The famed Persian irrigation tunnels are considered to be one of the world's oldest engineering marvels and are on Unesco’s World Heritage list, writes Loukia Papadopoulos. The Persian qanats, added to Unesco’s World Heritage list two years ago, are one of the world's oldest engineering marvels. Consisting of an ancient system of water sourcing underground tunnels, these 3,000-year-old ingenious channels still provide a reliable supply of water for some of Iran's most arid regions. [caption id="attachment_44411" align="alignright" width="300"] Source: Unesco/SH Rashedi[/caption] Qanats began in the Iron Age when surveyors discovered that a source of water at the head of a river valley could be redirected to create tunnels that would bring the stream to where water was wanted, ultimately opening on ground level into an oasis. Today, the qanats are known by the holes, created as air shafts to release dust and bring oxygen to workers digging the tunnels by hand, that can still be witnessed above ground.

An integral part of Iran

Iranian filmmaker Komeil Soheili has documented the Persian qanats for 'National Geographic'. He told the publication that he believes they are an "integral part" of the landscape of his Iranian native province. “The diversity of landscapes and cultures [in Iran] is something that’s not well understood by the world. One of the oldest civilisations in the world came from this amazing creation," he said. The 11 Persian qanats that constitute this impressive elaborate and orderly system also include rest areas, water reservoirs, and watermills. Building this network, however, was no easy feat. Each qanat construction requires great precision as the angles of the tunnels' slopes need to be at just the right degree to ensure water flows freely but not forcefully enough to aggravate erosion and collapse the tunnel. To this day, the somewhat fragile system still requires yearly maintenance and can easily fall into disrepair. In the 1960s and 1970s, an administrative tangle saw damage come to many qanats as a result of the breakdown of their traditionally imposed communal management system. Soheili said this breach was partially due to the disappearance of communities' reliance on the tunnels. “People don't depend on qanats any more, as it was before," he explained. Today, the underground channels are more of a 'hobby' since working in the system no longer provides financial sustenance.

Vibrant lavish civilisations

Their historical and cultural impact, however, can not be denied. The irrigation tunnels were responsible for allowing civilisations and agriculture to bloom in a harsh and arid desert hostile to both. Perhaps their most substantial effect can be witnessed in the history of the city of Persepolis located in the Fars province of southwest Iran. The metropolis built by the Achaemenid Persians in a dry desolate and unforgiving area became one of the most vibrant cultured cities in the world still revered today for its unique palaces equipped with lavish gardens that bloomed with unparalleled beauty. [caption id="attachment_44412" align="alignright" width="300"] Source: Unesco/ SH Rashedi[/caption] The qanat technology also spread as far as Morocco and Spain, proving its ubiquitous usefulness and appeal. This is partially due to the fact that the system also helps lower indoor temperatures, which meant it was often used as an ancient method of air conditioning and refrigeration. Talk about innovation. This article was written by Loukia Papadopoulos and is reproduced with kind permission from Find the link to the original article here.