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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 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 Advances In Social Humanities Research
Denik Sri Krisnayanti
Civil Engineering Study Program, Nusa Cendana University
Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Social Sciences Transportation

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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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (521.776 KB) | DOI: 10.14710/mkts.v28i1.42035

Abstract

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

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.  
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 Denik Sri Krisnayanti
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

Abstract

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.
Integrated Modeling of Nature-Based Solutions for Flood Mitigation and Enhancement of Ecosystem Services in the Kupang City Watershed Lukim Nomleni; Denik Sri Krisnayanti; Hamza H. Wulakada
Advances In Social Humanities Research Vol. 4 No. 8 (2026): Advances In Social Humanities Research
Publisher : Sahabat Publikasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46799/adv.v4i8.590

Abstract

Flooding in Kupang City has increasingly been associated with watershed degradation, urban expansion, reduced infiltration capacity, and the region’s semi-arid climatic characteristics, highlighting the need for sustainable flood-mitigation strategies. This study aimed to evaluate integrated Nature-based Solutions (NbS) for reducing flood risk and enhancing ecosystem services in the Kupang City watershed. A quantitative approach was applied using hydrological and system-dynamics modeling. Rainfall, land-cover, soil, population, and spatial data were analyzed using ArcGIS, HEC-HMS, Powersim Studio 10, and the InVEST model. The Oesapa Besar watershed was selected as the representative case. The results showed that HEC-HMS generated a 100-year return-period peak discharge of 325.80 m³/s, while calibration using the Snyder unit hydrograph and Green-Ampt infiltration method supported the reliability of the design-flood analysis. NbS interventions, including vegetation enhancement, green infrastructure, and retention ponds, reduced the Curve Number (CN) from 79.27 in 2015 to 76.60 in 2050 and decreased surface runoff from 71.95 mm to 71.45 mm. The InVEST analysis also indicated a more stable annual water yield and improved urban flood-mitigation capacity through enhanced infiltration and water retention. The study concluded that integrated NbS modeling provides an effective basis for sustainable, ecosystem-based watershed management and long-term flood resilience in Kupang City under continued urban development and future climate-related hydrological pressures.
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 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 Hamza Huri Wulakada 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 Lukim Nomleni M. Solichin Maulana, Mahendra Andiek Megonondo, Batara Doa Mirnawati S Pasoa Munaisyah, Farah Nait, Costandji Nichorids S Saudale 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