Groundwater contamination by nitrates in the city of Konya, (Turkey): A GIS perspective

Groundwater is an essential drinking water source in the city of Konya, Turkey. Approximately 75% of the city's water consumption has been supplied from 198 groundwater wells for the last six years. Nitrate ( NO 3 − ) is one of the important water quality parameters and was measured in the wate...

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Bibliographic Details
Published in:Journal of environmental management 2006-04, Vol.79 (1), p.30-37
Main Authors: Nas, Bilgehan, Berktay, Ali
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Cities
Conservation, protection and management of environment and wildlife
Data Collection
drinking water
Environmental Monitoring
Fundamental and applied biological sciences. Psychology
General aspects
Geographic Information Systems
GIS
Groundwater
groundwater contamination
Groundwater pollution
Humans
Maximum Allowable Concentration
Nitrate
Nitrate content
nitrates
Nitrates - analysis
Risk Assessment
Software
spatial distribution
Turkey
Water Pollutants, Chemical - analysis
water quality
water quality analysis
Water Supply - analysis
Water Supply - standards
Water Supply - statistics & numerical data
Wells
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Summary:Groundwater is an essential drinking water source in the city of Konya, Turkey. Approximately 75% of the city's water consumption has been supplied from 198 groundwater wells for the last six years. Nitrate ( NO 3 − ) is one of the important water quality parameters and was measured in the water samples taken from 139 wells in 1998 and from 156 wells in 2001 within the study area of 427.5 km 2. To evaluate the nitrate data, a vector-based GIS software package ArcView GIS 3.2 was used. A hardcopy map of the city was digitized in the UTM projection system. The locations of the wells were obtained by a hand-held Global Positioning System (GPS) receiver. According to the maps produced, nitrate concentrations generally tend to increase in the city center, the average concentrations being 2.2 and 16.1 mg/L for the years of 1998 and 2001, respectively. A statistical correlation procedure was also applied to well depths and nitrate concentrations. As a result, correlation coefficients of 0.259 and 0.261 were obtained for data collected in 1998 and 2001. It is concluded that the distribution of nitrate concentrations is not correlated with well depths within the study area.
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2005.05.010