Page - 311 - in Book of Full Papers - Symposium Hydro Engineering

Figure 7. Alternative Scenario of Dredging Work Development Plan in Sengguruh Dam Scénario alternatif du plan de développement du travail de dragage au barrage de Sengguruh C. MODIFICATION OF DREDGER LADDER This is done because the existing dredgers specification is only able to reach the depth of sediment up to + 5 m, whereas we know that the thickness of the sediment from the surface to the base has reached more than 12 m so that to improve yield and productivity we make modification efforts by extending ladder dredgers become 10-12 m. D. MANAGEMENT OF SPOILBANK BY RE-ARRANGE OF HAULING AND RELOADING CYCLES As we already know that the limited availability of land for spoilbank becomes an obstacle in the effort of managing sediment especially to support sediment dredging efforts, because the guarantee of spoilbank availability as a place for the dump material of the dredged sediments greatly influences the volume or the dredging target. The current condition of existing spoilbank capacity is able to accommodate sediment up to +200.000 m3 volume for 1 year period, whereas we have to do annually dredging activities. For that purpose, we made several efforts to maintain the availability of spoilbank by arranging the spoilbank utilization cycle schedule consisting of the hauling schedule (mechanical transfer) and reloading. From the existing spoilbank spoilbank D, D1, and Kemiri we set the maintenance cycle and its use with the aim of all the spoilbank in turn can be used every year. 311