IMPORTANCIA DEL FUNCIONAMIENTO DEL AGUA SUBTERÁNAEA EN LA DEFINCIÓN DE IMPACTO AMBIENTAL, XOCHIMILCO, MÉXICO. JJ. CARRILLO-RIVERA M. PEREVOCHTCHIKOVA Instituto de Geografía, UNAM, Coyoacán 04510, DF, México G. ÁNGELES-SERRANO Centro de Investigaciones Sobre América del Norte, UNAM, Coyoacán 04510, DF, México email@example.com ABSTRACT This study proposes the original hydrogeological functioning of the Chinampa at the Xochimilco area located to the Southeastern of the basin of Mexico, this is presented using the groundwater flow systems theory to sustain how the impacts caused by groundwater extraction are controlled and manifested as visible effect in the surrounding environment. Other non-visible impact as water quality change is also presented. The ancient traditional chinampas (piece of land gained to the former shallow lake by filling in a bounding square net formed by the roots of phreatofites trees called Ahuejotes, Salix bompladiana) are of cultural and ecological interest so the study area has been considered by the city authorities as a Natural Protected Area (PNA), this was further acknowledged by UNECO. The lake has progressively deteriorated by the extraction of the groundwater that virtually intercepted all of the flow to the former lake, water that was replenished by secondary treated water placing a quality concern on top of the one of quantity. However, it has been argued by the local water authorities that the lake still covers its hydrological functions including the attenuation of contaminants. Here, another concern is present as the reduction in natural groundwater discharge is making land to be available for settlements placing a further strong pressure of urbanization that would have to cope with all related water supply issues.
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