Judul: Desain Kolam Retensi Berbantu Komputer di Cibuluh Kota Bogor
Abstrak: Kolam retensi berfungsi mengendalikan limpasan permukaan dan konservasi air hujan dalam menjaga akumulasi air tanah. Penelitian ini bertujuan mengetahui debit banjir rencana, mengetahui volume air yang harus ditampung kolam retensi, menentukan kapasitas volume tapungan kolam retensi yang optimal, menghasilkan rancangan desain teknis kolam retensi yang efektif, dan menghasilkan rencana anggaran biaya. Penelitian dilaksanakan di Kampung Cibuluh, Kelurahan Tanah Baru, Kecamatan Bogor Utara, Kota Bogor, Jawa Barat. Komulatif debit banjir yaitu 12,01 m3/det. Kapasitas sungai Ciheuleut adalah 9,38 m3/det. Kapasitas total volume kolam retensi sebesar 5272,52 m3. Kapasitas lahan pembangunan kolam retensi adalah 10481 m2. Luas kolam retensi yang bisa dibangun adalah 4241 m2. Kedalaman galian kolam retensi adalah 4 m sehingga kapasitas kolam retensi sebesar 16964 m3. Struktur kolam retensi berbentuk oval. Dimensi diameter terpendek sebesar 50 m dan diameter terpanjanng sebesar 108 m. Rencana kedalaman total kolam 6 m mampu menampung air maksimal 25446 m3. Direncanakan pintu air jenis sorong dengan bentang bebas 1300 mm x tinggi 1600 mm dengan debit 4,89 m3/detik. Dibutuhkan total 5 pintu air untuk kolam retensi pada inlet dan outlet. Biaya yang dibutuhkan dalam pembangunan Kolam Retensi Cibuluh adalah sebesar Rp13.680.570.000,00.
Keyword: Dimensi, kapasitas, kolam retensi, pintu air, volume

Judul: Review of Runoff in the Context of  Construction of the Baranangsiang Retention Pool in Bogor City
Abstrak: Beberapa faktor penyebab banjir, seperti berkurangnya daerah tangkapan air akibat peralihan fungsi lahan dan curah hujan tinggi menjadi dasar dalam perencanaan kolam retensi. Pengkajian ulang limpasan untuk pembangunan kolam retensi Baranangsiang dilakukan seiring dengan perubahan landuse dan curah hujan. Penelitian ini bertujuan menganalisis volume limpasan serta merekomendasikan kapasitas dan dimensi kolam retensi yang sesuai dengan volume limpasan. Digunakan metode Hidrograf Satuan Sintetik Nakayasu dan diperoleh debit puncak runoff dengan kala ulang 5 tahun sebesar 7,26 m3/detik dan volume kumulatif limpasan sebesar 69.187,13 m3 sedangkan kapasitas tamping kolam hasil kaji awal hanya 38.573,48 m3. Efektivitas tampungan kolam retensi hasil kaji awal terhadap volume limpasan diperoleh sebesar 55,75 % sehingga perlu dilakukan perubahan dimensi tampungan kolam dari 9.643,37 m3 menjadi 11.531,19 m3 untuk luas kolam dan kedalaman kolam retensi diubah dari 4 m menjadi 6 m sehingga efektivitas kolam retensi menjadi 100%. Dinding kolam retensi menggunakan tipe kantilever di inlet kolam. Beda tinggi antara inlet dan outlet sekitar 7 m sehingga pada titik keluar (outlet) dibangun konstruksi tubuh bendungan dengan tinggi 7 m dan lebar bentang pondasi 9,61 m., Several factors that cause flooding, such as reduced water catchment areas due to landuse changes and high rainfall, are the basis for planning retention ponds. The review of runoff for the construction of the Baranangsiang retention pond was carried out in line with changes in landuse and rainfall. This research aims to analyze runoff volume and recommend the capacity and dimensions of retention ponds that are appropriate to the runoff volume. The Nakayasu Synthetic Unit Hydrograph method was used and the peak runoff discharge with a return period of 5 years was 7.26 m3 /second and the cumulative runoff volume was 69,187.13 m3 , while the tamping capacity of the pond from the initial study was only 38,573.48 m3 . The effectiveness of the retention pond storage from the initial study on runoff volume was found to be 55.75% so it was necessary to change the dimensions of the retention pond from 9,643.37 m3 to 11,531.19 m3 for the area of the pond and the depth of the retention pond to be changed from 4 m to 6 m so that the effectiveness of the pond retention to 100%. The retention pool wall uses a cantilever type at the pool inlet. The height difference between the inlet and outlet is around 7 m so that at the outlet point a dam body construction is built with a height of 7 m and a foundation span width of 9.61 m.
Keyword: discharge, runoff volume, retention pond, effectiveness, dimensions

Judul: Oil price and macroeconomics variables effects on stock price index (comparative study: South East Asia, East Asia, Europe, and America)
Abstrak: Crude oil is one factor that drive the world economy today. Its price performance is benchmark for the performance of the world economy because of its role is considered important in production process. Seven major stock indices in Asia has increased significantly as well as the increase in oil price since early 2002. Data shows since 2003 until 2008, Hang Seng rose 54,78 percent, BSE increased 71,22 percent, JKSE increased 74,80 percent, KLSE rose 45,06 percent, Nikkei rose 30,25 percent, Strait Times rose 49,33 percent, and KOSPI rose 57,27 percent. The improvement of global oil price followed by rising indices in Asia is not in accordance with the transmission mechanism and raises the question whether there is positive movement towards the oil price movement of stock price indices in Asia, whereas some countries in Asia are oil importers, particularly East Asia and India. Influence oil price on the economy may be different. Oil exporting countries got advantange from positive trends in oil price because of their income increases with rising oil price, while higher oil price would make oil importing countries have to pay more for their oil needs. The purpose of this study was to analyze how oil price and macroeconomic variables affect on stock price index in South East Asia, East Asia, Europe, and America countries. The data is monthly time series data from January 2000 until December 2009. Then, it analyzed using VAR/VECM with analysis tools IRF, and FEVD. The result showed that generally in Asia, stock price index in all Southeast Asia as well as India and South Korea would respond negatively to the oil price. If there were an increase in world oil price, it would lower the stock price index in each of these Asian countries. Stock price indices in European countries, namely FTSE, DAX, CAC, and SMI indicate different results. In general, FTSE, DAX, and SMI would positively respond to oil price movements, different from others, CAC would respond negatively. As in Europe, mostly stock price indices in America has also responded positively in oil price, except in Brazil which responded negatively.
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