MODELLING OF SEWAGE QUALITY DURING RAINY SEASONA.O. HUSSEIN, S. SHAHID, K.N. BASIM AND S. CHELLIAPANAbstract In the previous four decades, methodical research has been concentrated on the protection of water resources, and especially on the contaminating consequence of the inner city of natural water bodies. One approximation to this investigation has concerned the advancement of instruments to illustrate the phenomena which takes place in the city watershed throughout both wet and dry times. This article aims to determine the significant differences of the changes of Biochemical Oxygen Demand (BOD), and total suspended solids (TSS) parameters in a wastewater in the sewer networks during rainy seasons for the historic rainfall time series using SWMM5. For this purpose, thirty years (1980-2010) of rainfall, temperature and sewer flow data of Karbala city of Iraq were collected, processed and employed for the modelling of the pollution loading. The effects of land-use, population and impervious surface cover on the quality of storm water were also analyzed. The results showed that the concentrations of BOD5 and TSS increase significantly after raining in the study area. The statistical tests showed the differences were significant (p<0.05). The increase of the BOD5 was very high compared to TSS. It can be expected that the long-term simulations of storm water pollution loading would be help to compare the benefits of different scenarios of the sewagetreatment plan for the reduction of the pollution in the storm discharge.
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