ResumenActualmente, llevar a cabo acciones que reduzcan el impacto ambiental en todo tipo de procesos, tanto industriales, como comerciales o de la vida cotidiana, son preocupaciones pertinentes [1]being them social, scientific, cultural, economical or political. Environmental sensing and monitoring initiatives will be gratified by new Information System (IS. Con la llegada del big data, los grandes volúmenes de datos con una relación armónica de "gente -tierra -tiempo" entró gradualmente en el campo de la gestión de recursos naturales [2]. A diferencia de la cantidad de agua, dato que se puede expresar en términos precisos, la calidad es un atributo de múltiples parámetros. Este proceso arroja un volumen considerable de datos, que finalmente se almacenan en las tablas de datos, pero que no se traducen en información inteligible que describa el estado de la masa de agua. Los índices de calidad del agua -ICA-se convierten en una herramienta de fácil comunicación de la información científica de expertos al público en general [3]. Las anteriores razones motivan la exploración de las diferentes herramientas de minería de datos que día tras día hacen presencia en el mundo. Se logró acceder a los monitoreos realizados a la cuenca del río Bogotá durante el periodo comprendido entre 2007 -2015. Con esta información se realizó el cálculo de los Indicadores de Calidad del Agua para cada una de las estaciones monitoreadas y cada uno de los diferentes periodos estudiados, logrando, así, analizar y evaluar el espacio temporal de la calidad del río Bogotá.Palabras clave: calidad del agua, índice de calidad del agua, ICA, big data, minería de datos.

Currently, one of the main environmental problems that need to be addressed is the pollution inflicted upon different ecosystems by anthropic activities. One example of this problem can be seen in the Bogotá River, a major river in the Cundinamarca department of Columbia and the main water source supplying the Bogotá savannah, which reaches the Colombian capital city. The Bogotá River is highly affected by effluents and wastewater of domestic and industrial origin, among others. These pollutants are generated and accumulated throughout the entire basin, without ever receiving any type of treatment. The pollution levels to which the Bogotá River is subjected can be determined with the calculation of environmental indices, including microbiological contamination indicators such as total coliforms (TC) and fecal coliforms, which include Escherichia coli, Enterobacter, Klebsiella, Serratia, Edwardsiella, and Citrobacter bacteria, living as independent saprophytes. This paper assesses the quality of the water in the Bogotá River, using microbiological indicators and data provided by the Regional Autonomous Corporation (CAR) of Cundinamarca to assess water samples, extracted based on the climatic bimodality exhibited in the basin in dry and wet seasons. The scope of this study was limited to the 35 monitoring Regional Autonomous Corporation of Cundinamarca (CAR) stations located throughout the middle basin. For these purposes, a multitemporal analysis of the TC and Escherichia coli variables was conducted for the 2007–2019 period, which evidenced the contamination levels in this section of the water body. In broad terms, the current state of the middle section of the Bogotá River basin is unacceptable, due to the different activities occurring within its riparian buffer zone, such as uncontrolled domestic, industrial, and/or commercial wastewater discharges. To optimize water treatability, the continuous improvement of existing treatment plants is expected, as well as the implementation of new sustainable treatment alternatives aimed at improving water quality.

The Little Manatee River, a coastal stream that flows into Tampa Bay, may be used as a source of freshwater. Fifty percent reduction of streamflow will result in upstream movement of saltwater. Data on streamflow, tide stage, and specific conductance describe the salinity distribution of the Little Manatee River estuary. Vertical conductivity profiles indicate that the river is vertically homogeneous during low flows. The maximum upstream location of the saltwater-freshwater interface in the river was described by multiple regression analysis using mean daily streamflow and high-high tide data. The coefficient of determination is 0.94 with a root mean square error of +0.4 mile. The analysis for the river ranged from mean daily discharges of 42 to 118 cubic feet per second, high-high tides of 0.81 to 2.48 feet above sea level, and a location of the observed saltwater-freshwater interface of from 5.8 to 10.4 miles above the reference station at Shell Point. The location of the river where the estuarine system ends and the riverine system begins is about 9.9 miles above the reference station at Shell Point. The 800-micromho conductivity line (260 milligrams per liter chloride) demarcates the estuarine and riverine systems. A duration analysis of conductivity indicates that the saltwater-freshwater interface exceeded the 24th Street site, 9.7 miles above the reference station, about 17 percent of the days for the period of study A duration analysis of the computed location of the interface indicates that the location will exceed 9.7 miles about 12 percent of the days. Reduction of streamflow for the 90-day, 2-year recurrence-interval low flow (30.7 cubic feet per second) by 50 percent would cause the maximum intrusion of the interface to move upstream from mile 10.4 to mile 11.1 for a mean high-high tide of 1.65 feet above sea level. Fifty percent reduction of the 90-day, 20-year recurrence-interval low flow (9.37 cubic feet per second) would move the saltwater-freshwater interface 0.2 mile upstream, or from river mile 11.4 to mile 11.6 for a high-high tide of 1.65 feet.

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