qanat
· As early as 3000 BC, a system of irrigation began in Persia called the qanat. · Qanats are underground tunnels, with a canal in the floor of the tunnel, which carries water. · At regular intervals, well-like openings extend from the surface to the tunnel floor, and it is through these openings that the tunnels were built and through which they are maintained. · The underground nature of the canal reduces evaporation in the hot and windy desert, and allows 22,000 qanats to operate in Iran even today. · Qanats originate in highlands, with a mother shaft as deep as 400 metres, and the tunnel floor slopes at a moderate angle toward its destination, which can be up to 160 kilometres away. · The difference between the qanat and a surface canal is that the qanat can get water from an underground aquifer, so a surface river or stream is not needed. · Since it travels at a slope independent of the surface features, it can go in a straight line. The water carrying canal in qanats were usually lined with stone or tile to reduce water loss. · The control of water was a key issue to Persian agriculture, and documents demonstrated that Darius and Xerxes authorising the mass construction of qanats at Manâwir in Egypt in an effort to increase agricultural production.
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Wore it to school.
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| XS | 27" | 16½" |
| S | 28" | 18" |
| M | 29" | 20" |
| L | 30" | 22" |
| XL | 31" | 24" |
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| XS | 69 cm | 42 cm |
| S | 71 cm | 46 cm |
| M | 74 cm | 51 cm |
| L | 76 cm | 56 cm |
| XL | 79 cm | 61 cm |
| 2XL | 81 cm | 66 cm |
| 3XL | 84 cm | 71 cm |