The central mass of the dam of Castanhão, which as its axis on the Jaguaribe River, biggest river of the State of Ceará, was developed in CCR (Compacted Concrete with Roll), in the municipality of Jaguaribara. The Castanhão Dam is the biggest reservoir of water for human consumption and animals mainly in the Northeast of Brazil.
The DNOCS (National Department of Construction Works against the Drought), of the Federal Government of Brazil, hired in 1987 the Castanhão Dam Project to the consortium of companies HIDROSERVICE – A. NORONHA, whom designed a Dam of homogeneous soil material with of about 7×106m3 of of volume. In 1995, the engineering works started with the projected end at December of 1999. However, the appearance of aspects not predicted in the foundation delayed the construction works, compromising severely the time frame conclusion. Therefore, the SRH (Hydric Resources Secretary) of Ceará State, with the need of meeting the water demand of the Metropolitan Region of Fortaleza, studied alternatives to anticipate the filling of the reservoir, resulting in the hiring of TPF ENGENHARIA (formerly ENGESOFT) to develop the central mass structure of the projected dam in CCR, in May of 1999. In consortium with the American company MONTGOMERY WATSON, and with the support of international and national consultants, and also utilizing the lab technology of Furnas/GO, TPF ENGENHARIA developed the conception and construction project of the concrete dam, with the closure schedule of the river to January of 2001. The central mass structure of the Castanhão Dam has a volume of CCR of 1×106m3 and 1,2×106m3 de mass earth metal.