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All Journal Jurnal Perikanan dan Kelautan Jurnal Teknik Pengairan: Journal of Water Resources Engineering Jurnal Ilmiah Setrum
WAHYU FIRMANSYAH
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Education Engineering Environmental Science Immunology & microbiology Social Sciences

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Analisa Metode Kagan-Rodda Terhadap Analisa Hujan Rata-Rata dalam Menentukan Debit Banjir Rancangan dan Pola Sebaran Stasiun Hujan di Sub DAS Amprong Dermawan, Very; Hoesein, Abdul Azis; Firmansyah, Wahyu
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 1, No 2 (2010)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (660.854 KB)

Abstract

Pada perencanaan jaringan Kagan-Rodda berdasarkan data curah hujan rata-rata harian maksimum daerah dari metode Rata-rata hitung untuk tingkat kesalahan perataan (Z1) 5% didapatkan 4 buah stasiun hujan terpilih dari 8 buah stasiun hujan pada kondisi eksisting. Sedangkan pada perencanaan jaringan Kagan-Rodda berdasarkan data curah hujan rata-rata harian maksimum daerah dari metode Poligon Thiessen untuk tingkat kesalahan perataan (Z1) 5% didapatkan 4 buah stasiun hujan terpilih dari 8 stasiun hujan pada kondisi eksisting. Metode Rata-rata hitung mengahasilkan kesalahan relatif untuk setiap kala ulang tertentu adalah lebih kecil dari 5%, yaitu 1.12% - 4.49% . Dengan besarnya curah hujan rancangan tersebut dapat dihitung besarnya debit banjir rancangan dengan metode HSS Snyder sehingga diperoleh banjir rancangan yang terjadi antara 1009.00 m3 – 2001.60 m3 untuk setiap kala ulang tertentu. Sedangkan metode Poligon Thiessen menghasilkan kesalahan relatif untuk setiap kala ulang tertentu lebih kecil dari 5% yaitu antara 1.42% -4.68%. Sehingga dengan curah hujan rancangan tersebut pula dapat dihitung besarnya debit banjir rancangan dengan metode HSS Snyder sebesar 911.14 m3 –1806.90 m3 untuk setiap kala ulang tertentu. Dengan demikian dapat disimpulkan bahwa untuk perencanaan jaringan Kagan Rodda di daerah studi, kedua metode ini bisa digunakan. Meskipun metode Rata-rata hitung memberikan hasil yang lebih baik daripada metode Poligon Thiessen, yaitu terlihat dari rata-rata besarnya kesalahan relatif yang terjadi. Besarnya kesalahan relatif untuk metode Rata-rata hitung adalah sebesar 3.0%, sedangkan kesalahan relatif untuk metode Poligon Thiessen adalah sebesar 3.6%.Kata Kunci: Analisa Metode Eksisting, Analisa Metode Kagan-Rodda, PolaPenyebaran Stasiun Hujan.
The Effect of Different Size Recirculation Systems on the Quality of Water in Tilapia (Oreochromis niloticus) Culture Firmansyah, Wahyu; Cokrowati, Nunik; Scabra, Andre Rachmat
Jurnal Perikanan dan Kelautan Vol 26, No 2 (2021)
Publisher : Fakultas Perikanan dan Kelautan Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jpk.26.2.85-93

Abstract

This study aims to analyze the effect of different cross-sectional areas of recirculation systems on water quality in tilapia (Oreochromis niloticus) rearing. The method used is an experimental method with a completely randomized design (CRD), 4 treatments and 3 replications each. The treatments are P0 (conventional), P1 (2 cross-sectional units with an area of 1,087 cm2), P2 (4 section units with an area of 2,174 cm2), P3 (6 section units with an area of 3,261 cm2). Each treatment used the same filter, namely cotton, zeolite, pumice stone, and bio balls. The results of the research the highest absolute weight growth was obtained in the P3 treatment with an average value of 4.56 g and followed respectively P2 4.38 g, P2 3.03, P0 2.59 g. The highest absolute length growth rate was obtained in treatment P3 2.71 cm, P2 of 2.54 cm, P1 of 1.87 cm, and the lowest absolute length was found in treatment P0 of 1.62 cm. The highest feed conversion value was at P0 at 3.91, followed by P1 at 2.84, P2 at 2.06, and the lowest at P3 at 1.94. The highest survival value was P3 of 85.00, P2 r 83.33, P1 73.33 and the lowest was P0 of 55.00. The highest diversity coefficient value was obtained in treatment P0 of 17.58, followed respectively by treatment P1 of 16.05, P2 of 12.91 and the lowest coefficient of diversity found in treatment P3 of 12.69. The conclusion of this study is the use of different recirculation cross-sectional areas has a significant effect on absolute weight growth, absolute length growth, feed conversion ratio, survival, and water quality. The recirculation cross-sectional area in P3 treatment with a cross-sectional area of 3.261 cm2 gave good results for the survival of tilapia (O. niloticus).
Hidrolisis Limbah Tongkol Jagung Menggunakan Asam Sulfat Dengan Variasi Waktu Fermentasi Ellysa Loviani; Nani Sofroh; Wahyu Firmansyah; Andri Kapuji
Setrum : Sistem Kendali-Tenaga-elektronika-telekomunikasi-komputer Vol 7, No 2 (2018): Edisi Desember 2018
Publisher : Fakultas Teknik Elektro - Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/setrum.v7i2.4516

Abstract

the Indonesian people and the world in general. This problem has triggered exploration of alternative materials that can be used as substitute fuels for fuel oil. Corn cobs are one of the alternative ingredients that can be converted into liquid fuels. Corn cobs which are hydrolyzed to produce glucose are then fermented to produce ethanol. This research carried out the hydrolysis step against corncob to become glucose so that it can be fermented into liquid fuel in the form of ethanol in the next stage. Hydrolysis is carried out using sulfuric acid. The results showed that from as much as 10 grams of dried corn cobs were crushed then oven for 4 hours at a temperature of 60oC then added 100 mL of sulfuric acid solution in various normalities. Hydrolysis is run at a temperature of 100 Oc, the results of hydrolysis are analyzed at various time variations. The results of the trial showed hydrolysis using sulfuric acid with a variation of time can convert corncob into glucose ± 54 mL.
Co-Authors Abdul Azis Hoesein Andre Rachmat Scabra Andri Kapuji Ellysa Loviani Nani Sofroh Nunik Cokrowati Very Dermawan