Idrologia sotterranea e di superficie dei Monti Carseolani (Italia centrale)"

Preliminary results of hydrogeological investigations carried out in the Carseolani Mountains Central Italy) are given. Tha Carseolani Area is represented by a long and narrow karstic range (Km2 29) of Upper Cretaceous-Lower Miocene age bordered by impervious sinorogenetic deposits (sandstones and marls) of Upper Miocene. No springs occour along the bovudary of the limestone range despite two maior karstic network entirely cross the unit wich is faulted and highly fractured by two different tectonic compressional and tensional phases respectively. The main karstic conduits are explorable foe hundreds of metres each identified by inlet and otlet located to the opposite site of the range following the unit minor axis direction. Such under-gound network, channel the runoff generated in the impervious basins bordering the noth-east side of the karstic range, although part of allogenic water progresseveley infiltrates through fractures systems. Moreover a stream network whilch originate from impervious deposits cross the northern part of the karstic range. Although the total surface discharge is limited during periods of low precipitations it has been ascertained that infiltration occours where the treams affect the limestones. The mean annual recharge of the karstic area due to allogenic water and to direct infiltration has been avalueted to 1743 mm (50,55 x 106 m3/a) and it represents the contribution to the regional aquifer of the western Marsica whose main base level is located at Posta Fibreno Springs (9 m3/s).