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Evaluation of runoff Quality produced by rainfall within city of Mashhad
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Abstract: (9888 Views) |
| Abstract
Rainfall in urban areas washes off all the material accumulated on the impervious pavement surfaces and the resulting polluted runoff negatively changes the quality of the surface waters as well as groundwaters.In this research study, the quality of rainfallin the study area including one rainfall and nine runoff samples were collected from different locations in Mashhad after rain.The EC and pH parameters was determined in situ and the ionic density of Cl, SO4, Na, Mg, Ca, and HCO3 were all measured with an atomic absorption system (AAS) at the Ferdowsi University of Mashhad. The hydrochemical type of most of the runoff samples were determined based on the Piper diagram and it was shown to be calcium sulfate (W3, W4, W5, W6, W8) and calcium bicarbonate (W7, W2, W9). The hydrogeochemical differences between the rainfall and the city runoffs can be due to factors including lithology, urban soils and dusts, and sewage inflow. According to the Scholler diagram, the water quality of the runoff samples varied from good to unsuitable and absolutely unpleasant for drinking. Moreover, all the samples were recognized to be of low salinity to very saline for irrigation use based on Wilcox diagram. |
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| Keywords: Runoff, Mashhad, water pollution, Wilcox, Piper, Schuler |
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Full-Text [PDF 1860 kb]
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Type of Study: Research |
Subject:
Special
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