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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik Pengairan: Journal of Water Resources Engineering
Nait, Costandji
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Civil Engineering, Building, Construction & Architecture Engineering

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Analisis Pengisian Awal (Impounding) pada Bendungan Raknamo Dengan Model Tangki Krisnayanti, Denik S; Bolla, Margareth E; Bunganaen, Wilhelmus; Damayanti, Alvine C; Nait, Costandji; Amaral, Bilgardo E.D.N.R
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 26, Nomor 1 (2020)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (782.897 KB) | DOI: 10.14710/mkts.v26i1.26757

Abstract

The impounding of the dam is the step that will be done after construction work on the dam be finished. This study aims to determine a long time and the volume of inflow on Raknamo dam in dry water year, low water year, normal water year and wet water year with tank model. Factors that affected the time of the first impounding of the dam is the amount of rainfall and evapotranspiration that has come in to the catchment area. The total volume of annual inflow Raknamo reservoir obtained in dry water year was in 15,489 million m3, low water year equal to 23,696 million m3, normal water year equal to 32,892 million m3 and wet water year equal to 44,068 million m3. In the calculation of the length of time filling the Raknamo reservoir used the volume of low water year. The accumulation of the volume of every month calculated so that length of time filling the Raknamo reservoir can reach the volume of planned at 14.091 million m3 within three a half months (three months fifteen days).
Discharge Availability Analysis of the Manikin Dam Using the F. J. Mock and NRECA Methods A. H. Welkis, Wilberd; Krisnayanti, Denik Sri; Robson Klau, Ralno; Nait, Costandji; F. B. Welkis, Davianto; Doa Megonondo, Batara
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 17 No. 1 (2026)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2026.017.01.9

Abstract

East Nusa Tenggara is a semi-arid region with a relatively short rainy season and low annual rainfall of 1,250 mm/year. To address this condition, technical engineering measures are required, including the construction of water storage infrastructure, such as the Manikin Dam. Manikin Dam is located between Kuaklalo Village and Bokong Village, Taebenu District. This study aims to determine potential evapotranspiration using the Modified Penman Method and dependable discharge using two methods: the NRECA Method and the F.J. Mock Method. From these two methods, the one that best represents the characteristics of the Manikin watershed was selected. The results showed that the maximum half-monthly potential evapotranspiration in the Manikin watershed, calculated using the Modified Penman Method, is 97.7 mm, and the minimum is 44.2 mm. The average annual reliable discharge with the NRECA Method is 2.09 m3/s. The annual dependable discharge with the F. J. Mock Method is 1.35 m3/s. Of the two methods used, the NRECA Method is closest to the characteristics of the Manikin watershed, with an RMSE of 0.85. The filling time of Manikin Reservoir under normal water-years conditions is three months, from the first part (I) in December to the second part (II) in February. The time required to fill Manikin Reservoir for low-water-years conditions is three months, from the first part (I) of December to the first part (I) of March.  
Co-Authors A. H. Welkis, Wilberd Amaral, Bilgardo E.D.N.R Damayanti, Alvine C Denik Sri Krisnayanti Doa Megonondo, Batara F. B. Welkis, Davianto Krisnayanti, Denik S Margareth E. Bolla Robson Klau, Ralno Wilhelmus Bunganaen