| Popis: |
Urban stormwater runoff is believed as a primary nonpoint source that contributes to pollution to all water resources in the surrounding environment. Pollutant concentrations of urban stormwater runoffs are directly or indirectly linked with land use types in a catchment that is quite different in different places and hence, site-specific studies are necessary. This paper portrays the influence of land use types on stormwater runoff quality in Chattogram city where demarcation of land uses is often complicated. The stormwater runoff samples were collected from four different land use types: residential, commercial, institutional, and industrial, in the city of Chattogram, Bangladesh, during the period from July to September 2020. In addition to basic statistics, principal component analysis (PCA) was performed to identify the influence of urban surface characteristics on the quality of stormwater runoff. Pollutant concentrations were identified by analyzing key water quality physical and chemical parameters including color, temperature, turbidity, TSS, TDS, electrical conductivity, salinity, pH, DO, BOD5, COD, and NH3-N. Results of this study demonstrate a strong correlation between land use types and stormwater runoff quality. When comparing the measured values of water quality parameters with respect to land use types, it was observed that residential land use sites overall provide the higher concentration of pollutants tested within this study. Results also demonstrate that measured characteristics of stormwater runoff of this study are comparable with data reported in similar land use types worldwide. The outcomes of this study would be particularly helpful in calibrating water quality models considering different land use types. Additionally, datasets and information obtained from this research will assist engineers and practitioners in developing decision-making tools for effective stormwater management. |
