 Uncontrolled growth and expansion of Tehran created a situation where the existing water resources at Karaj, Latyan and Lar dams and the deep wells which were supposed to be exploited only in the during the peak water consumption period.These were no longer capable of meeting the city's water demand, so inevitable abstraction from ground resources started to increase in a manner that at the present situation, the quantity of drilled deep wells has amounted to 230 rings.In fact, from 1997-2000, it had been orderly abstracted, 317, 289, 374 and 357 MCM (million cubic metres) of water from groundwater resources of the city.