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All Journal Jurnal Teknik Sipil MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Ilmiah Desain & Konstruksi Jurnal Teknik Pengairan: Journal of Water Resources Engineering Journal of the Civil Engineering Forum Civil Engineering Journal Jurnal Irigasi Civil and Environmental Science Journal (CIVENSE) Jurnal Aplikasi Teknik Sipil Jurnal Rekayasa Sipil Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Jurnal Teknik Sipil JURNAL SUMBER DAYA AIR Jurnal Teknik Sumber Daya Air Jurnal Sains dan Teknologi Tadulako Jurnal Forum Teknik Sipil Jurnal Lembaga Pengabdian Kepada Masyarakat Undana

Denik Sri Krisnayanti

Civil Engineering Study Program, Nusa Cendana University

Author-ID : 300204

Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Social Sciences Transportation

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A Study of Curve Number (CN) Values in Flood-Prone Watersheds in the Flores River Basin.: Kajian Nilai Curve Number (CN) Pada Daerah Aliran Sungai (DAS) Yang Rentan Banjir Di Wilayah Sungai Flores Krisnayanti, Denik Sri
Jurnal Sains dan Teknologi Tadulako Vol 12 No 1 (2026): April 2026
Publisher : Postgraduate Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/jstt.v12i1.1046

Floods are natural disasters that frequently occur as a result of global climate change, land-use conversion, and human activities that damage the environment. Based on data from the 2017 Water Resources Management Pattern (PSDA) of the Flores River Basin, there are 23 flood-prone areas across 12 watersheds in the region. This study focuses on the Magepanda and Kolisia watersheds in Sikka Regency, East Nusa Tenggara, with respective areas of 61.439 km² and 32.740 km². The purpose of this research is to determine the flood discharge in both watersheds using 22 years (2003–2024) of GPM satellite rainfall data. Rainfall distribution analysis was conducted using the Normal, Log Normal, Log Pearson Type III, and Gumbel methods, while flood discharge calculations were performed using the Synthetic Unit Hydrograph (HSS) SCS-CN method through the HEC-HMS application. The results show that the peak flood discharge in the Magepanda watershed ranges from 105,8 m³/s for a 2-year return period to 793,9 m³/s for a 1000-year return period. Meanwhile, the Kolisia watershed has peak flood discharge values ranging from 68,9 m³/s for a 2-year return period to 452,6 m³/s for a 1000-year return period.

Hydraulic Analysis of the Morning Glory Spillway at the Manikin Dam Banamtuan, William Fr.; Krisnayanti, Denik Sri; Hangge, Elsy E.; Klau, Ralno Robson
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 11, No 1 (2026): EDISI MARET 2026
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v11i1.7579

In this research, the Manikin Dam will use a Morning Glory-type spillway structure. The dam, which draws its water from the Manikin River and has a watershed area of 49.31 km², is designed as a Random Rubble Limestone Fill Type with a Vertical Core. It has a storage capacity of 28.20 million m³ and a normal inundation area of 148.7 hectares. The Manikin Dam is planned to meet the irrigation needs of 310 hectares of agricultural land in Kupang Regency and serve as a raw water source of 700 liters/second for both Kupang City and Kupang Regency. It will also function as a Micro-Hydro Power Plant (PLTMH) with a capacity of 0.125 MW and provide flood control with a capacity of 531.70 m³/second. Based on technical data, the dam has an inlet diameter of 11.78 m, a throat section length of 20 m, and a tunnel length of 610.74 m. This study uses quantitative data, including both primary and secondary sources. The objective of this research is to determine the flow characteristics within the Morning Glory spillway structure when subjected to a 1000-year design flood discharge (Q1000). The hydraulic analysis of the spillway uses the continuity equation and Bernoulli's equation, with the discharge coefficient (Cd) calculated using the Iwasaki method approach. Based on the research results, the flow within the tunnel and downstream of the stilling basin is supercritical.

Analisis Debit Tersedia pada DAS Temef dengan Menggunakan Metode NRECA, F.J. Mock dan Tangki Krisnayanti, Denik Sri; Udiana, I Made; Chandra, Chrystin; Welkis, Davianto Frangky B.
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 27, Nomor 2 (2021)
Publisher : Department of Civil Engineering, Diponegoro University

Temef Dam is located in Oenino Village Oenino District and Konbaki Village Polen District, Timor Tengah Selatan Regency which has a capacity of 45.79 millions m3. This research aimed to determine the amount of potential evapotranspiration using Penman Modification Method, the amount of dependable discharge with three methods that are NRECA, F.J. Mock, and Tank Methods, from those three methods will be selected a method that have closest characteristic of Temef Watershed, and filling timein Temef Reservoir. The maximum half monthly potential evapotranspiration in Temef Watershed using Penman Modification Method is 142.72 mm and the minimum is 71,25 mm. The average of annual discharge using NRECA Method is 249.89 m3/sec, F.J. Mock Method is 258.66 m3/sec, and Tank Method is 92.15 m3/sec. Based from three methods that have been used, Tank Method is the closest method to the characteristics of Temef Watershed, which RMSE value from Tank Method is 2.99. Filling time of Temef Reservoir to reach the planned reservoir volume in normal water year condition is three months and fifteen days and in low water year condition is six months.

Penentuan Parameter Model NRECA Untuk Debit Pada DAS Temef Krisnayanti, Denik Sri; Chandra, Chrystin; Bunganaen, Wilhelmus; Udiana, I Made; Damayanti, Alvine Cinta
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 28, Nomor 1 (2022)
Publisher : Department of Civil Engineering, Diponegoro University

A watershed in which the observed discharge data is not available or incomplete becomes a problem in thewater utilization projects. Observation discharge data obtained from Pos Duga Air Sungai Temef is less reliable because the measurement of water level data for the last few years has been carried out by direct observation without using a discharge measuring device. Obtain river discharge data, it can be done by simulating rainfall data into discharge data, one of them is NRECA Model. In NRECA Model, there are several parameters, namely index soil moisture capacity (nominal), Percent Sub Surface (PSUB), Ground Water Flow (GWF), and crop coefficient (kc). Determination of the parameters NRECA Model was obtained by trial and error based on the value limit so that the coefficient correlation (r) between observation discharge and simulation discharge was close to 1. The values used for the index soil moisture capacity (nominal), percent sub surface (PSUB), ground water flow (GWF), and crop coefficient (kc) are 0,20; 0,85; 0,50; and 0,60.

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

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 A. Nursyam, Nurul Alvine C. Damayanti Alvine C. Damayanti Alvine C. Damayanti Ananda, Yokti Anang Galang Anargi Djalil Mangu Andi H. Rizal Andi Kumalawati Banamtuan, William Fr. Chandra, Chrystin Costandji Nait Damayanti, Alvine Cinta Dantje A. T. Sina Davianto F. Welkis Davianto Frangky B. Welkis Davianto Frangky B. Welkis Decaprio, Alex Demonsa Bintang Putra Lende Djoko Legono Djoko Legono Doa Megonondo, Batara Dolly W. Karels Elia Hunggurami Eugenius Nino Mbauth F. B. Welkis, Davianto Fery Moun Hepy Forisman R. Nomnafa Galla, Andrea Z. Hamdan Nurdin Hangge, Elsy E. Henry Jefrison Benu I Made Udiana I Made Udiana Jacob Kedoh John H. Frans John Hendrik Frans Jordy Georgia Makunimau Judi K Nasjono Judi K. Nasjono Jusuf J. S. Pah Khaerudin, Dian Noorvy Klau, Ralno R. Klau, Ralno Robson Lomi, Desinta Banni M. Solichin Maulana, Mahendra Andiek Megonondo, Batara Doa Mirnawati S Pasoa Munaisyah, Farah Nait, Costandji Nichorids S Saudale Pah, Jusuf J.S Partogi H. Simatupang, Partogi H. Pasoa, Mirnawati S Philipi de Rozari Remigildus Cornelis Robson Klau, Ralno Rohi D. Radja Pono Rosmiyati A Bella Ruslan Ramang Ruslan Ramang SATRIYAS ILYAS Seran, Yustinus A. Sereh, David Peterson Sri Wahyuni Suhardjono Suhardjono Syamsumarlin, . Taopan, Angelio A Tatas, Tatas Tri M. W. Sir Tri M.W. Sir Tri M.W. Sir Very Dermawan Vilkanova C. Garu Welkis, Davianto Frangky B. Wilhelmus Bunganaen Wilhelmus Bunganaen Wilhelmus Bunganaen Wilhelmus Bunganaen Wilhelmus Bunganaen Wilis, Kezia Georginia Patricia Willem Sidharno Yerison Dimu Ratu Yunita A. Messah Yustinus Akito Seran

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