A royal coat of arms topped the main elevation of the control room of the Reservatório do Monte dos Congregados (Monte dos Congregados Reservoir), built to integrate the first domestic water supply system in the city of Porto. The Compagnie Générale des Eaux pour l'Étranger was the concessionaire responsible for the project, and consisted of the Central de Captação de Água de Foz do Sousa (Foz do Sousa Water Collection Plant), the Jovim tunnel reservoir, the siphon bridge over the Rio Tinto, the reservoirs of Santo Isidro, Monte dos Congregados, and São João da Foz (da Pasteleira), and the Monumental Fountain (Fonte dos Leões). The Monte dos Congregados Reservoir supplied the upper part of the city.
