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All Journal Journal of the Civil Engineering Forum Jurnal Ilmiah Teknik Sipil Open Access DRIVERset
Kurniawan Putra Santoso
Universitas Gadjah Mada
Civil Engineering, Building, Construction & Architecture

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The Development of Ungauged-Catchment Integrated-Similarity Unit Hydrograph to Estimate Inflow of Wonogiri Reservoir Kurniawan Putra Santoso; Istiarto; Rachmad Jayadi
Journal of the Civil Engineering Forum Vol. 9 No. 3 (September 2023)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.7051

Abstract

The Wonogiri Reservoir is a multipurpose reservoir at the Upper Bengawan Solo Watershed, primarily designed to serve as a flood control system. However, there is no accurate estimation of the inflow into the reservoir due to the limited availability of hydrological stations. Observations showed only four out of ten unit hydrographs of the Wonogiri Reservoir watershed. Therefore, this study was conducted to apply an integrated similarity-based approach for designing unit hydrographs in ungauged catchments. The process involved evaluating the integrated similarity between pairs of gauged-ungauged catchments using hydrologic and physical property parameters. This led to the selection of the donor or gauged catchment with the highest similarity score to develop the unit hydrograph for the ungauged catchments. The developed UHs were further applied to estimate the reservoir inflow for the December 25, 2007, flood event. The results showed that the computed peak discharge was 10.9% lower than a previous study. Subsequently, the HEC-HMS simulation model was used to project the updated design flood hydrographs to the reservoir. The design rainfall was derived from automatic rainfall recorder (ARR) and PERSIANN satellite-based data. The ARR data showed that the extreme rainfall duration was 5 hours while satellite data indicated 6 hours. The application of the ARR 5-hour duration to the updated flood hydrographs led to a peak discharge of 5123 m3 s-1, 7041 m3 s-1, and 10,370 m3 s-1 for the 60-year, 500-year, and PMF floods respectively in line with the flood design criteria of Wonogiri Reservoir. These estimates were observed to be significantly higher than the 1982 design floods which were 4000 m3 s-1, 5100 m3 s-1, and 9600 m3 s-1 respectively. This updated flood control design was important to renew the operation rule of the Wonogiri reservoir during flood periods.
EVALUATION OF REAL NEEDS NUMBER FOR OPERATION AND MAINTENANCE OF DAMS IN BALI PROVINCE Fransisca Natania Karina Rediasti; Ida Bagus Gede Indrayana; Kurniawan Putra Santoso
Jurnal Ilmiah Teknik Sipil Vol. 28 No. 2 (2024): Jurnal Ilmiah Teknik Sipil, Vol. 28 No. 2, September 2024
Publisher : Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JITS.2024.v28.i02.p09

Abstract

An increase in population by 1.04% and crop area by 14.08% in Bali Province, will also increase the water needs. Dam as water infrastructure that supports water availability, is needed in overcoming the problem. Dams require operation and maintenance (O&M) to keep function optimally. Operation and maintenance costs need to be evaluated periodically with the real needs of operation and maintenance. Real needs of operation and maintenance suitability can guarantee the optimal functioning of the dam. This study evaluated the suitability of Balinese dam’s operation and maintenance, namely Benel Dam, Telaga Tunjung Dam, Gerokgak Dam, and Palasari Dam. Dam performance appraisals include physical, operational security, and institutional ranging from 0 to 100. The results the grouped into good, enough, less, and bad category. All four dams got “enough”, so their real needs number for operation and maintenance need to be evaluated. The evaluation showed that Gerogkak Dam had the largest real needs number for operation and maintenance value, which is IDR 28,767,099,149. The real needs of operation and maintenance value is consisted of ≥ 90% dredging’s cost. Dredging’s cost us mainly influenced by sediment’s volume. So, to reduce sediment’s volume and improve dam’s performance for irrigation, it is necessary to increase the efficiency of dam’s operation and maintenance. Efficient dam operation also necessary due to the limited operators. Building efficiencies that control sediment and water supply, must be increase aligned with water needs and reservoir conditions.
EVALUATION OF REAL NEEDS NUMBER FOR OPERATION AND MAINTENANCE OF DAMS IN BALI PROVINCE Fransisca Natania Karina Rediasti; Ida Bagus Gede Indrayana; Kurniawan Putra Santoso
Jurnal Ilmiah Teknik Sipil Vol. 28 No. 2 (2024): Jurnal Ilmiah Teknik Sipil, Vol. 28 No. 2, September 2024
Publisher : Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JITS.2024.v28.i02.p09

Abstract

An increase in population by 1.04% and crop area by 14.08% in Bali Province, will also increase the water needs. Dam as water infrastructure that supports water availability, is needed in overcoming the problem. Dams require operation and maintenance (O&M) to keep function optimally. Operation and maintenance costs need to be evaluated periodically with the real needs of operation and maintenance. Real needs of operation and maintenance suitability can guarantee the optimal functioning of the dam. This study evaluated the suitability of Balinese dam’s operation and maintenance, namely Benel Dam, Telaga Tunjung Dam, Gerokgak Dam, and Palasari Dam. Dam performance appraisals include physical, operational security, and institutional ranging from 0 to 100. The results the grouped into good, enough, less, and bad category. All four dams got “enough”, so their real needs number for operation and maintenance need to be evaluated. The evaluation showed that Gerogkak Dam had the largest real needs number for operation and maintenance value, which is IDR 28,767,099,149. The real needs of operation and maintenance value is consisted of ≥ 90% dredging’s cost. Dredging’s cost us mainly influenced by sediment’s volume. So, to reduce sediment’s volume and improve dam’s performance for irrigation, it is necessary to increase the efficiency of dam’s operation and maintenance. Efficient dam operation also necessary due to the limited operators. Building efficiencies that control sediment and water supply, must be increase aligned with water needs and reservoir conditions.
Co-Authors Fransisca Natania Karina Rediasti Ida Bagus Gede Indrayana Istiarto Rachmad Jayadi