Evaluation of pollution reduction scenarios in a river basin: application of long term water quality simulations

1997 ◽  
Vol 35 (9) ◽  
pp. 65-75 ◽  
Author(s):  
C. Demuynck ◽  
W. Bauwens ◽  
N. De Pauw ◽  
I. Dobbelaere ◽  
E. Poelman
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
River Basin ◽  
Pollution Abatement ◽  
Dynamic Modelling ◽  
Surface Water Quality ◽  
River Basin Management ◽  
Ecological Condition ◽  
Abatement Strategies ◽  
The Impact

Because of stricter environmental regulations for surface water quality in Flanders, large efforts are made for the construction of sewers and water treatment plants. The present methodology to determine the necessary pollutant load reductions is based on the combination of simple mass balances, the 90-percentile discharge and neglects the self-purification capacity of the surface water. This method is very easy to apply but offers little guarantee that the goals set will be met. A sustainable river basin management requires a methodology to evaluate different options in pollution abatement strategies. Only by this, the available resources can be applied in the most advantageous, sustainable way. In this paper, a methodology is proposed to evaluate water quality based on dynamic modelling. This methodology is illustrated by means of a case study on the river Dender. Continuous and simultaneous measurements uin 3 places along the river were used to calibrate and validate the model. Continuous simulations over a period of four years guarantee that, in contrast with traditional event type simulations, most discharge and hydrometeorologic conditions are taken into account. Attention was given to the occurrence of extreme events. These events will determine the global ecological condition of the river. CDF-curves (Concentrated-Duration-Frequency) make it possible to gain insight in the duration and the frequency of occurrence of events with inadmissible concentrations of dissolved oxygen and ammonia. Besides simulations taking into account the present loads, different pollutant abatement strategies were analysed and compared. The applied methodology offers the possibility to evaluate the impact of different strategies and to locate present and future problems.

scholarly journals Spatial-temporal analysis of the surface water quality of the Pará River Basin through statistical techniques

2019 ◽  
Vol 14 (1) ◽  
pp. 1
Author(s):  
Josiani Cordova de Oliveira ◽  
Kelly Prado Maia ◽  
Nara Linhares Borges de Castro ◽  
Sílvia Maria Alves Corrêa Oliveira
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
River Basin ◽  
Statistical Tests ◽  
Surface Water Quality ◽  
Minas Gerais ◽  
State Legislation ◽  
Historical Series ◽  
The Impact

Water quality issues are a growing concern due to the the recent intensification of urbanization and industrialization. This paper evaluates and compares the surface water quality of the ten sub-basins of the Pará River, located in the São Francisco River Basin, Minas Gerais, and evaluates the impact of seasonality and the compliance with the current limits of state legislation. The surface water quality monitoring database of the Institute of Water Management of Minas Gerais (Igam) was used, and 18 parameters were analyzed from a historical series from 2008 to 2016, totaling 16,651 observations. First, the descriptive statistics of the parameters were calculated, considering each sub-basin separately. Then, for the temporal and spatial analysis, the Kruskal-Wallis nonparametric statistical tests were applied, followed by the multiple comparison test, with an alpha level of 5%, due to the asymmetric behavior of the data. Thus, it was possible to compare water quality of the sub-basins in rainy and dry seasons and to identify which parameters were responsible for the greater degradation. In the compliance analysis to the current limits of state legislation, it was identified that all of the sub-basins were out of the specified range for at least one of the evaluated parameters. Finally, the seasonality analysis exposed significant differences in the parameters of dissolved oxygen, turbidity, total suspended solids, total solids and water temperature, where it was shown that there was a worsening of water quality in the rainy season for most sub-basins.

scholarly journals Impact of Controlled Drainage and Subirrigation on Water Quality in the Red River Valley

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 308
Author(s):  
Kristen Almen ◽  
Xinhua Jia ◽  
Thomas DeSutter ◽  
Thomas Scherer ◽  
Minglian Lin
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Surface Water Quality ◽  
Drainage Water ◽  
River Valley ◽  
Red River ◽  
Nutrient Loss ◽  
Controlled Drainage ◽  
Red River Valley ◽  
The Impact

The potential impact of controlled drainage (CD), which limits drainage outflow, and subirrigation (SI), which provides supplemental water through drain tile, on surface water quality are not well known in the Red River Valley (RRV). In this study, water samples were collected and analyzed for chemical concentrations from a tile-drained field that also has controlled drainage and subirrigation modes in the RRV of southeastern North Dakota from 2012–2018. A decreasing trend in overall nutrient load loss was observed because of reduced drainage outflow, though some chemical concentrations were found to be above the recommended surface water quality standards in this region. For example, sulfate was recommended to be below 750 mg/L but was reported at a mean value of 1971 mg/L during spring free drainage. The chemical composition of the subirrigation water was shown to have an impact on drainage water and the soil, specifically on salinity-related parameters, and the impact varied between years. This variation largely depended on the amount of subirrigation applied, soil moisture, and soil properties. Overall, the results of this study show the benefits of controlled drainage on nutrient loss reduction from agricultural fields.

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