Maimun Rizalihadi
Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala, Jl. Tgk. Syeh Abdul Rauf No. 7, Darussalam Banda Aceh 23111.

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A Preliminary Study on Rainfall Interception Loss and Water Yield Analysis on Arabica Coffee Plants in Central Aceh Regency, Indonesia Yulianur BC, Alfiansyah; Rizalihadi, Maimun; Benara, Reza
Aceh International Journal of Science and Technology Vol 1, No 3: December 2012
Publisher : Graduate Program of Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (258.257 KB) | DOI: 10.13170/aijst.1.3.137

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Abstract - Rainfall interception loss from plants or trees can reduce a net rainfall as source of water yield. The amount of rainfall interception loss depends on kinds of plants and hydro-meteorological characteristics. Therefore, it is important to study rainfall interception loss such as from Arabica Coffee plantation which is as main agricultural commodity for Central Aceh Regency. In this study, rainfall interception loss from Arabica Coffee plants was studied in Kebet Village of Central Aceh Regency, Indonesia from January 20 to March 9, 2011. Arabica coffee plants used in this study was 15 years old, height of 1.5 m and canopy of 4.567 m2. Rainfall interception loss was determined based on water balance approach of daily rainfall, throughfall, and stemflow data. Empirical regression equation between rainfall interception loss and rainfall were adopted as a model to estimate rainfall interception loss from Arabica Coffee plantation, which the coefficient of correlation, r is 0.98. In water yield analysis, this formula was applied and founded that Arabica Coffee plants intercept 76% of annual rainfall or it leaved over annual net rainfall 24% of annual rainfall. Using this net rainfall, water yield produced from Paya Bener River which is the catchment area covered by Arabica Coffee plantation was analyzed in a planning of water supply project for water needs domestic of 3 sub-districts in Central Aceh Regency. Based on increasing population until year of 2025, the results showed that the water yield will be not enough from year of 2015. However, if the catchment area is covered by forest, the water yield is still enough until year of 2025
POLA GERUSAN LOKAL AKIBAT PERLAKUAN PADA ABUTMEN JEMBATAN Shaskia, Nina; Rizalihadi, Maimun
JURNAL TEKNIK SIPIL Vol 8, No 2 (2019): Volume 8, Nomor 2, November 2019
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1078.953 KB) | DOI: 10.24815/jts.v8i2.14055

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Kegagalan struktur bangunan jembatan akibat gerusan lokal sangat sering terjadi. Oleh karena itu, perlu dilakukan pencegahan gerusan lokal agar struktur jembatan tetap aman. Salah satu penyebab terjadinya gerusan lokal adalah  terhalangnya aliran sungai akibat keberadaan abutmen jembatan. Terganggunya pola aliran sungai ini menyebabkan terjadinya gerusan di sekitar abutmen jembatan yang pada akhirnya dapat merusak keseluruhan struktur jembatan. Tujuan dari penelitian ini adalah untuk melihat perilaku gerusan lokal akibat perlakuan pada abutmen jembatan. Model abutmen yang digunakan pada penelitian ini adalah abutmen tipe vertical-wall dengan ukuran lebar 12 cm, tebal 4,5 cm, dan  tinggi 80 cm. Perlakuan pada abutmen dilakukan dengan menempatkan orifice dan dengan membelokkan abutmen dengan sudut 90°. Penelitian ini dilakukan dengan menggunakan flume dengan panjang 15,46 meter, lebar 0,50 meter dan tinggi 1,00 meter yang pada dasarnya diberi lapisan pasir setebal 10 cm dengan karakteristik d50 = 0,379 mm dan  sg = 2,786. Pengamatan dilakukan pada debit konstan 2,65 l/det selama 60 menit untuk setiap kali running dan diukur dengan menggunakan point gauge. Hasil penelitian menunjukkan bahwa perlakuan pada abutmen berpengaruh terhadap kedalaman dan distribusi gerusan yang terjadi. Akibat dibelokkan 90°, kedalaman gerusan pada titik 1, 3, dan 4 berturut-turut berkurang sebanyak 17,8 %, 20,5 %, dan 24,3 %; sedangkan akibat penempatan orifice, kedalaman gerusan pada titik 1, 3, dan 4 berturut-turut berkurang sebanyak 21,6 %, 24,3 %, dan 30,4 %.
Observasi Garis Freatis pada Model Bendungan Berdasarkan Kepadatan Tanah Melalui Model Fisik Azmeri, Azmeri; Rizalihadi, Maimun; Yanita, Irma
Jurnal Teknik Sipil Vol 20, No 1 (2013)
Publisher : Institut Teknologi Bandung

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Abstract

Abstrak. Kestabilan tubuh bendung tergantung pada besar kecilnya rembesan yang terjadi. Tujuan penelitian ini adalah untuk melihat dan mengamati pola aliran garis freatis yang terjadi pada tubuh bendungan serta menghitung debit rembesan yang dihasilkan. Penelitian ini menggunakan model tubuh bendungan yang terbuat dari tanah lempung kekuning-kuningan dengan memvariasikan tingkat kepadatan tanah sebesar 60%, 65%, dan 70%. Penelitian uji model menggunakan bejana kaca setebal 10 mm dengan panjang 180 cm, lebar 44 cm, dan tinggi 68 cm dengan skala 1 : 25 dari prototipenya. Penelitian ini memiliki 3 variasi tinggi air tampungan, yaitu 35 cm, 45 cm, dan 55 cm. Pola aliran rembesan ini dianalisis dengan menggunakan teori perhitungan aliran yaitu metode Dupuit, metode Schaffernak, dan metode Cassagrande. Pada penelitian ini, pada kondisi kepadatan tanah 60%, 65%, dan 70% hanya pada kondisi air tampungan 55 cm yang dapat memenuhi metode Cassagrande. Besar debit yang dihasilkan menurut perhitungan dan penelitian masing-masing untuk kepadatan 60%, 65%,70% adalah 6,015 x 10-6 cm3/det dan 8,07 x 10-6 cm3/det, 5,806 x 10-6 cm3/det dan 7,80 x 10-6 cm3/det, 5,372 x  10-6 cm3/det dan 7,21 x 10-6 cm3/det. Perbedaan debit dari hasil perhitungan dan penelitian menunjukkan kalibrasi pemodelan belum sempurna. Hasil yang didapat menunjukkan bahwa semakin tinggi tingkat kepadatan tanah pada tubuh bendungan maka semakin kecil debit rembesan yang dihasilkan. Abstract. Stability of dam depends on the size of the seepage that occurs. The purpose of this study was to see and observe flow pattern of phreatic line occurred on dam body and calculate the resulting seepage discharge. This study used a model dam body made of yellowish clay with varying soil density 60%, 65%, and 70%. Model test study used 10 mm thick glass vessel with a length of 180 cm, width of 44 cm, height of 68 cm with a 1:25 scale of prototype. This study had three height variations of water level, which is 35 cm, 45 cm, and 55 cm. Seepage flow pattern was analyzed by using flow computation theories, namely Dupuit, Schaffernak, and Cassagrande method. The discharge resulting from the calculation and physical modelling each soil density are for 60%, 65%, 70% was6,015 x 10-6 cm3/det and 8,07x10-6 cm3/det, 5,806 x 10-6 cm3/det and 7,80 x 10-6 cm3/det, 5,372 x 10-6 cm3/det and 7,21 x 10-6 cm3/det Differences in discharge from the calculation and studies indicated that the calibration models were not perfect. The results obtained show that the higher the density of the soil on the dam body, the smaller the resulting seepage discharges.
Hydrological Response Unit Analysis Using AVSWAT 2000 for Keuliling Reservoir Watershed, Aceh Province, Indonesia Azmeri, .; Yulianur, Alfian; Rizalihadi, Maimun; Bachtiar, Shafur
Aceh International Journal of Science and Technology Vol 4, No 1 (2015): April 2015
Publisher : Graduate Program of Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1040.432 KB) | DOI: 10.13170/aijst.4.1.2317

Abstract

Sediments deposition derived from the erosion in upstream areas can lead to river siltation or canals downstream irrigation. According to the complexity of erosion problem at Keuliling reservoir, it is essential that topography, hydrology, soil type and land use to be analyzed comprehensively. Software used to analyze is AVSWAT 2000 (Arc View Soil and Water Assessment Tools-2000), one of the additional tool of ArcView program. The results obtained are the watershed delineation map, soil type map to produce soil erodibility factor (K) which indicates the resistance of soil particles toward exfoliation, land use map to produce crop management factor (C) and soil conservation and its management factors (P). Hydrology analysis includes soil type, land use and utility for the erosion rate analysis through Hydrologic Response Unit (HRU). The biggest HRU value of sub-basin is on area 5 and the lowest one is on area 10. All four HRU in sub-basin area 5 are potentially donating high value for HRU. In short, this area has the longest slope length so that it has a large LS factor. About 50% of the land was covered by bushes which gain higher C factor rather than forest. Moreover, it has contour crop conservation technique with 9-20 % declivity resulting in having dominant factor of P. Soil type is dominated by Meucampli Formation which has soil erodibility factor with high level of vulnerable toward the rainfall kinetic energy. All in all, the vast majority of HRU parameters in this sub-basin area obtain the highest HRU value. Hydrology analysis, soil type, and use-land are useful for land area analysis that is susceptible to erosion which was identified through Hydrologic Response Unit (HRU) using GIS. As the matter of fact, spatially studies constructed with GIS can facilitate the agency to determine critical areas which are needed to be aware or fully rehabilitated.
Study the Efficiency of Irrigation in Rice Field Efforts to Increase Rice Yield in Irrigation Area Krueng Jrue Yanti, Rahmi Putri; Yulianur, Alfiansyah; Rizalihadi, Maimun
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering
Publisher : Syiah Kuala University

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Abstract

Irrigation water management problems will arise if there is a shortage of waterin rice fields. Shortage of water in rice fields can be evaluated by the efficiency of existing irrigation.Based on the Indonesian‟s irrigation design criteria 65%, the project efficiency for Irrigation Planning is 65%. This value when compared to some countries in Asia was still much greater. This might be caused by undeterminating the water losses in the rice field. The study aims to determine the efficiency of irrigation in rice fields (Field Application Efficiency) is actually through direct measurements in the field, started at the land preparation up to the growth of rice plants. Measurements were taken at one tertiary JKr21Kr in Krueng Jreue Irrigation Region. To evaluate the efficiency of irrigation in ricefields used two methods of measurement. Inflow-outflow method for measuring the delivery of irrigation water in rice fields (Vf) which use the modified pipes that serves as the entrance and exit of water in the tertiary, the difference between incoming water and outgoing water is the amount of water used in rice fields. Water balance in the field is measured using Drum technique method with a diameter of 50 cm and height 125 cm. The drums are planted in the ground and a quarter of the height of the drum located above thesurface. By this equipment, the evapotranspiration parameters, percolation and effective rainfall can be obtained. These results showthat the efficiency of irrigation in rice fields (Ea) of 65.29%. It means that actually the project efficiency is 42.44% far below than Indonesian‟s criteria.
PEMODELAN FISIK BENDUNGAN UNTUK PENGAMATAN GARIS FREATIS BERDASARKAN KEMIRINGAN LERENG SEBELAH HULU Azmeri, Azmeri; Rizalihadi, Maimun; Vinanda, Rima
JURNAL TEKNIK SIPIL Vol 3, No 1 (2013): Jurnal Teknik Sipil Volume 3, Nomor 1, September 2013
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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Abstract

Seepage problems that often appeared on a main-dam. The purpose of this study is to observe the flow pattern of phreatic line that occur on the dam body and to count the seepage discharge that come about. This research was conducted using the seepage body model that made from yellowish clay with 70 % levels of density and had 4,9 x 10-7 permeability values which variating upstream slope angle. The amount of upstream slope angle that variated was 41,15°, 46,29°, and 52,74°, whereas the downstream was 50,33°. This model test research utilized 10 mm thick glass vassel with 180 cm length, 44 cm width, and 68 cm high as well as 1 : 25 scale from the old researcher. This research had 3 high water catchment variations, those were 35 cm, 45 cm, and 55 cm. In this research, in the 41,15°, 46,29°, and 52,74° upstream slope angle, only in the 55 cm water catchment condition that meet Cassagrande Method. The amount of discharge produced from the calculation and physical modelling each for are for 41,15°, 46,29°, 52,74° was 6,01 x 10-6 cm3/det and 7,96 x 10-6 cm3/det, 5,37 x 10-6 cm3/det and 7,21 x 10-6 cm3/det, 5,81 x 10-6 cm3/det and 7,65 x 10-6 cm3/det. The discharge differenciation from the calculation result and the research showed that calibration modeling is not yet perfect. The result, obtaining from this study represented that the dam body condition accompanied by variating the upstream slope angle also affects the size of the seepage that occurs.
KALIBRASI METODE USLE DALAM ESTIMASI EROSI AKIBAT KEHADIRAN ALUR (RILL) PADA SUATU LAHAN YANG DITANAMI RUMPUT GAJAH (PENISETUM PURPUREUM) Rizalihadi, Maimun; Fatimah, Eldina; Nazia, Lia
JURNAL TEKNIK SIPIL Vol 1, No 2 (2012): Volume 1, Nomor 2, Januari 2012
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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Abstract

Abstract: Land and water is one of the major natural resource which has an important role for human life. Exploitation of Land use in catchment areas that do not correspond to its carrying capacity or ignore the rules of conservation of soil and water will cause the damage of the land. One of these is degradation due to erosion processes. Erosion can lead to loss of topsoil (top soil) and nutrient elements essential for plant growth. Continuous erosion will also lead to increased sediment transport in rivers or reservoirs that disrupt the capacity of land and water balance of river or reservoir.  At present, land erosion is estimated using USLE method. This method is only limited to the erosion in the form of sheet erosion. The purpose of this study is to determine the influence of rill density on the rate of soil erosion. The research was conducted at the Laboratory of Hidrotechnics, Faculty of Engineering, University of Syiah Kuala,  using test plots of 150 cm length, 80 cm width and 20 cm height planted with elephant grass (Penisetum purpureum). The intensity of the artificial rain was made using a rainfall simulator. Soil erosion is measured at each treatment slope (0o, 10o and 20o), the intensity of rainfall (37.5, 50 and 62.5 mm per 5 minute durations) and rill density (0; 1; 2; and 3 m/m2). The results indicate that increasing rill density can increase the soil erosion compare to USLE method. Therefore, it is necessary to enter the rill density coefficient in the equation when estimating erosion using USLE equation.Keywords : soil erosion, sheet erosion, rill density, USLE, MUSLE, Penisetum purpureum, Rainfall Simulator.Abstrak: Salah satu sumberdaya alam  yang mempunyai peranan penting bagi kehidupan manusia adalah tanah dan air. Penggunaan lahan di daerah tangkapan yang tidak sesuai dengan daya dukungnya atau mengabaikan kaidah-kaidah konservasi tanah dan air akan menyebabkan kerusakan dari lahan tersebut. Salah satu akibat yang ditimbulkan adalah degradasi lahan akibat proses erosi oleh air. Erosi dapat menyebabkan hilangnya tanah lapisan atas (top soil) dan unsur-unsur hara yang sangat penting bagi pertumbuhan tanaman. Erosi secara kontinyu juga akan menyebabkan peningkatan angkutan sedimen pada sungai atau waduk sehingga mengganggu daya dukung tanah dan keseimbangan air disungai atau waduk. Selama ini untuk memperkirakan erosi lahan digunakan metode USLE. Metoda ini hanya terbatas pada erosi dalam bentuk lembar (sheet erosion). Tujuan dari penelitian ini adalah untuk mengetahui sejauh mana pengaruh kehadiran alur (rill) terhadap laju erosi lahan. Penelitian ini dilakukan di Laboratorium Hidroteknik, Fakultas Teknik Universitas Syiah Kuala dengan menggunakan plot uji dengan ukuran: panjang 150 cm x lebar 80 cm x tinggi 20 cm yang ditanami rumput gajah (Penisetum purpureum). Intensitas hujan buatan dibuat dengan menggunakan alat rainfall simulator. Erosi lahan diukur pada setiap perlakuan kemiringan lahan (00, 10o dan 20o), intensitas hujan (37,5; 50; dan 62,5 mm dengan durasi hujan selama 5 menit) dan kerapatan alur (0; 1; 2; dan 3 m/m2). Hasil penelitian menunjukkan bahwa erosi lahan mengalami peningkatan dengan meningkatnya kerapatan alur jika dibandingkan dengan estimasi USLE. Untuk itu, maka diperlukan untuk memasukkan koefisien kerapatan alur pada saat mengestimasi erosi dengan persamaan USLE.Kata kunci : erosi lahan, sheet erossion, rill, USLE, Penisetum purpureum, Rainfall Simulator.
ANALISA EFISIENSI JARINGAN IRIGASI DAERAH IRIGASI PANDRAH KABUPATEN BIREUEN Rizalihadi, Maimun; Fauzi, Amir; Tanzil, Reza
JURNAL TEKNIK SIPIL Vol 1, No 3 (2012): Volume 1, Nomor 2, Mei 2012
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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Abstract

Abstract: Irrigation efficiency is the number ratio of the  amountof irrigation water is used for the real needs of plant growth with the amount of water out from intake. Irrigation efficiency assumption based portion of the amount of water taken will be lost either on canals or in the rice fields. Values of irrigation efficiency specified in the plan is too high so that the implementation of the water provided is not enough given to areas downstream. The research was conducted at the Main Canals Right Pandrah until tertiary canals PKN3 T1 at Regional Irrigation District Pandrah Bireun is by measuring inflow and outflowthe canals by using current meter, to measure by using class A pan evaporation while the seepage measurement by the method of ponding. From the research results will be obtained efficiency will be obtained efficiency value of 87.50% of primary canals, secondary canals of 80.01% and 76.13% for the tertiary canals to obtain the value of the efficiency of irrigation system in the Canals Main Right Pandrah of 50.30%. Value efficiency ebove shows that there has been a shortage of 11.70% of the value of the efficiency plan by 65%. Water loss was causwd by the canals that has been broken, illegal tapping along the canals, domestic household use, complementary building of irrigation and evaporation. Need for reconsideration of the discharge plan taking on the intake for the distribution of irrigation water shall be adjusted to the actual value of efficiency in the field.Keywords : irrigation efficiency, water loss, evaporation, seepageAbstrak: Efisiensi irigasi adalah angka perbandingan dari jumlah air irigasi nyata yang terpakai untuk kebutuhan pertumbuhan tanaman dengan jumlah air yang keluar dari pintu pengambilan (intake). Efisiensi irigasi didasarkan asumsi sebagian dari jumlah air yang diambil akan hilang baik di saluran maupun di petak sawah. Nilai efisiensi irigasi yang digunakan di Indonesia selama ini ternyata jauh lebih besar dari beberapa negara di Asia. Inilah permasalahan yang menyebabkan kemungkinan kegagalan dari proyek yang ada di daerah kita dimana nilai efisiensi irigasi yang ditetapkan dalam perencanaan terlalu tinggi sehingga pada pelaksanaan air yang diberikan tidak cukup diberikan pada daerah hilir. Penelitian ini dilakukan di Saluran Induk Pandrah Kanan sampai dengan saluran tersier Pkn. 3 T1 pada Daerah Irigasi Pandrah yaitu dengan mengukur debit masuk dan debit keluar pada saluran dengan menggunakan alat pengukur kecepatan arus (current meter), untuk mengukur evaporasi dengan menggunakan panci evaporasi kelas A sedangkan pengukuran rembesan dilakukan dengan metode teknik Ponding. Dari hasil penelitian akan diperoleh nilai efisiensi saluran primer sebesar 87,50%, saluran sekunder sebesar 80,01% dan saluran tersier sebesar 76,13% sehingga diperoleh nilai efisiensi jaringan irigasi pada Saluran Induk Pandrah Kanan sampai dengan saluran tersier Pkn. 3 T1 sebesar 50,30%. Nilai efisiensi di atas menunjukkan bahwa telah terjadi kekurangan sebesar 11,70% dari nilai efisiensi rencana sebesar 65%. Kehilangan air tersebut disebabkan karena saluran yang telah mengalami kerusakan, adanya sadap-sadap liar disepanjang saluran, penggunaan domestik rumah tangga, bangunan pelengkap irigasi dan evaporasi. Perlu adanya peninjauan kembali terhadap debit rencana di pintu pengambilan (intake) untuk pembagian air irigasi agar disesuaikan dengan nilai efisiensi aktual di lapangan.Kata kunci : efisiensi jaringan irigasi, kehilangan air, evaporasi, rembesan.
STUDI EFISIENSI IRIGASI PADA PETAK SAWAH DALAM UPAYA PENINGKATAN HASIL PADI DI DAERAH IRIGASI KRUENG JREUE Yanti, Rahmi Putri; Yulianur, Alfiansyah; Rizalihadi, Maimun
JURNAL TEKNIK SIPIL Vol 2, No 1 (2012): Volume 2, Nomor 1, September 2012
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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Abstract

Abstract: Indonesia based on the value of irrigation efficiency standards by 65% Irrigation Planning. This value when compared to some countries in Asia were still much greater because of the efficiency of existing irrigation network was limited in that it needs to be revisited until the value of the efficiency of irrigation fields. This study aims to determine the efficiency of irrigation in rice fieldsis actually through direct measurements in the field. Measurements were taken at one tertiary JKr21Kr Krueng Jreue Regional Irrigation. To evaluate the efficiency of irrigation in rice fields used two methods of measurement. Inflow-outflow method for measuring the delivery of irrigation water in rice fields (Vf) which use the modified pipes that serves as the entrance and exit of water in the tertiary, the difference between incoming water and outgoing water is the amount of water used in rice fields. Drum technique method for measuring the water demand of rice in rice fields (Vm), the use of 3 (three) drum with a diameter of 50 cm and height 125 cm. Drum serves to measure the evapotranspiration parameters, percolation and effective rainfall. These results indicate the efficiency of irrigation in rice fields (Ea) of 59.57%. The study recommends irrigation efficiency based on the Standard Planning Irrigation needs to be calculated up to the fields, so that the obtained value of 38.72% irrigation efficiency and irrigation efficiency by planning to be at 40.68%. The value of irrigation efficiency can be improved by carrying out repairs and maintenance on the rice field to prevent seepage and an awareness of attitudes and behaviors of farmers in irrigation water use, so the addition of land area is made possibleKeywords : Evapotranspiration, percolation, water discharge, drum technique, inflow-outflow.Abstrak: Indonesia nilai efisiensi irigasi berdasarkan Standar Perencanaan Irigasi sebesar 65%. Nilai ini bila dibandingkan dengan beberapa negara di Asia ternyata masih jauh lebih besar karena nilai efisiensi irigasi yang ada hanya sebatas di jaringan sehingga perlu ditinjau kembali nilai efisiensi irigasi sampai ke petak sawah. Penelitian ini bertujuan untuk mengetahui nilai efisiensi irigasi pada petak sawah yang sebenarnya melalui pengukuran langsung di lapangan.. Pengukuran dilakukan pada salah satu petak tersier JKr21Kr  di Daerah Irigasi Krueng Jreue. Untuk mengevaluasi nilai efisiensi irigasi pada petak sawah digunakan dua metode pengukuran. Metode inflow-outflow untuk mengukur pemberian air irigasi pada petak sawah (Vf) dimana menggunakan pipa paralon yang berfungsi sebagai pintu masuk dan pintu keluar air pada petak tersier, selisih antara air yang masuk dan air keluar merupakan jumlah air yang digunakan pada petak sawah. Metode teknik drum padi untuk mengukur kebutuhan air di petak sawah (Vm), menggunakan 3 (tiga) buah drum dengan diameter 50 cm dan tinggi 125 cm. Drum ini berfungsi untuk mengukur parameter evapotranspirasi, perkolasi dan curah hujan efektif. Hasil penelitian ini menunjukan nilai efisiensi irigasi pada petak sawah (Ea) sebesar 59.57%. Hasil penelitian merekomendasikan efisiensi irigasi berdasarkan Standar Perencanaan Irigasi perlu diperhitungkan sampai ke petak sawah, sehingga di peroleh nilai efisiensi irigasi sebesar 38.72% dan efisiensi irigasi berdasarkan perencanaan menjadi sebesar 40.68%. Nilai efisiensi irigasi ini dapat ditingkatkan dengan cara melakukan perbaikan dan pemeliharaan pada pematang sawah agar tidak terjadi rembesan serta adanya kesadaran  sikap dan perilaku petani dalam penggunaan air irigasi, sehingga penambahan luas lahan sangat dimungkinkan terjadi.Kata kunci : Evapotranspirasi, perkolasi, debit air, teknik drum, inflow-outflow.
PENGARUH EROSI LAHAN TERHADAP ANGKUTAN SEDIMEN MELAYANG KECAMATAN LHOONG KABUPATEN ACEH BESAR Rizalihadi, Maimun; Iqbal, Khairul; Indra, Juan
JURNAL TEKNIK SIPIL Vol 3, No 2 (2014): Volume 3, Nomor 2, Januari 2014
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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Abstract

The existence of Montara river is very crucial because it is the main source of irigation in Lhoong Subdistrict.  One of concerns that worhtly can be discussed in Montara river is the level of soil erotion. Erotion and sedimentaion study are done on July through August for a month or 10 days of rain (thoose that reached the first will be selected) he calculation of erotion used the USLE equation, while study about sediment in Krueng Montara Basin is narrowed only for suspended load. The results of this study are the amount of land erotion and the suspended load discharge in some rainfalls, the correlation between both of them is determined into some  regression models namely linear regression, power regression and exponential regression. The result shows that the power regression model is  the best model of all which has a formula as Qs = 6,7953 A1,8791 with R² = 0,8786 or 87 % and close to 1, it means this model can be used to predict the suspended load discharge by knowing the amount of land erossion and also the reverse. Besides using regression model, the relationship between land erossion (A) and  suspended load (Qs) s determined by calculating the suspended load ratio. Based on calculation, the average ratio of suspend load (Qs) in Krueng Montara basin is 0,00233.