Civil and Environmental Engineering

Cisadane River flows through ± 140 km, from Pangrango Mt. to Jawa Sea, with catchment area about 7,679.3 Ha. Cisadane River is used by local community to fulfill their daily need. Development of community activities along the river will influence the quality of water and river environment. The change of water quality and also the hydrological pattern will change the community structure of aquatic biota, such as periphyton. The aim of this research is to determine the quality of upstream of Cisadane River, based on community structure of periphyton and physico-chemicals of water quality. The observation was held monthly from ± 600 m usl). NSF-Water Quality Index was used to indicate the water quality physico-chemically, while saprobity classification and saprobity indices were used to evaluate the water quality biologically. The result show the physico-chemical and biological based evaluation. It is showed that the physico-chemical water quality of upstream Cisadane River is still in good condition. The 62 genera of periphyton community from the classes of Bacillariophyceae, Chlorophyceae, and Cyanophyceae, and Protozoa show that the river has low input of organic and inorganic materials.

Cidanau River flows from Rawa Danau swamp, collecting water in Cidanau watershed, and out from the watershed at a waterfall, Cirug Betung. At the exit from the watershed, excavation of a channel, completed in 1940s, has lowered water level upstream. We investigated water levels and their fluctuations in the swamp by conducting a land survey and leveling, and by installing water level sensors. Water flow models that control the water levels in the swamp and at the exit are also considered and applied. Based on the observations and the hydraulic models, present water level change, water level difference between at present and in the past, the effects of water storage in the swamp on both draught and flood discharges are calculated and discussed.

As the breeding place for chickens (broilers), a chicken cage should be appropriately designed in order to expect high productivity in meat production. closed house system is used  as an alternative for breeding chickens (broilers). The principles of a closed house are to provide sufficient oxygen to the chickens and to immediately remove dangerous gases such as carbon monoxide and ammonia. One of the most important matter on the use of a closed house is how to analyze the flow of these dangerous gases, especially ammonia. Therefore, simulations are needed to determine the flow pattern of ammonia which then can be used as a basis for the design and management of the cage.
The objective of this simulation is to analyze the flow pattern of ammonia in a closed house. This simulation is done using the Solidworks 2007 software which is equipped with cosmosfloworks that is used to analyze the flow with the CFD (Computational Fluid Dynamics) program. From the simulation results, it was found that ammonia flow pattern tends to spread evenly, especially in the middle section of the cage. The amount of ammonia decreases with height, meaning that the higher the location, the less amount of ammonia reside. The average amount of ammonia in a simulated closed house is 1.88664 ppm. This shows that the ammonia is being lifted out of the closed house, meaning that the condition in the closed house can be considered safe as a habitat for chickens.

Key word: Closed House, Ammonia ,Simulation

Abstrak: Salah satu permasalahan sumber daya air akibat aktivitas manusia adalah pencemaran badan air oleh limbah. Pemahaman mengenai aliran dan transpor pencemar dalam air tanah tidak mudah didapatkan. Untuk itu diperlukan adanya model yang dapat menyederhanakan kejadian dalam sistem air tanah terutama akibat adanya pengaruh difusi molekular dan adveksi. Praktikum ini bertujuan untuk mempelajari perhitungan dispersi larutan dalam aquifer, mempelajari dispersi larutan dalam aquifer, dan membuat spreadsheet untuk perhitungan dispersi dengan menggunakan model perhitungan Visual basic. Menurut Badient, Rifai dan Newell (1994), mekanisme transpor pencemar yang menjadi perhatian utama pada pembahasan air tanah adalah adveksi, dispersi, adsorpsi, biodeegradasi, dan reaksi kimia. Perhitungan besarnya dispersi larutan pencemar dilakukan dengan bahasa pemograman Visual Basic di MS. Excel. Setelah nilai pada tabel 1 dimasukkan kedalam persamaan kemudian didapat nilai seperti pada tabel 2, nilai tersebut di plotkan kedalam grafik. Dari grafik 1 tersebut terlihat semakin lama waktu koefisien dispersi semakin besar nilai yang didapat terhadap jarak. Kata Kunci: air tanah, aquifer, koefisien dispersi Abstract :

Jurnal Teknik Pertanian (J-TEP) merupakan publikasi ilmiah yang memuat hasil-hasil penelitian, pengembangan, kajian atau gagasan dalam bidang keteknikan pertanian. Lingkup penulisan karya ilmiah dalam jurnal ini antara lain: rekayasa sumber daya air dan lahan, bangunan dan lingkungan pertanian, rekayasa bioproses dan penanganan pasca panen, daya dan alat mesin pertanian, energi terbarukan, dan system kendali dan kecerdasan buatan dalam bidang pertanian. Mulai tahun 2019, J-TEP terbit sebanyak 4 (empat) kali dalam setahun pada bulan Maret, Juni, September, dan Desember. Sejak tahun 2018, J-TEP mendapatkan terakreditasi SINTA 3 berdasarkan SK Dirjen Dikti No.21/E/KPT/2018. J-TEP terbuka untuk umum, peneliti, mahasiswa, praktisi, dan pemerhati dalam dunia keteknikan pertanian.

Intrusion of sea water is the infiltration of sea water into the soil. This might be caused by a groundwater excessive exploration. Tangerang District is one of the areas that have great potential sea water intrusion. The aim of research was to predict the limit of salt water intrusion based on the value of DHL and TDS. The primary data were measured using a TOA EC meter CM-14P and then were processed using Surfer 9.0 software and ArcGIS. The measurement results was compared with PAHIAA Decision (1986) and Carroll’s Classification (1962). The results showed that the intrusion area could be identified by DHL and TDS values. On the area located far from the beach, intrusion was influenced by the presence of a river in the region. This was indicated by the regression analysis that showed a correlation between distance and value DHL/TDS with a negative slope value. Based on DHL and TDS parameters in observation area, the groundwater conditions in  Tangerang District within a radius of 0...

Causes of flooding can be caused by many things such as system capacity is decreased , the water flow rate increases , or a combination of both. Flood event occurs when the channel is no longer able to hold back the flow of water entering the channel as the channel dimensions are smaller than they should . In the design of the channel in Bogor Raya Permai housing aims to analyze the problem of flooding in the channel and to design the channel dimensions to prevent buttresses so it can be seen that the dimensions of the channel that can prevent or accommodate water during floods. The calculation begins by calculating the design flood peak discharge that could occur during a particular time period reset . In this study, the 25 -year return period . Return period of 25 years is considered quite able to cope with flooding that may occur . The results obtained from the calculation of flood discharge to the value I is 21.99 mm / hour . Required new drainage channel is based on the calculation that the peak discharge flow of 0.76 m3 / s can be undrained . The calculation of the dimensions of the new channel hydraulics best done by a cross section . Large peak flows are included in the range of 0.5 to 1.5 m3 / s , high surveillance to be constructed of 0.5 m of high -dimensional flow, so that the width and height respectively be 4.23 m and 1.91 m .

The protection of Karakelang wildlife sanctuary has been challenged by forest encroachment, timber harvesting and wildlife poaching - all of which are attributed to social economic condition of the communities living in the vicinity. A community based conservation program was delivered to strengthen communities’ role in maintaining forest integrity while making good income from sustainable agriculture. This action research using mixed methodology evaluates the influence of program delivery in changing the knowledge, attitude and practice of forest protection and sustainable agriculture among beneficiaries in three villages. Data was collected using structured interview, while other supporting information was taken from project reports and field notes. The Wilcoxon Signed Rank Test reveals that program has influence in changing the knowledge of respondents in both forest protection and sustainable agriculture, as well as in the change of attitude and practice regarding sustainable ag...

Western Java’s upland is a sanctuary of importants biodiversity in Indonesia for avifaunas, primates and mammals. Particularly for avifaunas, the upland becomes the last sanctuary after the disturbance and distraction by anthropogenic activities. This kind of situation raises needs to expand conservation site as an effort to protect the biodiversities. This research aims to find opportunities through the lens of actors. This research uses Collaboration/ Conflict, Legitimacy, Interest and Power (CLIP) frameworks to identifiy responses, positions ,and inter-actor relations if expansion of conservation site is initiated based on the Important Birds and Diversity Areas (IBAs). The result shows that out of five clusters of research sites, the Important Bird and Diversity Areas of Southern Bandung has some indicators which enable collaboration in the expansion. From the actor perspectives, there are five existing preconditions to support the implementation for expansion, namely availabili...

The Wallacea biogeographic region of Sulawesi, the Moluccas and Lesser Sunda is globally renowned for exceptional endemism, but is currently emerging as a development frontier in Indonesia. We assessed patterns and drivers of forest loss and fragmentation across the region, and used dynamic deforestation models to project future deforestation to 2053. Up to 10 231 km2 was deforested between 2000 and 2018, and a further 49 570 km2 is expected to be lost by 2053, with annual deforestation rates ranging between 0.09% and 2.17% in different sub-regions (average: 1.23%). Key biodiversity areas (priority sites for endemic and threatened biodiversity) are particularly vulnerable to deforestation if they are small, coastal and unprotected. Sub-regional variation in deforestation patterns and drivers must be acknowledged if conservation interventions are to be targeted and effective. We provide a valuable baseline from which to monitor Wallacea’s new development course, as Indonesia undergoe...

Abstrak : Biochemical Oxygen Demand atau Kebutuhan Oksigen Biologis (KOB) adalah jumlah oksigen yang dibutuhkan oleh mikroorganisme untuk mendegradasi atau menguraikan senyawa organik  berupa C, H, N, O yang terdapat dalam lingkungan, khususnya air. Penelitian ini bertujuan untuk menentukan konsentrasi BOD pada contoh uji dan mengetahui kondisi toksik aikbat adanya kontaminan yang sulit terdegredasi pada air tanah. Penelitian ini dilakukan di Laboratorium Polusi dan Kualitas Udara, Institut Pertanian Bogor. Bahan-bahan yang digunakan adalah larutan Mangan Sulfat (MnSO4), Asam Sulfat Pekat (H2SO4), alkali kombinasi antara KJ + NaN3, Na-tiosulfat (N2S2O3) 0,0125 N, larutan kanji, larutan penyangga Fosfat, Magnesium Sulfat (MgSO4), Kalsium Klorida (CaCl3), Ferri Klorida (FeCl3), larutan Asam Glutamat – Glukosa, Natrium Sulfit (Na2S2O3) 0,025 N, dan larutan basa NaOH atau HCl. Metode titrasi digunakan dalam penelitian ini untuk menentukan larutan Oksigen terlarut awal (DO0) dan Oksigen terlarut hari kelima (DO5).  Dilakukan perhitungan dari kedua data DO tersebut sehingga diperoleh konsentrasi BOD air tanah Lingkar Perwira sebanyak 0,77 mg/L. Berdasarkan Peraturan Pemerintah nomor 82 tahun 2001 tentang Pengelolaan Kualitas Air dan Pengendalian Pencemaran Air menetapkan kandungan BOD maksimum pada air kelas I adalah 2 mg/L dan BOD pada contoh uji masih lebih kecil dari baku mutu sehingga dapat dikategorikan air kelas I untuk parameter BOD. Dari hasil tersebut menunjukkan bahwa lokasi pengambilan  contoh uji masih aman untuk digunakan berdasarkan parameter BOD.
Kata kunci : Biochemical Oxygen Demand (BOD), Degradasi Mikroorganisme, Dissolved Oxygen (DO)