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Article

Spanish

ID: <

oai:doaj.org/article:073ced46bd974db3941e6aa275cacecd

>

·

DOI: <

10.22490/21456453.3136

>

Where these data come from
Vulnerability of surface water sources in the Cerrito river basin to diffuse agricultural pollution

Abstract

Contextualisation: Traditional agricultural activity includes the application of chemicals for plant nutrition, pest control, weeds and diseases. Once applied, these products are transported to water bodies in a diffuse manner. At the same time, surface water sources are exploited for human, agricultural, industrial and recreational consumption, among others; they underpin aquatic ecosystems. Knowledge gap: Parametric methods exist to assess the vulnerability of underground sources, but they are scarce for surface water sources. Purpose of the study: The objective was to apply a methodological proposal to assess the categories of vulnerability of surface water sources from the Rio Cerrito Basin to diffuse pollution from agricultural sources as an instrument to support the planning of prevention, mitigation and recovery actions. Methodology: In this regard, we propose a methodology based on a multicriterium analysis and geographical information systems technique to identify and spatialise the vulnerability of surface water sources from the tax basins to the River Cauca under the jurisdiction of the Department of Valle. This model was applied to the River Cerrito river basin (Colombia), which has a diversity of cover, slopes greater than 12 % in the upper part and technical farming in the lower part. Findings and conclusions: The result was a raster area with values from the Surface Water Sources Vulnerability Index to Difusa Agrochemical Pollution (IVCDA). This assessment indicated that most of the basin (75.3 %) is medium vulnerable and is mainly associated with flat sugar cane crops and pastures on the hillside. Small outbreaks with high vulnerability (0.6 %) were obtained associated with crops such as vegetables, citrus fruits and vines. The wooded and herbaceous areas were identified as being vulnerable to Low to Muy Baja. The spatial distribution of the NDICI led to the conclusion that the main vulnerability factors on the hillside are the slope and erosion and in the flat area inadequate agricultural practices. In terms of cover, it was concluded that the most vulnerable are vines, citrus fruits and vegetables.

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