Agrochemical Modeling In Rivers:
The Sampaio Irrigation Project Case Study
Author(s)
G. C. Nascimento & A. M. Pereira Andreazza
Abstract
This study evaluates the agrochemical impact present in irrigation effluents of
the surrounding hydric environment. The case studied refers to the Sampaio
Irrigation Project, located at the far north of Tocantins State, on the left margin
of the Tocantins River, in which case this river is the receiving body of polder
drainage intended for a rice culture using flood irrigation. By using mathematical
modeling, three distinct hydrological scenarios were simulated, aiming to
identify concentrations of the chemical compounds used in the Tocantins River,
and the range of the impacted area, adopted as the area under direct influence of
this impact. We concluded that only the compound Carbaryl had higher
concentrations than the limitations allowed for the Tocantins River by
CONAMA [National Environmental Council] Resolution No. 357/2005 for class
1 and class 2 rivers, and that the extension of the area affected by such
concentrations is of about 6 km [3.73 miles]. Having obtained these results from
our model, specific measures were recommended to prevent the identified
impact, and added to the Environmental Impact Study and Environmental Impact
Report (EIA/RIMA) for the project.
Keywords: environmental impact, agrochemical composts, toxic substances
modeling in water.
1 Introduction
The drainage of agricultural areas often introduces strong environmental impacts
in surrounding areas as it carries part of the agrochemical substances applied to
crops to natural water resources. These impacts are an object of concern all over
Keywords
environmental impact, agrochemical composts, toxic substancesmodeling in water.
Related Book
Other papers in this volume
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