barrier, in urban or mountainous areas. Recovery areas : There should be no fixed objects in the clear zone , the width of which should be determined by the design speed in accordance with the current ...

5. Length - Wikipedia

   en.wikipedia.org/wiki/Length

   The millimetre (mm), centimetre (cm) and the kilometre (km), derived from the metre, are also commonly used units. In U.S. customary units, English or imperial system of units, commonly used units of length are the inch (in), the foot (ft), the yard (yd), and the mile (mi). A unit of length used in navigation is the nautical mile (nmi). [7]

6. Loading gauge - Wikipedia

   en.wikipedia.org/wiki/Loading_gauge

   The maximum height, width, and length of general Chinese rolling stock are 4,800 mm (15 ft 9 in), 3,400 mm (11 ft 2 in) and 26 m (85 ft 4 in) respectively, with an extra out-of-gauge load allowance of height and width 5,300 by 4,450 mm (17 ft 5 in by 14 ft 7 in) with some special shape limitation, corresponding to a structure gauge of 5,500 by ...

7. Floodgate - Wikipedia

   en.wikipedia.org/wiki/Floodgate

   height = the height of a non-submerged flood gate from the bottom of the water column to the water surface measured in metres. If the rectangular flood gate is submerged below the surface the same equation can be used but only the height from the water surface to the middle of the gate must be used to calculate the force on the flood gate.

8. Orders of magnitude (length) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(length)

   An adult human foot is about 28 cm (11 in) long. The decimetre ( SI symbol: dm ) is a unit of length in the metric system equal to 10 −1 metres ( ⁠ 1 / 10 ⁠ m = 0.1 m ). To help compare different orders of magnitude , this section lists lengths between 10 centimeters and 100 centimeters (10 −1 meter and 1 meter).

9. Foot (unit) - Wikipedia

   en.wikipedia.org/wiki/Foot_(unit)

   The Egyptian equivalent of the foot—a measure of four palms or 16 digits—was known as the djeser and has been reconstructed as about 30 cm (11.8 in). The Greek foot (πούς, pous) had a length of ⁠ 1 / 600 ⁠ of a stadion, [12] one stadion being about 181.2 m (594 ft); [13] therefore a foot was, at the time, about 302 mm (11.9 in). Its ...