Impact of Drought on Groundwater Quality and Groundwater Level in Qorveh-Chardoli Plain

Document Type: Original Article

Authors

1 Assistant Professor, Department of Soil Science, Urmia University, Iran

2 M.Sc. Alumni, Department of Water Engineering, University of Tabriz, Iran

3 M.Sc. Alumni, Department of Geology, Urmia University, Iran

4 Ph.D. Student, Department of Soil Science, University of Tabriz, Iran

Abstract

Considering the climatic condition of the Iran, drought is an inevitable phenomenon. However, the probability of the drought occurrence would be predicted using the recorded meteorological data. Due to the drought importance, and its impact on groundwater resources, in this study, the influence of drought on groundwater quality and ground water table of Qorveh-Chardoli plain was evaluated during the recent 25 years period. Monthly precipitation data (1987-2013) were applied to calculate the standardized Precipitation Index (SPI) which was used to find the drought and wet years. Groundwater quality was also determined using electrical conductivity and sodium adsorption ratio and considering the Wilcox diagram. Kriging map of the water quality and water table were produced for wet and drought years. Groundwater quality of the Qurveh-Chardoli aquifer were classified as C2S1 and C3S1. There was not a significant change in the water quality even during the wet period with raising water table. Groundwater level has changed 29.35m (increasing) and 13.39m(decreasing) during the drought and wet periods, respectively. The overall rate of the water level decreasing during the study period was 49 cmyear-1. The greatest decrease in water level were observed for eastern and southern parts of the plain.

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