Behzad Jamshidi; Yaser Tahmasebi Birgani; Mohammad Jafarpour; NadAli Alavi Bakhtiarvand; Ali Akbar Babaei; Ali Haghighi; Gholamreza Goudarzi
Abstract
Background and purpose: Increasing population and urbanization density and as a result increasing impermeable levels, led to an increase in the volume of urban runoff. Applying simulation models is a suitable way to know the amount of runoff quality parameters. This study aims at evaluating the quality ...
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Background and purpose: Increasing population and urbanization density and as a result increasing impermeable levels, led to an increase in the volume of urban runoff. Applying simulation models is a suitable way to know the amount of runoff quality parameters. This study aims at evaluating the quality of urban runoff in Shushtar city using storm water management model (SWMM). Materials and Methods: Two given rainfall events in 1395 for calibration and validation of the model were considered. The parameters related to the first rainfall event were measured at the outlet of the urban drainage system. Quantitative and qualitative calibration of the model was performed using the first rainfall and model validation was performed using the second rainfall. Results: In the hydraulic calibration, mean values of impermeability, slope, catchment width and manning coefficient were estimated to be 50%, 75%, 25 m and 0.013, respectively. In the qualitative calibration, the coefficients of the Build-up equations for TSS, COD and Zn were equal to 95-25, 48-1, 1- 0.09, respectively. The coefficients of Wash-off equations for TSS, COD and Zn were estimated 0.21- 0.8, 0.2-0.8 and 0.19-0.78, respectively. Conclusion: The results showed that the accurate calibration of the model enhances the ability of the model to estimate the quantitative and qualitative parameters in future rainfall events for the study area. According to the results, the modeling is a powerful tool that can be very useful to improve runoff management.
Fahimeh Khadempour; Ali Shahidi
Abstract
Introduction: Qualitative assessment of water resources using qualitative indicators as one of the most suitable methods for managing water areas and having a regular program for water quality protection and pollution prevention is necessary. Subject & method: The use of the CWQI index to identify ...
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Introduction: Qualitative assessment of water resources using qualitative indicators as one of the most suitable methods for managing water areas and having a regular program for water quality protection and pollution prevention is necessary. Subject & method: The use of the CWQI index to identify the country's water resources (especially lakes and rivers) can be a good tool. In this study, water quality was evaluated in two ophthalmic stations of Oliyakhonic and Farokhi in the Gain river basin of southern Khorasan province during the years of 2007-2016 with the use of this indicator and Aquachem software. In this study, parameters of calcium, magnesium, potassium, sodium, chloride, sulfate, electrical conductivity and acidity were used. Results: The CWQI index for agricultural consumption has been decreasing from the upstream downstream, which may be due to increased water salinity in the downstream direction or the flow of agricultural, industrial and urban wastewater (household and industrial waste). The level of pollution and the concentration of undesirable factors rises from the upstream and downstream, and undesirable water quality for fish life, so that most stations require purification for aquaculture. Conclusion: Both stations are in bad rank for drinking, aquatic, irrigation and livestock. Also, for both recreation both stations were in high rank. Also, according to the Piper diagram, the type and the water facies are bicarbonate-magnesium-calcium.