Mardwiono, Firmansyah, Sedyowati, Laksni ORCID: https://orcid.org/0000-0001-9170-9864 and Wibisono, Gunawan (2022) Integrated Sediment Management as a Sustainable Effort of Reservoir Function: A Case Study on the Sengguruh and Sutami Reservoirs. International Journal of Innovative Science and Research Technology, 7 (2). pp. 492-500. ISSN 2456-2165

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Abstract

Sengguruh and Sutami Reservoir are facing severe
sedimentation problems, that causes a significant decrease in storage capacity. Sengguruh Reservoir leaves ± 5.85% of the initial capacity, while the Sutami Reservoir only leaves ± 51.94% of the initial capacity which affects the capacity of energy generation, fulfillment of irrigation water, raw water and flood
control. Erosion and sedimentation analysis was carried out
using the USLE method to determine sedimentation potential based on 2019 land use, reservoir storage capacity analysis using bathymetry results to determine sedimentation rates and prediction of reservoir life, and sediment balance analysis to determine appropriate sediment management efforts. Integrated sediment management from upstream to downstream (reservoir) is a solution. Watershed conservation is the most important effort in sediment management, because watershed conservation can reduce sedimentation potential by 3,16%. Management and construction of sediment control structures on the Brantas River and Lesti River as well as construction of retaining structures and waste processing at the
settlement pond location upstream of the Sengguruh Reservoir can reduce reservoir sedimentation by 6.95%. Sediment dredging of 250,000 m3/yr for Sengguruh Reservoir and flushing every 3 (three) years can increase the storage capacity by 9.45%. Meanwhile, in Sutami Reservoir, through dredging efforts of at least 400,000 m3/yr, can maintain the function of the reservoir for the next 135 years.

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