Identification and evaluation of biological pollution sources of urban runoff

Document Type : Research Paper


1 Department of Civil Engineering, Faculty of Engineering, University of Bojnord, Bojnord, Iran

2 Department of Water Engineering, Faculty of Engineering, Islamic Azad University, North Tehran Branch, Tehran, Iran

3 Department of Geology, Islamic Azad University, North Tehran Branch, Tehran, Iran


This research was conducted with the aim of investigating the effect of urban land use on the amount of biological pollution of urban runoff, the possibility of its reuse, and finding the amount of pollution in the quality of urban runoff in District 6 of Tehran. To carry out this study, first, urban sub-basins with different dominant land uses (residential, green space and office-commercial) in a geographical area with the same temperature change conditions in the 6th district of Tehran were determined and the land use distribution in each sub-basin was analyzed. Then, the sampling points at the exit positions of the runoff caused by the rainfall in the defined sub-basins were identified and the instantaneous sampling of the urban basin exit runoff after the rainfall in the spring season and field and laboratory measurements of the parameters and variables Qualitative (chemical and biological) and quantitative (flow rate and flow depth) were done. The quality relationship of urban runoff was measured based on biological variables in May.Pearson statistical methods and one-way analysis of variance were used to identify the relationship between land use and the results of laboratory measurements. In linear regression methods, total coliform was used as an independent variable to investigate the relationship and interaction with other parameters. The results showed the effect of green, residential, and office land use in increasing the amount of total coliform as an indicator of microbial pollution in urban runoff, respectively. The highest level of coliform in green space land use was 14 MPM, which is due to the use of chemical fertilizers. Also, EC with a value of 889 us, and TDS with a value of 640 mg/l, in green space usage was higher than other land uses, which could be attributed to soil washing by runoff. Based on the analytical results, the effective variables on the number of microbial pollutants were identified, and the relations of estimation and prediction of its amount based on the effective variables were introduced in the form of total coliform estimation equations.


Main Subjects

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