Document Type : Research Paper


1 Professor, Department of Watershed Management Engineering, Faculty of Natural Resources, Yazd University, Yazd, Iran

2 Assist. Professor, Department Environment, Faculty of Natural Resources, Yazd University, Yazd, Iran

3 M.Sc. Alumni, Department of Watershed Management Engineering, Faculty of Natural Resources, Yazd University, Yazd, Iran


Nowadays, drought is known as one of the environmental phenomena that has important impact on water quality. The aim of this study was to obtain a relationship between drought and water quality in Zayande-Roud watershed. With respect to the impact of droughton water qualityand also determining the type of water and its relationship with environmental factors, in this study, chemical characteristics of water were investigated using AqQasoftware. Then, chemical type of water resources and its relationship between drought and water quality was determined. The study area was Zayande-Roud River that has five hydrometric stations with 34 years common data. Two stations were located before dam and three stations after dam. In this period, using drought indices (SPI and RDI), dry and wet years were separated from each other, then maximum common dry and wet years were determined in five stations. Then, water quality data were compared in dry and wet years. Based on the results obtained, with the occurrence of drought, the concentration of ions in water has increased and in wet years the concentration of ions in water has improved. As example in Eskandari station, magnesium ion has increased by about 37% in dry years and the rate of sulfate ion in Pol-e-Zaman Khan station has increased by 56% in dry years. Water type in each station was sodium bicarbonate that can be related to geological factors.


Main Subjects

Alizadeh A. (2004). Principles of Applied Hydrology; Mashhad, Imam Reza University Ghanadi M. (2001). Worldview of water crisis. J. Water Environ., 45, 4-14. [In Persian].
Grom G. and Theodor J. G. (2003). (Translated by Bahrami B). Future situation on the beginning of the third millennium. Khzra publication. TehranIran. 
Helfrid M. A, Peter A. Esi., Alan M. and Andrea I. (2010). Chemical drinking water quality in Ghana: water costs and scope foradvanced treatment. Sci. Total Environ., 408, 2378-2386
Malakootian M., Ahmadian M., Ahrampoush M. and Heydarian A. (2011). Investigation of water quality index based on NSFWQI index in Bardsir city. 14th National Conference on Environmental Health, Yazd [In Persian].
Moradi Nezhad A. and Agha Razi H. (2002). Evaluation of drought in Markazi Province by analysis of rainfall data. J. Water Wastewater. 44, 20-25 [In Persian].
Sadeghi H. and Rouhollahi S. (2007). Measurent of the physical and chemical indices of drinkable water in Ardabil city. J. Ardabil Uni. Med. Sci., 7(1), 52- 56 [In Persian].
Setare P., Zinatizade A., Hassani H. and Sharifpour M. (2011). Chemical analysis of groundwater quality using Aq.QA software (case study: villages of Kermanshah province), 14th National Conference on Environmental Health, Yazd [In Persian].
Shariat Panahi M. (1998). The bases of quality and filtering of water and wastewater. Tehran University publication. Fifth print. 
Sharma T. C. (2000). Drought parameters in relation to truncation levels. Hydro1. Process, 14, 1279-1788. 
Sprague L. A. (2005). Drought effects on water quality in the south plant river basin, Colorado. J. Am. Water Resour. Assoc., 41(1), 11-24.
Travis S. E., Marthe B. N. A., Noël J. D. and Bronwyn M G. (2009). Extensive drought negates human influence on nutrients and water quality in estuaries. Sci. Total Environ., 407, 3033–3043.
Tsakiris G. and Vangelis H. (2005). Establishing a drought index incorporating evopotranspiration. Europen Water, 9-10, 3-11.
Van Vliet M. T. H. and Zwolsman J. J. G. (2008). Impact of summer droughts on the water quality of the Meuse river. J. Hydrol., 353, 1– 17.
Yamani, S. (2007). Groundwater quality suitable zones identification application of GIS Chittoor area Pradesh. India Environ. Geol., 53(1), 201-210.
Yaoming Su., Lin Zhu., Huili Gong. and Wenji Zhao. (2006). Utilizating GIS to study groundwater quality evaluation and its distribution in northern ordos cretaceous artisan basin, China. College of Resource Environment and Tourism, Capital Normal University. Beijing100037, China.
Zahedi Klaki E. (2004). Study of the effects of drought on quantity and quality of water resources in Behshahr city. Master's Dissertation of Climatology, Faculty of Earth Sciences, Shahid Beheshti University [In Persian].