Page - 308 - in Book of Full Papers - Symposium Hydro Engineering

limited operational range (both depth & discharge),and to reduce length of dredging pipelines. Shortly, this condition is not good for keeping high hydropower productivity which affected much of zone 1 condition. Figure 5. General Plan Dredging Work on Current Condition Travaux de dragage du plan général sur l'état actuel 3.3. DEVELOPMENT PLANNING OF DREDGING WORK TO RECOVERY HYDROPOWER PRODUCTIVITY The dredging method in 2016 was changed in order to make the dredging of sediment can be implemented more effectively and efficiently to ensure high hydropower production, maintain effective storage capacity and prolong age of reservoir. The development planning are (a) with the combination of 2 dredging types using available dredgers and additional heavy equipment (amphibious excavators) to take out sediment which located at positions could not be done by dredgers (dry-wet excavation), (b) installation of booster pump and floating pipe as support of the dredgers, (c) modification of dredger ladder, (d) management of spoilbank by re-arrange of hauling and reloading cycles, and accelerate sediment material drying by installing vertical-horizontal drainage. Dredging Zone 500-600 m Spoilbank Area Hydropower Intake 308