Pollution and sediment threaten to dry Lake Chapala

September 24, 2019.

Pollution and azolve “SEDIMENT DEPOSITS”, product of being the recipient of the residual discharges of human settlements on its riverbank cause pollution of the Lerma River, Lake Chapala or Laguna, which agonizes and in a short time it could become a dried-up zone, with the consequences that a crisis of this type would bring to those who precisely for years generated it: human beings. This is part of the alert voices given by civil organizations, scientists and the general population, who urged the authorities to take action to stop this deterioration.

The lake is a thermoregulator in the western part of the country and a provider of irrigation water in just over 6,000 hectares in the part of Michoacán, in the ejidos of the municipalities of Villamar, Sahuayo, Jiquilpan and Venustiano Carranza; In the case of Jalisco, it is the main water supplier for the metropolitan area of ​​Guadalajara, since it provides 60 percent of the water it consumes.

The lake is part of the Lerma-Chapala basin, consisting of 53 thousand 591 square kilometers and is a recipient of the 194 kilometers of main channel; The National Water Commission has 37 aquifers located in this basin: 16 in Guanajuato, 6 in Jalisco, 9 in Michoacán, 2 in the State of Mexico and 4 in Querétaro from which approximately 5 thousand 200 hectometers are extracted annually through 14 thousand 652 active wells.

According to researchers from the Interdisciplinary Research Center for Regional Integral Development (CIIDIR) of the IPN based in Jiquilpan, Lake Chapala receives mainly two types of pollutants and are identified as pathogenic bacteria, organic matter, fats and water mixtures Residuals and chemical contaminants such as fats, oils, heavy metals, detergents, fertilizers and pesticides.

Lake Chapala is one of the 134 Ramsar sites in the country and one of the nine in Michoacán that, through Semarnat, seeks the appointment of a protected natural area for the former island of Petatán, an appointment that is required to build the sanctuary of the Pelicanos Borregones as a protected natural area and in this way preserve the integrity of this wetland, since the municipality does not manage to cover the care and protection of the place. The Puerto Rican pelicans arrive at the former island of Petatán, in the municipality of Cojumatlán, between April and November.

Ecological organizations and various voices of civil society establish that the loss of volume of the lake is directly associated with the increase of the azolve. According to CIIDIR data, 78 million cubic meters of sediments have entered the lake, this only through the Lerma River, adding to the 100 million tons of azolve denounced by the Heart of the Earth organization, mainly due to deforestation in this region and in the vicinity of tributary rivers of the lake; “The phenomenon reduces storage capacity by 2.5 cubic millimeters and increases the lake bed by 7 cubic millimeters per year, which would eventually lead to this reservoir to total azolve.”

Source: quadratin.com.mx

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