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All Journal Civil Engineering Forum Teknik Sipil Inersia : Jurnal Teknik Sipil dan Arsitektur Jurnal Ilmiah Desain & Konstruksi Jurnal Teknik Pengairan: Journal of Water Resources Engineering agriTECH Semesta Teknika Teknisia Jurnal Teknik Sipil Info-Teknik Journal of the Civil Engineering Forum Simposium II UNIID 2017 Inersia : Jurnal Teknik Sipil Spektrum Sipil Lowland Technology International Journal of the Civil Engineering Forum Jurnal Teknik Sumber Daya Air Prosiding Seminar Nasional Teknik Sipil UMS Teknologi Sipil : Jurnal Ilmu Pengetahuan dan Teknologi Jurnal Geografi LIngkungan Tropik (Journal of Geography of Tropical Environments)
Rachmad Jayadi
Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Environmental Science Transportation

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STUDI PENGARUH PERUBAHAN TATAGUNA LAHAN TERHADAP KARAKTERISTIK BANJIR KOTA BIMA Ismoyojati, Goyu; Sujono, Joko; Jayadi, Rachmad
Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments) Vol. 2, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The high intensity rainfall in December 21st 2016 has caused major flooding in Bima City. It caused infrastructure destructs and considerable losses. The condition of the watershed in the upstream experiencing decrease of forest area and the gorwth of the city were suspected as some of the factors causing the big flood. Significant land-use changing brought impact on the changes of watershed response to rainfall. The purpose of this research was to determine the effect of land use changing on the flood occurence based on the hydrological model of rainfall-flow in Rontu watershed in the City of Bima. In this research, the effect of land use changing was analyzed by determining the value of curve number (CN) of the watershed in 1996, 2006 and 2016. CN was calculated with the help of HEC-GeoHMS 10.3 software. Furthermore, CN value was used in effective rainfall calculation as the input of hydrograph flood simulation by using the Nakayasu synthetic unit hydrograph transform model. The result showed that other than extreme rainfall, the flood was also affected by the land use changing. In Rontu watershed, over the past twenty years (1996 to 2016), land use changing composition occured i e. 28,68% forest decrease, 3,10% settlement increase, 26,83% farm field incease, 5,82% shrubs decrease and 3,62% rice field increase. Such changing in wet conditions in Padolo sub-watershed resulted in increasing CN of 4,55%, peak discharge of 10,26% and runoff volume of 9,82% and in Malayu sub-watershed resulted in increasing CN of 6,78%, peak discharge of 17,29% and runoff volume 18,00%.
Hydrodynamic Modeling for Enhance Water System in Katingan Tidal Lowlands Kamil, Insanul; Rachmad Jayadi; Adam Pamudji Rahardjo; Yakubson
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 15 No. 1 (2024)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2024.015.01.10

Abstract

A study was conducted on the Katingan tidal lowland area with hydro-topography A and B. The lowland area has good irrigation capability but low drainage capability, resulting in excessive inundation. This study aims to enhance drainage capability and control water levels in rice fields. HEC-RAS is used to model the hydrodynamics of canals and rice fields. There are three scenarios for improving the water system, namely embankments (1), embankments and pipes (2), and embankments, pipes, and gates (3). In the normalized canals, inundation in the middle of the rice field is more than 35 cm and continuous inundation. This is due to the low elevation of the middle area, which results in low drainage capability. The embankment (1) prevents the tide from overflowing into the rice fields, but the rice fields are deficient in water. Embankments and pipes (2) can fulfill the water need for irrigation but not increase drainage capability. Embankments, pipes, and gates (3) can maintain irrigation capability and improve drainage capability. The water level can be maintained at 7-10 cm at land elevation +3.40 m, but land with elevation +3.50 m has a water deficiency. The third scenario is the most appropriate for controlling water levels in rice fields. Water system improvement in tidal lowlands must be considered to avoid water deficiency. Drought in tidal lowlands causes pyrite to oxidize, leading to increased soil acidity. Therefore, irrigation capability must be maintained to improve the water system on land with hydro-topography A and B.
Evaluation of Satellite-based Rainfall Data in Flood Prediction Wisnulingga, Bayu Krisna; Sujono, Joko; Jayadi, Rachmad
Semesta Teknika Vol 26, No 2 (2023): NOVEMBER
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i2.19036

Abstract

Rainfall-runoff transformation is a solution to the difficulty of obtaining observed discharge data in flood prediction analysis. Rainfall-runoff transformation requires observed rainfall data with a high rate of accuracy spatially. However, observed rainfall data is also often not available. Satellite rainfall data is commonly used to replace observed rainfall data. However, the accuracy of satellite rainfall data still needs to be tested. This study applied rainfall-runoff transformation to the observed rainfall data and the PERSIANN, GPM, and GSMaP satellite rainfall data in the Opak Watershed using GAMA I SUH method, which were then compared with the observed hydrograph at the AWLR Kretek during the flood event that occurred in Yogyakarta Province due to Cyclone Cempaka to evaluate their accuracy. The results showed that the GPM data generated a hydrograph that is the closest to the observed hydrograph, both the shape and the peak of the hydrograph.
PERFORMA HIDRAULIKA AMBANG DAN PINTU KLEP UNTUK SKENARIO REWETTING: KAJIAN PEMODELAN AWAL KANAL SUKA PINDAH SUAKA MARGASATWA PADANG SUGIHAN: Hydraulic Performance of Overflow Weirs and Flap Gates for Peatland Rewetting: A Preliminary Modeling Study of Suka Pindah Canal Padang Sugihan Wildlife Reserve Santoso, Kurniawan Putra; Wignyosukarto, Budi Santoso; Jayadi, Rachmad
Spektrum Sipil Vol 12 No 2 (2025): SPEKTRUM SIPIL
Publisher : Jurusan Teknik Sipil Fakultas Teknik Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/spektrum.v12i2.403

Abstract

The Padang Sugihan Wildlife Reserve is facing the threat of fires, which have a detrimental impact on the ecosystem of the Sumatran Elephant habitat. To mitigate this risk, this research aims to evaluate the hydraulic efficiency of overflow weir and flap gates as interventions for peatland restoration in the Suka Pindah Canal. 1D HEC-RAS modeling indicates that without control structures, tidal fluctuations at the estuary are ineffective in maintaining soil moisture. The scenario with a flap gate at the Suka Pindah Canal estuary can increase the volume of water by up to 115% compared to the existing condition, but this water structure requires well maintenance. In contrast, an overflow weir that is 1.5 times wider than the flap gate scenario proves to be more efficient, with a 72% better increase in water volume than the flap gate, as well as a simpler design. Further analysis shows that the upstream area of the canal, consisting of low-elevation land (natural ponds), has the potential to double the water retention capacity in the canal and land. These findings indicate that control structures are effective for rewetting efforts.
Hydrodynamic Modeling for Enhance Water System in Katingan Tidal Lowlands Kamil, Insanul; Rachmad Jayadi; Adam Pamudji Rahardjo; Yakubson
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 15 No. 1 (2024)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2024.015.01.10

Abstract

A study was conducted on the Katingan tidal lowland area with hydro-topography A and B. The lowland area has good irrigation capability but low drainage capability, resulting in excessive inundation. This study aims to enhance drainage capability and control water levels in rice fields. HEC-RAS is used to model the hydrodynamics of canals and rice fields. There are three scenarios for improving the water system, namely embankments (1), embankments and pipes (2), and embankments, pipes, and gates (3). In the normalized canals, inundation in the middle of the rice field is more than 35 cm and continuous inundation. This is due to the low elevation of the middle area, which results in low drainage capability. The embankment (1) prevents the tide from overflowing into the rice fields, but the rice fields are deficient in water. Embankments and pipes (2) can fulfill the water need for irrigation but not increase drainage capability. Embankments, pipes, and gates (3) can maintain irrigation capability and improve drainage capability. The water level can be maintained at 7-10 cm at land elevation +3.40 m, but land with elevation +3.50 m has a water deficiency. The third scenario is the most appropriate for controlling water levels in rice fields. Water system improvement in tidal lowlands must be considered to avoid water deficiency. Drought in tidal lowlands causes pyrite to oxidize, leading to increased soil acidity. Therefore, irrigation capability must be maintained to improve the water system on land with hydro-topography A and B.
Optimasi Pemanfaatan Air Waduk Tukul menggunakan Model Simulasi Operasi Waduk Multi Kriteria Hadthya, Reinhart; Jayadi, Rachmad; Pratiwi, Endita Prima Ari
Prosiding Seminar Nasional Teknik Sipil UMS 2020: Prosiding Seminar Nasional Teknik Sipil UMS
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1444.008 KB)

Abstract

Pembangunan Waduk Tukul yang berlokasi di Desa Karanggede, Kecamatan Arjosari, Kabupaten Pacitan direncanakan memiliki manfaat untuk penyediaan air baku, penyediaan air irigasi dan pembangkit listrik tenaga mikrohidro. Untuk menghasilkan pemanfaatan air waduk yang optimal, diperlukan kajian ilmiah tentang operasi waduk yang berorientasi multi kriteria. Pada penelitian ini dilakukan analisis ketersediaan air menggunakan model alihragam hujan aliran metode Mock, kebutuhan air irigasi dan kebutuhan air baku. Selanjutnya dilakukan simulasi pengaturan release air waduk berbasis neraca air menggunakan metode Standard Operating Rule (SOR). Kriteria pemanfaatan air optimum didasarkan pada intensitas tanam, faktor k, reliabilitas layanan air irigasi dan air baku. Berdasarkan hasil perhitungan neraca air terdapat defisit air tertinggi adalah sebesar 7,09 MCM, yaitu pada tengah bulan ke dua bulan Desember. Optimasi pemanfaatan air Waduk Tukul menghasilkan intensitas tanam 262,65% dengan rerata faktor k irigasi dan air baku sebesar 0,97 dan 0,88 serta reliabilitas layanan air irigasi dan air baku berturut-turut 93,99% dan 85,08%.
Co-Authors Adam Pamudji Rahardjo Adam Pamudji Rahardjo Aderita Mariana Takeleb Ahmad Rifa’i Ahmad Rifa’I Ali Trusharyanto Aminullah, Akhmad Anantri Sulistyowati Anggi Nidya Sari Anggraheni, Dinia Bambang A. Kironoto Bambang Agus Kironoto Bambang Kuncoro Hari Bambang Triatmodjo Bambang Trihatmodjo, Bambang Bayu Krisna Wisnulingga Benjamin J.B. Nanlohy C. Lestari Saptarini N. Darajat, Achmad Rafi’ud Darmanto Darmanto Djoko Legono Endita Prima Ari Pratiwi Endita Prima Ari Pratiwi Fatchan Nurrochmad Fransisca Natania Karina Rediasti Goyu Ismoyojati Hadthya, Reinhart Henggar Risa Destania Heriantono Waluyadi Hesti Subiyanti Hesti Subiyanti, Hesti INTAN SUPRABA Ismoyojati, Goyu Istiarto Istiarto Istiarto Istiarto Istiarto Istiarto Istiarto Joko Sujono Joko Sujono Joko Sujono Joko Sujono Joko Sujono Joko Sujono Kabul Basah Suryolelono Kabul Basah Suryolelono Kamil, Insanul Koichiro Ohgushi Kurniawan Putra Santoso Lidwina Putri Astani Lukman Hidayat Lukman Hidayat Murtiningrum Murtiningrum Pamungkas, Yusuf Aji Putu Sudira Putu Sudira Putu Sudira Roby Hambali Sahid Susanto Santoso, Kurniawan Putra Sardi Sardi Sri Haryanti Sri Haryanti Sudjarwadi Sudjarwadi Triyoso, Christopher Wignyosukarto, Budi Santoso Yakubson Yohana Lilis Handayani Yotam Adiel Haryanto Yusuf Aji Pamungkas