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Grading in civil engineering and landscape architectural construction is the work of ensuring a level base, or one with a specified slope, [1] for a construction work such as a foundation, the base course for a road or a railway, or landscape and garden improvements, or surface drainage.
Grade 1, 2 and 3a, are referred to as 'Best and Most Versatile' land, and enjoy significant protection from development. Grade 4 and 5 are described as poor quality agricultural land and very poor quality agricultural land
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Grade is usually expressed as a percentage - converted to the angle α by taking the inverse tangent of the standard mathematical slope, which is rise / run or the grade / 100. If one looks at red numbers on the chart specifying grade, one can see the quirkiness of using the grade to specify slope; the numbers go from 0 for flat, to 100% at 45 ...
The Inca people built on these, developing a system of canals, aqueducts, and puquios to direct water through dry land and increase fertility levels and growth. [10] These terraced farms are found wherever mountain villages have existed in the Andes.
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