Seite - 610 - in Book of Full Papers - Symposium Hydro Engineering

The dam has been built in the period 1955 – 57 on behalf of SADE (Società Adriatica di elettricità) and transferred to ENEL (Ente Nazionale per l’Energia Elettrica) on March 1963. In the following picture we can appreciate the dam shape during con- struction. Fig. 3 Ambiesta dam (during construction) Ambiesta barrage (pendant la construction) 2.1.1. Area to be dredged A2A, the Public Company, responsible for management of Ambiesta reservoir, during the last years has monitored the sedimentation in the res- ervoir and more in detail sedimentation rate close to the dam structure, through a comparison of several topographic campaigns, to understand the evolution sedimentation phenomenon, and its impact to ancillary structures of the dam (dam bottom outlet and water intake), in terms of efficiency and safety. On basis of this monitoring, A2A noticed that the quantity of sediments, coming from the rain activity on the surfaces of the catchment basin, reached 610