ABSTRACT
Groundwater discharge occurred at several places in the mountains at different elevations. From three centuries ago, important springs located in the margin of the lacustrine plane were used for the city municipal drinking water supply. Major springs also occur on the south side of sierras Chichinautzin and Las Cruces. These major springs, on opposite flanks of the mountain ranges, were assumed to be the intersection of the regional water-table with the ground surface, and the consequence of the interaction of all matrix factors such as hydraulic conductivity, distribution of hydrostratigraphic units and boundary conditions, and the main input function of groundwater recharge. Springs located in the foothills of Sierra Las Cruces caused flooding before the 1920’s. Springs are not flowing at present near the lacustrine margin; they progressively disappear as a consequence of extensive groundwater extraction from the aquifer units beneath.
