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RASIONALISASI JARINGAN STASIUN HUJAN MENGGUNAKAN METODE KAGAN – RODDA DENGAN MEMPERHITUNGKAN FAKTOR TOPOGRAFI PADA DAERAH ALIRAN SUNGAI (DAS) SAMPEAN, KABUPATEN BONDOWOSO, JAWA TIMUR Adihaningrum, Anita Andriyani; Dermawan, Very; Chandrasasi, Dian
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 1, No 2 (2018)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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DAS Sampean saat ini mempunyai 34 stasiun dengan sebaran yang tidak merata dan kurang efektif dalam pemeliharaan. Oleh karena itu diperlukan kajian rasionalisasi stasiun hujan di DAS Sampean dengan luas 1.244,18 km2. Hasil analisa rasionalisasi stasiun hujan metode Kagan-Rodda berdasarkan data curah hujan rata-rata harian maksimum daerah dari metode Poligon Thiessen, didapatkan jumlah ideal stasiun hujan sesuai standar WMO (World Meteorological Organization) adalah 12 buah stasiun hujan dengan nilai kesalahan perataan (Z1) sebesar 9,1 % dan nilai kesalahan interpolasi (Z3) sebesar 19,4%. Faktor topografi (elevasi, jarak, kemiringan) yang mempunyai hubungan yang paling kuat adalah elevasi dengan koefisien determinasi (R2) sebesar 0,517 atau mempunyai pengaruh sebesar 51,7%, sisanya dipengaruhi oleh faktor lain yang tidak diteliti seperti garis lintang, arah angin, suhu, hubungan dengan deretan gunung, dan relief. Sedangkan hubungan antara parameter topografi yang mempunyai hubungan paling kuat adalah elevasi terhadap jarak dengan koefisien determinasi (R2) sebesar 0,493 atau mempunyai pengaruh 49,3%. Kata Kunci: rasionalisasi, standar WMO, Kagan-Rodda, faktor topografi Sampean Watershed currently has 34 rain gauges with uneven distribution and less effective in maintenance. Therefore, it is necessary to study rationalization of rain gauges in Sampean Watershed with an area of 1,244.18 km2. Result of rationalization analysis of rain gauges by Kagan - Rodda method based on precipitation data daily average maximum area from Thiessen Polygon method, got the ideal number of rain gauges according to WMO standard is 12 pieces of rain gauges with the value of relative root mean error (Z1) is 9.1% and the value of interpolation error (Z3) is 19.4%. Topographic factors (elevation, distance, slope) that have the strongest relationship is elevation with the coefficient of determination (R2) of 0.517 or has the effect is 51.7%, the rest is influenced by other factors not examined such like latitude, wind direction, temperature, relationship with rows of mountains, and reliefs. While the relationship between topographic parameters that have the strongest relationship is elevation to the distance with the coefficient of determination (R2) of 0.493 or has the effect is 49.3%. Keywords: rationalization, WMO standard, Kagan-Rodda, topography factors

KAJIAN PERBANDINGAN METODE PERHITUNGAN INTENSITAS HUJAN YANG SESUAI DI LINGKUNGAN UNIVERSITAS BRAWIJAYA, MALANG Puspasari, Ria; Harisuseno, Donny; Chandrasasi, Dian
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 2, No 1 (2018)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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ABSTRAK : Intensitas hujan yang terjadi di wilayah Kota Malang cukup tinggi dan sering kali menyebabkan genangan termasuk di Area Universitas Brawijaya. Studi ini dilakukan untuk memperoleh metode perhitungan intensitas hujan yang sesuai di Wilayah Universitas Brawijaya Malang dengan membandingkan data intensitas hujan pengamatan yang diperoleh dari penakar hujan otomatis atau ARR (Automatic Rainfall Recorder) yang berada di Laboratorium Hidrologi Teknik Pengairan dengan metode Talbot, Sherman, Ishiguro dan Mononobe. Menurut hasil analisa perbandingan yang dilakukan antara Metode Talbot, Sherman, Ishiguro dan Mononobe didapatkan hasil yang paling baik dan sesuai dengan karakteristik wilayah Universitas Brawijaya adalah Metode Sherman. Dengan nilai deviasi rata-rata terkecil yaitu 0,335, kemudian Kesalahan Relatif (%) rata-rata 12,449%, dan juga Koefisien Efisiensi Nash-Sutcliffe rata-rata sebesar 0,928. Kurva IDF (Intensitas-Durasi-Frekuensi) Metode Sherman menunjukkan kecocokan untuk memprediksi Intensitas hujan yang sesuai dengan karakteristik wilayah Universitas Brawijaya yang digunakan untuk perhitungan limpasan (Run-Off) dengan rumus rasional dan perhitungan debit puncak yang berfungsi dalam perencanaan bangunan air. Kata kunci: Intensitas hujan, Talbot, Sherman, Ishiguro, Mononobe, Kurva IDF ABSTRACT : The Rainfall intensity in Malang Area is quite high and it usually causing run-off including at University of Brawijaya Area. This comparation study was conducted to obtain the appropriate rainfall intensity calculation method at University of Brawijaya Area by comparing Talbot, Sherman, Ishiguro and Mononobe method with the observation rainfall intensity data from ARR (Automatic Rainfall Recorder) that located in the Water Resources Engineering Hydrology Laboratory. According to the results of the analysis between the Talbot, Sherman, Ishiguro and Mononobe methods, the best results that appropriate with the University of Brawijaya area characteristics are Sherman Method. With the smallest average deviation value 0.335, Relative Error (%) averaged 12.449%, and Nash-Sutcliffe Efficiency Coefficient average 0.928. The IDF Curve (Intensity-Duration-Frequency) of Sherman Method shows the suitability to predict the rainfall that appropriate with the University of Brawijaya area characteristics which is used to calculate the run-off with rational formula and for calculating the peak discharge that functioned for water structure planning. Keywords: Rainfall Intensity, Talbot, Sherman, Ishiguro, Mononobe, IDF curve.

Model-Model Pembangkitan Data Sintetis Untuk Curah Hujan Harian Di Wilayah Brantas Tengah Soetopo, Widandi; Limantara, Lily Montarcih; Sayekti, Rini Wahyu; Purwati, Endang; Chandrasasi, Dian; Ilham, Muhammad; Rahmadi, Agung
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 4, No 1 (2013)
Publisher : Fakultas Teknik, Universitas Brawijaya

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This research is for finding the suitable the synthetic data generating model for daily rainfall in the region of Middle Brantas River Basin in the East Java Province. There are 7 models being considered, 4 models for single-site generation, (1) the two-part, model group, (2) the transition probability matrix model group, (3) the resampling model group, and (4) the time series model group, and 3 models for multisite generation, (5) the conditional, model group, (6) the extension of single site Markov chain model group, and (7) the random cascade model group. All of the time-series produced by the daily rainfall synthetic data generation are then tested statistically. The results show that statistically the differences between the historical time series and the synthetically time series are not too significant. It turn out that the multisite model have produced better synthetic time series compared to those which have been produced by the single-site models.Keywords: generating model, synthetic data, daily rainfall.

Studi Efektifitas Dan Kinerja Instalasi Pengolahan Air Limbah (Ipal) Pada Peternakan Sapi Skala Rumah Tangga Bintang, Yunita Kusuma; Chandrasasi, Dian; Haribowo, Riyanto
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 10, No 1 (2019)
Publisher : Fakultas Teknik, Universitas Brawijaya

Argosari Village is one of the villages that has cattle farms in Malang Regency. This research was conducted in one of the houses in Argosari Village and has 6 (six) of cows. In one day, each cow produces 100-150 liters of liquid waste. However, the liquid waste is immediately discharged into the drainage channel because there is no effort to process wastewater. On the results of laboratory tests, samples of wastewater, BOD, COD, TSS, NH3-N and pH in wastewater were respectively 4488 mg/L, 11000 mg/L, 850,5 mg/L, 479,3 mg/L, 8,5 mg/L. Based on the Regulation of the Minister of Environment Number 11 of 2009, the liquid waste has not met the quality standard. Wastewater Treatment Plant (WWTP) is needed to save reserves on cattle wastewater. The suitable installation in this condition is an initial settling basin, aerobic biofilter basin and a final settling basin. Aerobic biofilter is used so that liquid waste can be used biologically by using the media of honeycomb biofilter to grow and breed microorganisms. After processing the WWTP, there is a decrease in effluent, so WWTP can produce effluent BOD of 80,78 mg/L, COD = 198 mg/L, TSS = 5,10 mg/L, NH3-N = 23,9 mg/L and pH = 8,5.

Perubahan Desain Dengan Uji Model Fisik Bendung Gerak Karangnongko Tahap I, Sungai Bengawan Solo Hilir Kabupaten Bojonegoro Dan Blora Chandrasasi, Dian; Priyantoro, Dwi
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 6, No 1 (2015)
Publisher : Fakultas Teknik, Universitas Brawijaya

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The purpose of the investigation of the physical model of Karangnongko barrage Phase I is to study the hydraulics flow conditions in the river due to the influence of the barrage and to determine the capacity of the gate to control and regulate the flow rate during the dry and rainy seasons. While the objectives of this investigation hydraulics physical model is to provide suggestions for improvements of design and recommendations of design in terms of hydraulics aspects of Karangnongko barrage. Three important points that obtained from the results of testing and analysis are as follows: On each gate opening operation does not cause symptoms of vortex and directions distribution of equitable velocity both upstream and downstream of the gates; Does not occur overtopping on the upstream of barrage when the flowing of discharge Q PMF and PMF REGIONAL , because the highest water level in the barrage upstream on +41.00 and +37.30 in the river downstream when the gate is fully opened; To avoid the vortex flow in the stilling basin it is recommended that operate 9 units barrage gate with openings evenly. With details of water level in the upstream +38.00 at the beginning of the rainy season, +40.00 during the dry season, and +41.00 during the flood discharge.Key words: Karangnongko barrage dam, the physical model test, design change.

Model-Model Pembangkitan Data Sintetis Untuk Curah Hujan Harian Di Wilayah Brantas Tengah Soetopo, Widandi; Limantara, Lily Montarcih; Sayekti, Rini Wahyu; Purwati, Endang; Chandrasasi, Dian; Ilham, Muhammad; Rahmadi, Agung
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 6, No 1 (2015)
Publisher : Fakultas Teknik, Universitas Brawijaya

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This research is for finding the suitable synthetic daily rainfall generating model in the Middle Brantas River Basin - East Java. There are 7 models being considered, 4 single-site models, (1) the two-part, (2) the transition probability matrix, (3) the resampling, and (4) the time series, and 3 multisite models, (5) the conditional, (6) the extension of single site Markov chain, and (7) the random cascade. All time-series produced by the models are then tested statistically. The results show that the differences between the historial time series and the synthetical time series are not too significant. It turn out that the synthetic time series of multisite models are better than the synthetic time series of single-site models.Keywords: generating model, synthetic data, daily rainfall.

PENERAPAN METODE GEOLISTRIK KONFIGURASI WENNER â€“ SCHLUMBERGER UNTUK ANALISIS REMBESAN PADA MAINDAM WADUK GRENENG, KABUPATEN BLORA Chandrasasi, Dian; Asmaranto, Runi; Partarini, Ni Made Candra
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 9, No 2 (2018)
Publisher : Fakultas Teknik, Universitas Brawijaya

The nearly 100-year-old Greneng dam is indicated by seepage in the main dam visible from landslides on the downstream of the dam wall. This study aims to determine visible seepage in the main dam of Greneng Dam and to find out the position of seepage pattern on the body slope and foundation of Greneng Dam by Electrical Geology configuration of Wenner-Schlumberger. Visually there are 6 (six) spot seepage where, one spot of seepage is suspected as a result of groundwater flow. The indication of the seepage position is entirely located on the downstream of the main dam. The measurement result by Electrical Geology configuration of Wenner-Schlumberger with the processing of RES2DINV application obtained the result of seepage position which is represented by the lowest resistivity value with blue gradation. The results of the four work lines can be observed that each line shows the potential for different seepage, however, it can be seen that there is a potential flow of seepage in each area of Main Dam Greneng Dam which is characterized by low resistivity marked with blue color.

perencanaan Instalasi Pengolahan Air (IPA) wudhu dengan mengggunakan alat filter sederhana di lingkungan SMP Negeri 6 Malang Juziwijaya, Dudiman; Chandrasasi, Dian; Prayogo, Tri Budi
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 2, No 2 (2019)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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Limbah dari air wudhu putera di Masjid Al-Hidayah SMP Negeri 6 Malang tidak dimanfaatkan kembali, hal tersebut disebabkan tidak adanya instalasi pengolahan air. Tujuan dari penelitian ini adalah mengetahui kualitas air dari limbah wudhu, besar debit yang dihasilkan oleh alat filter sederhana, efisiensi penurunan alternatif alat filter sederhana antara Alternatif I (ketebalan pasir silika 70 cm dan ketebalan zeolit 30 cm), Alternatif II (ketebalan pasir silika 65 cm dan ketebalan zeolit 35 cm) dan Alternatif III (ketebalan pasir silika 60 cm dan ketebalan zeolit 40 cm) dan mengetahui efisiensi terbesar dari ketiga alternatif untuk memenuhi standar baku mutu air kelas I. Dari hasil uji kualitas air limbah air wudhu terdapat dua parameter yang tidak memenuhi standar,Yaitu BOD dan COD. Debit yang dihasilkan oleh alat filter sederhana Alternatif I 340.48 lt/jam, Alternatif II 359.041 lt/jam dan Alternatif III 377.62 lt/jam. efisiensi media filter untuk menurunkan dan menaikan nilai parameter dikelompokkan tidak efektif. Dari hasil analisa nilai efisiensi terbesar didapatkan alternatif I yaitu Chemical Oxygen Demand (COD) 22,57 % ,Dissolved Oxygen (DO) 5,86% , pH 7,50 % ,dan ammonia (NH3) 11,83%.

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