By: Hanan
Rawashdeh
Petra the ancient city is one of the world’s
seven wonders. What makes it so unique? And how is it that a city so secluded
within the canyon walls in the middle of the hot desert South West of Jordan
with no close surface water to be able to maintain a lively civilization of
20-30,000 dwellers?
Although the strategic location of the ancient
city is understandable in terms of the economic factor with the trade route
going through the city, living conditions are very challenging as the very dry
desert climate is hot with only a few inches of precipitation yearly. And
sometimes these four to five inches of annual rain would drop all at once
causing a flash flood. The topography is a rocky region filled with huge gorges
of sandstone and scarce with greenery. Nomadic tribes were known to wonder the region
looking for water sources due to the nature of the climate in the southern part
of Jordan. Therefore in order for a city as large as Petra to withhold such
numerous activities and flourish with civilization the Arab Nabateans had to
find a way to engineer water to constantly flow and get stored easily within
the region of the city and provide protection from any flash floods.
Scholars believe ceramic
joints making a pipeline were used to transport water. Like a perennial stream,
this distribution system and water supply of the Nabataean
city of Petra had exploited all possible water resources using management
techniques that balance reservoir storage capacity with continuous flow
pipeline systems to maintain a constant water supply throughout the year.
Hydraulic technologies
helped maintain the high living standard of city dwellers throughout the
centuries. Charles
Ortloff , a hydraulic engineer, found that to create a constant flow that wasn’t too
fast to fill the water pipes and create pressure that could lead to leakage the
pipes needed to be sloped down an angle of four degrees. Remarkably when going
back to the carved water channels he found that the Nabataeans had that same
slope degree, proving to be masters in hydro engineering.
Ueli Bellwald , a Swiss architect and
archeologist believes that there were five dams constructed of blocks of mortar
were constructed to prevent the flash floods from ruining
the city after discovering the remnants
of a dam going back to two thousand years old.
He claims that clues of existing dams erected
between the narrow gorges can be noted from the streaks of darker colored rocks
on the canyon walls indicating the existence of Mineral
deposits from previous
water storage. When he followed the darker colored streaks he was led to a
gorge that had two deep grooves carved inside, concluding that there was a dam
had previously held the water reservoir into place anchored into the canyon
walls to stand against the pressure of the stored water.
Scholars came to a presumption that the total of water sources in
Petra city are 8 springs for fresh water, 36 dams protection, more than 100
systems of reservoirs and 125miles of piping. By estimating the amount of
collected waters through these methods approximately two gallons of water was
the daily share of every individual of the 30,000 Petra dwellers. That is
enough water to create from this desert city and oasis.
The Hydraulic system in the ancient is a demonstration
of high engineering
capability that indicates a high degree of cognitive skill which the Nabataea
Arabs had in solving complex hydraulic problems and ensuring a stable water
supply around 2,000 years ago.
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