how was its contribution to water control ?
The area is visited by flash floods, but archaeological evidence shows that the Nabataeans controlled these floods by the use of dams, cisterns and water conduits.
Petra
 The area is visited by flash floods, but archaeological evidence shows that the Nabataeans controlled these floods by the use of dams, cisterns and water conduits. 
where is the petra located on a map Southern Jordan. wat is this ? A historical and archaeological city.
wiki:11544971
Petra [SEP] Water control
Excavations have demonstrated that it was the ability of the Nabataeans to control the water supply that led to the rise of the desert city, creating an artificial oasis. The area is visited by flash floods, but archaeological evidence shows that the Nabataeans controlled these floods by the use of dams, cisterns and water conduits. These innovations stored water for prolonged periods of drought and enabled the city to prosper from its sale.