DAMS OF FORQUILHA IV AND V

Conceptual and Final Designs of the IV and V Forquilha Dams, located in Mine-Factory, owned by VALE, initiated by exhaustive alternatives studies aiming at the maximum reservoir capacity of the tailings in the drainage micro-basins, considering that the disposition of waste from 2007 is 6 million m³. The two dams have very similar characteristics with crest length and height of the order, respectively, of 950 m and 140 m and total reservoir volume of approximately 80 million m³. The surface drainage systems consist of rectangular channels along the slopes of downstream slopes and trapezoidal channels at the junction of the skirts of the dams with their respective shoulders. The operational spillways are of the flute type and those of abandonment with free threshold of the Creager type.