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REVITALISASI JARINGAN IRIGASI RAWA SUB-SEKUNDER UNTUK MENINGKATKAN PRODUKTIFITAS HASIL PERTANIAN (STUDI KASUS IRIGASI SUB-SEKUNDER RAWA PITU SP 2) Arifaini, Nur; Zakaria, Ahmad; Setiawan, Randy
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 3 (2014): Edisi Desember 2014
Publisher : UNIVERSITAS LAMPUNG

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Lampung Province has a fairly wide swamp area, one of them is in Rawa Pitu area. Swamp irri- gation in Rawa Pitu area has not been used extensively. The purpose of this research is to conduct a study, analysis, and systematically arranged recommendations on revitalizing Rawa Pitu swamp area that can be optimized to increase food crops production in order to improve the welfare of society. The research site is located in the sub-district of Rawa Pitu, Tulang Bawang regency. The location of Rawa Pitu is between the Tulang Bawang and the Pidada rivers. Analysis in this study is more focused on the revitalization of the sub-secondary of swamp irrigation system to increase agricultural productivity in Rawa Pitu area by comparing before and after revitalization. From the calculation, it is obtained that: the maximum of 3 days cumulative daily rainfall with the 5 years return period is obtained 104,12 mm and the amount of drainage modulus is obtained at 4,016 mm / day. Agricultural yield before revitalized, for the rice, the profit is Rp.13.697.819.386,- and for the crops, the profit is Rp.12.452.563.078.-. Agricultural production after revitalized is in- crease, for the rice, the profit is Rp.18.739.594.819,- and for the crops, the profit is Rp.17.035.995.290,-. The value of benefit cost ratio is about 1,38 and it is greater than 1,0, so that there is a profit, and net present value is positive, it is Rp.7.642.988.768,-.
Cover Belakang Jurnal Rekayasa Edisi Desember 2014 Zakaria, Ahmad
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 3 (2014): Edisi Desember 2014
Publisher : UNIVERSITAS LAMPUNG

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Cover Belakang Jurnal Rekayasa Edisi Desember 2014
Analisis dan Perencanaan Sistem Drainase di Lingkungan Universitas Lampung (Studi Kasus Zona I : Fakultas Teknik, Fakultas Ekonomi dan Bisnis, Fakultas Ilmu Sosial dan Politik, Fakultas Hukum) Jamaludin HN, .; Purwadi, Ofik Taufik; Zakaria, Ahmad
Jurnal Rekayasa Sipil dan Desain Vol 6, No 2 (2018): Edisi Juni 2018
Publisher : Jurnal Rekayasa Sipil dan Desain

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University of Lampung as one of the first and oldest public university in Lampung Province is one of the best universities in the region of Sumatra and continuously improve the quality of its academic, with the Accreditation A. Enhancement and infrastructure facilities university of Lampung continue, so can improving the academic quality or non-academic. The form of non-academic quality improvement is the environmental arrangement of one of its plans development of drainage system. This is intended to solve some of the flooding puddles that occurred at the time rainy season arrives because not optimal condition of existing drainage in University of Lampung region . The analysis conducted in this research includes hydrology analysis and hydraulics analysis using HEC-RAS 4.1.0 application. Hydrology analysis aims to calculate the design discharge using rational methods and modeling with HEC-RAS 4.1.0 application aims to determine the capacity of the water level existing channel. So it can be known where the position of the flood point and planning the new channel dimensions. Based on the analysis, the need for planning new drainage at some point indicating the occurrence of run off and inundation at Kantin Teknik Prasmanan. Planning of absorption wells and retention ponds is also very needed to overcome the problem of frequent flooding in Faculty of Engineering. It is also necessary to maintain channel maintenance in the form of channel normalization, garbage retaining lattice installation, and periodic cleaning of channels.Keywords: hydrology, hydraulics, HEC-RAS 4.1.0, drainage, absorption wells, andretention ponds.
Analisis Perhitungan Stabilitas Lereng dengan Metode Fellenius (Ordinary Method of Slice) Menggunakan Program PHP (Professional Home Page Hypertext Preprocessor) Fatria, Akhmad Ridho; Iswan, Iswan; Zakaria, Ahmad
Jurnal Rekayasa Sipil dan Desain Vol 4, No 2 (2016): Edisi Juni 2016
Publisher : Jurnal Rekayasa Sipil dan Desain

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Slopes as we know is a sloping ground surface and forming an angle to a horizontal plane andunprotected. Slopes there are generally divided into two categories of land slope, the naturalslopes and artificial slopes. Slope collapse could occur as a result of thrust arising due to the loadon the ground. In the method of calculation of the safety factor of the slope stability, a methodfrequently used in calculating the slope stability is by Fellenius method (Ordinary Method ofSlice), Fellenius method first introduced by Fellenius, slope stability calculations with Felleniusmethod if the count is use a lot of complicated manual calculations so that it becomes lesspractical and relatively take times.One effort to get the accurate calculation of slope stability in a short time, which is by making thesafety factor calculation program on the stability of the slope using a programming language.From the comparison calculation with the program and the results of manual counting,Calculating the percentage difference of less than 1 %, so the program can be used. With the datathat you have this program is able to calculate with no more than 1 minute after entering the dataslope previously calculated manually. While for the time that is required in calculating or writingthe result of manual calculation takes more than 60 minutes. Then it will produce time efficiencyfaster than using a manual calculation.Keywords: Analysis of Slope Stability, Safety Factor, Fellenius Method, PHP
Efisiensi Penurunan Kadar COD, TSS, dan TDS pada Air Limbah Industri Pangan menggunakan Koagulan Poly Alumunium Chloride dengan metode Jar Test Zakaria, Ahmad; Sauri, Sopian; Fadela, Dian Mira; Wardhani, Puspita Sri Ayu
WARTA AKAB Vol 45, No 2 (2021): Warta AKAB
Publisher : Politeknik AKA Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (306.256 KB) | DOI: 10.55075/wa.v45i2.60

Abstract

Industri pangan menghasilkan air limbah berbahan organik dan padatan tersuspensi maupun terlarut yang tinggi. Salah satu proses pengolahan air limbah yaitu dengan proses koagulasi-flokulasi yang bertujuan untuk menghilangkan padatan tersuspensi dan zat organik yang dapat menyebabkan kekeruhan serta bau dengan penambahan koagulan. Penambahan koagulan pada instalasi pengolahan air limbah (IPAL) tidak dilakukan secara kuantitatif, sehingga perlu dilakukan percobaan dengan metode jar test. Tujuan percobaan untuk mengetahui pH dan dosis optimum serta efisiensi koagulan poly aluminium chloride (PAC) untuk menurunkan kadar chemical oxygen demand (COD), total suspended solid (TSS), dan total dissolved solid (TDS). Hasil uji parameter COD, TSS, dan TDS dibandingkan dengan Surat Keputusan Gubernur Tingkat 1 Jawa Barat (SK Gub TK 1 Jabar) No. 6 Tahun 1999 tentang Baku Mutu Limbah Cair Bagi Kegiatan Industri di Jawa Barat. Berdasarkan hasil percobaan diperoleh kondisi optimum koagulan PAC pada pH air limbah 6–7 dengan dosis koagulan optimum pada (80–90) mg/L. Hasil pengujian parameter TS, TDS, TSS, kekeruhan dan COD berturut-turut memberikan nilai efisiensi sebesar (52,6-57,8)%, (53,9-55,5)%, (52,4-58,1)%, (97,8-99,1)%, dan (71,6–77,1)%. Percobaan yang dilakukan membuktikan bahwa koagulan PAC mampu menurunkan kadar pada parameter uji dengan nilai efisiensi yang cukup besar.
Mathematical reasoning ability based on students anxiety in STAD learning with performance assessment Zakaria, Ahmad; Amidi, Amidi
Unnes Journal of Mathematics Education Vol 9 No 1 (2020): Unnes Journal of Mathematics Education
Publisher : Department of Mathematics, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ujme.v9i1.38101

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Mathematical reasoning ability is very important for students in solving a problem, but the Indonesian student’s mathematical reasoning ability is still not optimal. The purpose of this research is (1) to test student’s mathematical reasoning abilities in Student Team Achievement Division (STAD) learning with Performance Assessment achieving learning completeness, (2) to describe mathematical reasoning abilities based on student anxiety in STAD learning with Performance Assessment. This research is a mixed methods research with concurrent embedded design. The population in this study were students of grade VIII Islamic Junior High School in Kendal Central Java in the 2018/2019 academic year. Random sampling technique is used as a sampling method and the subject is determined with a purposive sampling technique. The results showed that STAD learning with Performance Assessment achieved classical completeness, namely more than 75% of students who participated in STAD learning with Performance Assessment reached 70 scores. Mathematical reasoning ability of students with low anxiety described as very good in fulfilling all indicators of mathematical reasoning ability i.e. submitting guesses, doing manipulation/mathematical calculations, drawing conclusions, and giving reasons for solutions. Mathematical reasoning ability of students with medium anxiety described as fulfilling indicators submitting guesses, doing manipulation/mathematical calculations, and drawing conclusions. Description of mathematical reasoning abilities of students with high anxiety is only able to fulfill the indicator of submitting guesses. In other indicators of mathematical reasoning ability, students with high anxiety are less able to understand the problem well.
Pemetaan Kemiringan Lereng Menggunakan Software Geographic Information System Pada Sub DAS Way Pubian Setyanugraha, Tegar; Romdania, Yuda; Herison, Ahmad; Zakaria, Ahmad
Jurnal Rekayasa Sipil dan Desain Vol 11, No 2 (2023): Edisi Juni 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Land use utilization in a watershed must pay attention to the slope. The slope that will be analyzed is the slope of the Way Pubian Subwatershed, Way Seputih Watershed, Lampung Province. Over time, population growth will increase in the Way Pubian Subwatershed area resulting in land use change which is an important trigger factor for landslides. Perhaps slope mapping has been done in many places, but for the Way Pubian Subwatershed area it has never been done. So it is important to conduct slope mapping in the Way Pubian Subwatershed. The purpose of the study was to conduct slope mapping and its classification using ArcGIS. Based on the results of the analysis with ArcGIS obtained slope map in Way Pubian Subwatershed with five classifications namely flat (0-8%), ramps (8-15%), rather steep (15-25%), steep (25-45%), and very steep (>45%). Way Pubian Subwatershed has an area of 11,562.8762 Ha where 3,026.7852 Ha (26.1767%) is the classification of 25-45% slope class (Steep) which is the largest compared to the area of other classification classes. In the classification class flat (0-8%), ramps (8-15%) and rather steep (15-25%) do not have too much difference. While the very steep classification class (>45%) is the area with the least area. The conclusion is that the slope map is obtained with the largest classification of slope is in the steep class.
Analisis Perbandingan Peramalan Data Pemrograman Pasang Surut Anfor Dengan Data Pengukuran Pasang Surut Admiralty Pada Stasiun Cilacap anggraini, yeshe; Zakaria, Ahmad; Wahono, Endro Prasetyo; Mariyanto, Mariyanto
Jurnal Rekayasa Sipil dan Desain Vol 11, No 4 (2023): Edisi Desember 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Pasang surut air laut merupakan suatu gerakan naik turunnya permukaan udara secara periodik sebagai akibat dari gaya tarik menarik antara bumi, bulan dan matahari. Analisa pasang surut sangat diperlukan dalam penentuan posisi mean level maupun prediksi muka air laut yang dapat dianalisis dengan program admiralty dan program anfor. Pada penelitian ini dilakukan analisis terhadap empat pasang surut selama 15 hari. Pengolahan data analisa program anfor menggunakan software Totis dan analisa program admiralty menggunakan software microsoft excel. Hasil analisa pasang surut program admiralty dan anfor perolehan selisih terbesar yaitu pada komponen S2 sebesar 9,3503 m dari analisa data observasi Cilacap tahun 2015. Sedangkan untuk selisih fase terbesar yaitu pada komponen K2 dari analisa data Cilacap 2014 sebesar 687,6405O . Uji hasil data prediksi masing-masing analisa dengan data pengamatan menunjukkan program lebih baik. Hal ini dapat dilihat dari nilai RMSE program anfor pada empat data lebih kecil dibandingkan program admiralty. Berdasarkan hasil uji dari kedua metode menghasilkan bahwa keuntungan dari program anfor yaitu lebih cepat dan mudah dalam analisa serta menghasilkan komponen pasut lebih banyak dan hasil prediksi yang lebih akurat. Kata kunci : pasang surut, anfor, laksamana, perbandingan
Studi Analisis El Nino Dan La Nina Terhadap Curah Hujan Mengunakan Fast Fourier Transform (FFT) Dan Lomb Periodogram (Studi Kasus : Provinsi Jawa Tengah Fathony, Awal Rifan; Zakaria, Ahmad; Wijaya, Riki Chandra; Kusumaastuti, Dyah Indriana
Jurnal Rekayasa Sipil dan Desain Vol 11, No 2 (2023): Edisi Juni 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Central Java Province is a potential area that has an important role in national food production. El Nino and La Nina events have a very large impact if they occur in Indonesia, especially in Central Java Province. This study aims to analyze the impact of El Nino and La Nina events specifically in Central Java Province where the areas more dominantly affected by El Nino and La Nina. The research location uses 3 rainfall stations, namely the Tunggal Wulung Meteorological Station, Tegal Maritime Meteorological Station, and Tanjung Emas Maritime Meteorological Station. The method used is the Fast Fourier Transform (FFT) method and the long periodogram. The results showed that the periods of El Nino and La Nina phenomena recurring using the FFT method are forecasts for the periods 2.2428, 2.8036, and 3.7381 years. While using the lom periodogram method, namely in the periods of 2,480, 2,621, and 3:16 years. The results of the analysis of the FFT method obtained results that varied in the height of rainfall at the 3 stations, while the results of the analysis using the periodogram log showed that the Tunggal Wulung rain station had the highest peak rainfall. This study concludes that there are variations in the peak incidence using either the slow periodogram or the FFT method. However, both of these methods and based on the BMKG and TRMM, the Tunggal Wulung Meteorological Station has the highest peak between Tegal Station and Tanjung Emas Station.
Kemampuan Mangrove dalam Menjaga Garis Pantai Arief, Farah Diba; Herison, Ahmad; Zakaria, Ahmad; Romdania, Yuda
Jurnal Rekayasa Sipil dan Desain Vol 11, No 1 (2023): Edisi Maret 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Mangrove ecosystems are able to maintain the coastline from abrasion and erosion, and are able to withstand strong winds coming from the ocean to land. The purpose of this study is to determine the ability of roots, litter and sedimentation in maintaining the coastline. The methods to be used are quadrat transect, spot check and laboratory tests. The result is that mangrove roots have the greatest damping effectiveness compared to litter and sedimentation, because mangrove roots have a bouncy force and have a dense density. So it can be concluded that the factors in mangroves that can prevent abrasion due to the impact of sea waves are mangrove roots, litter and sediment that can be a natural damper of environmentally friendly beachfront buildings. The thicker the mangrove ecosystem, the greater the ability to dampen waves. Key words : mangroves, coast, waves, abrasion Ekosistem mangrove mampu menjaga garis pantai dari adanya abrasi dan erosi, serta mampu menahan tiupan angin kencang yang datang dari lautan menuju daratan. Tujuan dari penelitian ini adalah mengetahui kemampuan akar, serasah dan sedimentasi dalam menjaga garis pantai. Metode yang akan digunakan yaitu transek kuadrat, spot check serta uji laboratorium. Hasilnya bahwa akar mangrove memiliki keefektifan peredaman terbesar dibandingkan serasah dan sedimentasi, karena akar mangrove memiliki gaya lenting dan memiliki kerapatan jenis yang padat. Sehingga dapat disimpulkan bahwa faktor pada mangrove yang dapat mencegah abrasi akibat hantaman gelombang laut yaitu akar mangrove, serasah dan sedimen yang dapat menjadi peredam alami bangunan tepi pantai yang ramah lingkungan. Semakin tebal ekosistem mangrove, maka akan semakin besar kemampuan meredam gelombang.  Kata kunci : mangrove, pesisir pantai, gelombang, abrasi
Co-Authors Abyuliani, Alza adama, riri arinda Afifah, Mar'atul Afriami, Lusmeilia Agustriyanto, Dono Ahmad Herison Ahmad Tusi Ahsan, Fathan Naufal Aji Saputra, Aji Aji, Badruzzaman Al Rasyid, Burhan Najib Amanda, Tiara Maelta Amidi Amidi, Amidi Andika, Ivana Aprili Andriansyah, Yeddy Angelina Angelina Anggraini , Melisa anggraini, yeshe Angin, Geleng Perangin Arfanda, Poppy Elisano Arie Pratama Putra Arief, Farah Diba Arifaini , Nur Armijon . Ashruri Ashruri, Ashruri Asrorudin, Udin Atika Sari Atmoko, Fajar Destri Aynuddin, . Aynuddin, Aynuddin Ayu Kurniasih, Ayu Ayuningsih, Titik Cahyo, Febriansyah Dwi Cesar, Irvan Tegar Chairil Anwar Citra Dewi Damayanti, Amelia Nurul Dian Pratiwi Didik Didik Dinaryoko, Arif Diwantari, Windy Putri Djanis, Ratnawati L. Djanis, Ratnawati Lilasari Djasmasari, Wittri Dwi Arnanda Putra, Novindio Dwi Joko Winarno Dyah Indriana K Dyah Indriana Kusumastuti Efendi, Muhamad Masjun Elvida, Maharani Endang Sri Lestari Endro Prasetyo Wahono Fachrurrazie, . Fachrurrazie, Fachrurrazie Fadela, Dian Mira Fathony, Awal Rifan Fatoni, Fatoni Fatria, Akhmad Ridho Fikri, Modh. Haikal Finanda, Reysa Fitria, Mizha Nur Gani, Rama Dian Gatot Eko Susilo Gultom, Winda Maria Rebecca Habib Algifari Handayani, Agustia Hartantio, Fajar Hartoto, Dwi Nanda Putra Hayat, Mohammad Haz, Arzuu Abnu Haziman, Muhammad Luthfan Herawati Herawati Ians Aprilo Ichsani, Muhammad Desyan Idharmahadi Adha Imran, Fadli Indarto, Asyidika Vito Indriana K, Dyah Irvani, Asep Irvan Iswan Iswan Iswan, I Jamaludin HN, . Jauhari Arifin Jerfikanasa Murda, Gung Bagus Joko, Dwi karami, muhammad Karim, Achmad Kholiq, Muhammad Nur Kristianto Usman kuncoro, wahyu hadi Kurniawan, Deri Rahli Kurniawan, Panca Kurniawan, Rizqi Kurniyawan, Ikhfan Kusanti, Nency Dwi Kusumaningsih, Dian Kusumastuti, Dyah Kusumastuti, Dyah I. kuswadi, didit kuswadi Laksmana, M. Bima Lepiana, Tenti Lukitawati, Annika Lusmeilia Afriani M Imran Hasanuddin M Rizky Ismail M. Said Zainuddin Manurung, Lodewick Mapiliandari, Inda Mappaompo, M. Adam Mariyanto Mariyanto Marlina, Indah MMSI Irfan ,S. Kom Muhammad Fadli Murdiagatma, Sefrinta Sasma Nawawi, M Lucky Apriansyah Niken, Chatarina Ningtyas, Widya Nurcahya Novianti, Tika Christy Nugraha , Billy Nugraheni, Melly Nur Arifaini Nurdiani Nurdiani, Nurdiani Nurdiani, . Ofik Taufik P, Ofik Ofik Taufik Purwadi, Ofik Taufik Oktiani, Asri Pelawi, Rinaldi Peranginangin, Imanuel PERMADI, I GUSTI AGUNG DIDIT EKA Persada, Citra Phohan, Phohan Pradipta, Adya Rizky Prasetio, Rizki Lazuardi Pratama, Muhammad Vareza Pratiwi, Ayu Ning Trias Purna, Bagus Mustofa Purwadi , Ofik Taupik Purwadi, Ofik Purwadi, Ofik Taupik Purwadi, Opik Taufik Qur'ani, Mutiara Nurul Rachmanda, Farhan Rachmi, Silvia Rachmy, Silvia Rahayu Sulistyorini Randy Setiawan, Randy Razak, Risdha Sagita Restika Putri Retno Farhana Nurulita Rina Indriani Rinaldi, M. Fahmi Romdani, Yuda Romi Fadly Rosalina Rosalina Rosalina, . Saputra, Datra Peta Saputra, Eko Adi Saputra, Fajar Ilham Saputro, Rifki Ananda Sari, Okta Mulya Sasongko, Respati Anton Sauri, Sopian Septiansari, Annisa Putri Dwi Setia, Vika Setyanugraha, Tegar Sitanaya, Brigitha Cindy Siti Nurdianti Muhajir Siti Nurul Khotimah Slamet Riyadi Styani, Erna Subuh Tugiono, Subuh Suharni Suharni Sumarno, Ari Pitoyo Sumiharni Sumiharni Syah, Aminudin Syahruli, Firman Tambunan, Jenny Anna Margaretha Taufik P, Ofik Tomi, Muhammad Tridawati, Anggun Trisdiana, Fitri Trisnar Adi Prabowo Tuhu Pangestu, Ibnu Usman, Arifuddin W, Endro W, Endro Prasetyo Wahono, Endro Wahono, Endro Praseyto Wardhani, Puspita Sri Ayu widarsono, eko Widya Anggraeni, Widya Wijaya, Riki Chandra Winarno, Dwijoko Yacub, Vanita Kesumawati Yanti, Cristi Yuda Romdania yulianto, alim Yusma Sari, Nia Hana Zainuddin, M Said