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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 11, No. 2, 2014, pp. 293-302
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Bioline Code: st14030
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 11, No. 2, 2014, pp. 293-302
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Groundwater quality degradation of urban areas (case study: Tehran city, Iran)
Nasrabadi, T. & Maedeh, P. Abbasi
Abstract
Groundwater quality of Tehran city is considered
in this study. Nine sampling stations were selected,
and composite sampling campaign was performed in
summer 2012. Groundwater sampled from northern stations
appeared to have acceptable characteristics for agricultural
and drinking uses. The southern station samples
did not meet the required guidelines. Concentration of
SO42-, Na+ and Cl- obey a sharp ascending trend southwards.
Accordingly, the electrical conductivity of the last
station at the very southern areas is more than fifteen times
greater than that of the first northern station. Tehran city is
located in a semi-arid climate and experiences long hot
summers. High rates of evapo-transpiration within urban
green spaces and agricultural lands facilitate the salinization
phenomenon in root zones. As a result, excess irrigation
water eases the consequent percolation into aquifers.
Furthermore, saline water intrusion from salt marshes
located down south of the city is an expected consequence
of wells overpumping. Such case is especially remarkable
in hot seasons when an increased urban water demand is
observed. Remarkable sulfate concentrations in saline
water are mainly justified by percolation of sulfate containing
fertilizers which are broadly used by local farmers
in an uncontrolled manner. Surface run-offs and municipal
wastewater leakage may also trigger the salinization
process.
Keywords
Intrusion; Irrigation; Salinity; Tehran city; Urban groundwater
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