Infiltration galleries, ancient constructions and geology integrated in the landsscape of Nemi Maar (Alban Hills, Roma, Italy)

In the basin of Nemi Maar some aspects of the engineering of the territory that represent a landscape value can be identified. These aspects are represented by hydraulic structures for collection and distribution of water which are part of the physical structure of the study area. It is also well known that other sources of water were very abundant until the second half of the twentieth century. Waters are collected in filtering galleries, fountains and springs located in many parts of the territory. This investigation concerns the study of the system of underground drainage channels. This capillary system rediscovered, completed and maintained over the centuries (the oldest tunnels are dated back to the fifth century A.C.), has been preserved until today, demonstrating its ingenious functionality. The final aim of the study has been the realization of a Geographic Informative System (GIS), where all the hydraulic, geological and archeological data are in relation between them. The informative system is open and can be questioned on several levels of knowledge by providing cognitive data.