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The result was a terrace providing "well-drained rich soil and a level surface for growing crops." [9] At prestigious or royal sites, such as Machu Picchu, finely cut stone was used as the outer (visible) face of the retaining wall. The planting surface of an andén is variable, but in the Colca Valley averages 3 metres (9.8 ft) wide. [10]
If the lowest terraces on which Patapatayoc and the town of Písac are located are included then the entire complex covers 65.5 hectares. If only the terraces and buildings that cover the upper part, then the size of the complex reduces to 24 hectares, of which the seven architectural complexes occupy a total of 4.3 hectares. [9]
Terraces were built to permit agriculture in the rugged terrain of the Andes. The heartland of the Inca Empire was in the high plateaus and mountains of the Andes of Peru. This area is mostly above 3,000 metres (9,800 ft) in elevation and is characterized by low or seasonal precipitation, low temperatures, and thin soils.
The first recorded accounts of Inca water transportation structures came from Spanish conquistadores in the sixteenth century. One such explorer was Pedro Cieza de León.In his published chronicles detailing his travels through Peru, he noted seeing a large wall as he headed east from Cuzco, which scholars argue he was referring to the aqueduct at the Piquillacta archeological site.
Fluvial terraces are elongated terraces that flank the sides of floodplains and fluvial valleys all over the world. They consist of a relatively level strip of land, called a "tread", separated from either an adjacent floodplain, other fluvial terraces, or uplands by distinctly steeper strips of land called "risers".
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The diurnal cycle of temperature is very wide, with maximum temperatures in the order of 12 to 24 °C (54 to 75 °F) and the minimum in the order of −20 to 10 °C (−4 to 50 °F). [citation needed] The coldest temperatures occur in the southwestern portion of the Altiplano during the winter months of June and July.