Temporal and spatial diagnosis of surface water quality in an urban watershed
DOI:
https://doi.org/10.6008/CBPC2179-6858.2018.008.0006Keywords:
Water Resources Management, Land Use and Occupation, IQA, Pearson correlationAbstract
Urban development and disorderly land use change both the quantity and quality of water resources in a watershed. In this context, the objective of this study is to characterize the seasonal and spatial variation of the surface water quality of the Fortaleza Stream, located in Cuiabá (MT). Monitoring was carried out at three collection points: East, Middle and Exutory. The collections were performed monthly, between june/2017 and march/2018, during the dry and rain periods. The results obtained over time are presented for the following physical, chemical and microbiological parameters: Temperature, Total Dissolved Solids (STD), Electrical Conductivity (EC), pH, Dissolved Oxygen (OD), True Color, Turbidity, Total Solids, Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), Alkalinity, Nitrite, Nitrate, Total Nitrogen, Total Phosphorus, Total Coliforms (CT) and Escherichia coli. Data were treated statistically, descriptively with the aid of data analysis software 'R' and the application of Pearson correlation. To classify the water quality in the analyzed points, the Water Quality Index (IQA-CETESB) was calculated. The results demonstrated the influence of seasonality mainly on True Color, BOD5, Total Nitrogen, Total Phosphorus, and Escherichia coli parameters. The strong correlations between STDxCE and CTxE. coli ratifies the changes in water quality resulting from anthropogenic activities in the watershed. Finally, the IQA-CETESB classified the quality of the Rising point as 'reasonable' and the Middle and Exutory points as 'bad', pointing out that the surface water of Fortaleza Stream is seriously altered mainly due to the use and occupation process. inadequate soil.
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