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The floodgate separates the water level downriver, which varies with the tides, the periods of rain and the ebb tide, from the water level upriver, in the marina, which has a constant depth and is not subject to tides.

The El Cajón Hydroelectric Project, located on the Santiago river, is the largest infrastructure project carried out in Mexico within the last 10 years. It forms part of the Santiago Hydrological System and it is designed for the generation of electrical energy through two 375 MW units. An average total annual generation of 1,228.64 GWh is planned. Among the six power stations built to date, this project holds the second place in terms of power generation.

Located in Baliarrain, it has a length of 232 meters and a height of 63 m above the water bed. It holds 7.53 cubic hectometers and supplies drinking water to the area’s nearly 60,000 inhabitants.

The new treatment plant has replaced the obsolete facility of Gigablok, in operation since 1981. The project entailed the execution of more than 40 buildings and structures of various functions and dimensions. The key to the construction work was to supply the corresponding material on time, to perform works simultaneously, and to layout the various systems precisely. All this required the most experienced engineers in working with complicated structures.