Seite - 623 - in Book of Full Papers - Symposium Hydro Engineering

In Fig. 17 we can have a clear picture of the monitoring of the concen- tration of the sediments in the slurry pumped from the reservoir downstream the dam, till to the confluence between Ambiesta stream and Tagliamento river. Fig. 17 Slurry concentration monitoring system Système de monitoring de la concentration du slurry According to Client’s requirements, concentration of the sediments in the slurry has been continuously monitored, giving to the Client and to the Contractor itself, every day, maximum/minimum and average concentration values, through which a simple calculation gave a confirmation of the sedi- ments removed from the bottom of the reservoir calculated using different topographic surveys. 3.3. Productivity rates Taking into consideration dredging technology, time needed for regular maintenance of the equipment, out of service of some part of the equip- ment, not constant characteristics of the sediment to be dredged, vari- able water depth, variable thickness of sediments to be dredged, the dredging productivity, evaluated on daily basis has been the following:  minimum productivity: 200 m3/day 623