Determining The Critical Degree of Reservoir Lifetime for The Saguling Reservoir Based on The Sediment Inflow Simulation

• Published in: Jurnal Teknik Sipil Vol. 17; no. 1; pp. 47 - 62
• Main Authors: Bakhtiar, Joetata Hadihardaja, Iwan K. Hadihardaja
• Format: Journal Article
• Language: English
• Published: Institut Teknologi Bandung 01-04-2010
• Subjects: annual inflow; reservoir capacity; reservoir lifetime; trap efficiency
• ISSN: 0853-2982; 2549-2659
• DOI: 10.5614/jts.2010.17.1.5

This study aims to find out the relationship between the critical degree of reservoir lifetime and sediment inflow. The critical degree of reservoir lifetime is defined as the ratio between the designated lifetime of the reservoir and its effective lifetime. The effective lifetime of a reservoir is affected by the amount of sediment flowing into the reservoir and trap efficiency. Soil and Water Assessment Tool (SWAT) version 2005 model was incorporated into this study to simulate hydrological processes taking place in the catchment. The reliability of of SWAT model depends greatly on the data availability and some parameter adjustments. From the calibration and validation results on monthly data, the model is considerably of good performance. The modeling results revealed that the mean sediment yield is 235.86 ton/ha/year, and the mean sediment inflow into the reservoir is 5,102,000 tons per year which is equivalent to 3,836,090 m3 per year resulting in 43.66 years of the reservoir lifetime (21.66 years remaining) which corresponds to the critical degree of 2.29 The graph plotting the values of the sediment inflow and the critical degree of reservoir lifetime reveals a linear relationship.