urban Naeen. Qanats are mostly used in rural areas and/or for agriculture. Explosive migratory trends in Iran in the past 30 years have led to a wave of hasty urbanization inside the old quarters of ancient cities, destroying their original fabric. Some fare better than others though. Thus for example when comparing Qazvin to Yazd, Qazvin has fewer surviving ab anbars despite the fact that Yazd's ab anbars have been retired for much longer time spans. See also Ab anbar List of famous ab anbars of Qazvin Howz Kariz Qanat Yakhchal International rankings of Iran Iranian architecture Sanitation of the Indus Valley Civilization Terenah Nahrawan Canal References Further reading Memari e Islami e Iran. M. K. Pirnia. Minudar or Babuljanne. Gulriz, Mohammad Ali. Taha publications. 3rd printing. Qazvin. 1381 (2002). Qazvin: ayinah-yi tarikh va tabi’at-i Iran. Hazrati, Mohammad Ali. Sazeman e Irangardi va Jahangardi publications. Qazvin. 1382 (2003). Saimaa-yi ustaan-I Qazvain. Haji aqa Mohammadi, Abbas. Taha Publications. Qazvin. 1378 (1998). Memari-ye ab anbar haye shahr e Qazvin. Memarian, Gholamhosein. Asar. Vol 35. Iran Cultural Heritage Organization publications. Tehran. (p187-197). Sair e Tarikhi e banaayi Shahr e Qazvin va Banaha-yi an. Siyaghi, Dr. Seyd Mohammad Dabir. Iran Cultural Heritage Organization publications. Qazvin. 2002. Old ways of water management spring up again in arid regions. M.J. Strauss. International Herald Tribune. Aug 20, 2005. Canals in Iran Archaeology of Iran Archaeological features Ancient history of Iran Water supply and sanitation in Iran