In the Alamillo area one can visit a Roman reservoir for water distribution, already in use in the 1st century, as well as its corresponding entrance and exit aqueducts. The water came from a spring, today dried up, which was located 5kms from the reservoir in the neighbouring area.
The reservoir is rectangular, 15.3m x 12.3m in size, and 1.35m deep, meaning it could hold a large volume of water. The walls were built from stone and lime, two of them against the earth and the two other reinforced by buttresses In its interior the reservoir is plastered with red hydraulic opus signinum mortar. In the interior corners and the joints of the walls with the floor there are remains of the cane reinforcements to make the structure airtight a habitual technique in Roman compartments for liquids, which we can also appreciated in the salting basins or tanks. Next to one of the walls one sees the remains of a drainage system and the base of an access staircase for cleaning.