Page - 305 - in Book of Full Papers - Symposium Hydro Engineering

0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 1000 10 20 30 40 50 70 60 80 90 100 g a b c fe d h i j k l Silt % Group Type A [C] Clay B [SaC] Sandy Clay C [SiC] Silty Clay D [SaCL] Sandy Clay Loam E [CL] Clay Loam F [SiCL] Silty Clay Loam G [Sa] Sand H [LSa] Loamy Sand I [SaL] Sandy Loam J [L] Loam K [SiL] Silt Loam L [Si] Silt Information Grain size accumulation curve Na 200 7 10 25 42 2000 476084 Na 40 Na 10(Na) (µ) 0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 1000 10 20 30 40 50 70 60 80 90 100 g a b c fe d h i j k l Silt % 2. METHODOLOGY Discussion in this paper generally consists of two subjects. The first part discusses the problem of sedimentation in Sengguruh reservoir. The study on sedimentation in Sengguruh reservoir is done by studying the secondary data available, the results of previous studies, collecting and analysis of primary data in the field. The second section discusses the work of sediment dredging in Sengguruh reservoir by explain the current method and development planning to get the best method to doing the dredging operation, there are (a) with the combination of 2 (two) dredging types using available dredgers and additional heavy equipment (amphibious excavators) to take out sediment bank which has become solid and 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 to increase the range of dredger, and (d) management of spoilbank by re-arrange of hauling and reloading cycles, accelerate sediment material drying by installing vertical-horizontal drainage and increase spoilbank capacity. The second discussion includes planning and application method of the dredging work through field studies conducted in Sengguruh reservoir which is conducted at this time. 3. RESULT ANALYSIS AND DISCUSSION 3.1. SEDIMENTATION OF SENGGURUH RESERVOIR From the results of sediment testing on the soil laboratory in Perum Jasa Tirta 1 there are 6 types of sediment in Sengguruh Reservoir namely loam, silt, silt loam, sand, sandy loam, and loamy sand. Sediment of silt loam type is the most sediment type found in Sengguruh Reservoir Figure 2. Soil classification of grain size (Sample of passed 2000 sieve) Classification du sol de la taille des grains (échantillon du tamis 2000 passé) 305