Judul: Peak Discharge Estimation of Upper Ciliwung Watershed
Abstrak: Debit puncak aliran sungai Ciliwung Hulu merupakan informasi yang sangat penting dalam perencanaan struktur pengendali banjir dalam periode ulang tertentu. Namun, Stasiun Pengamat Arus Sungai (SPAS) sebagai sarana pengukur tidak tersedia pada setiap Sub DAS. Tujuan dari penelitian ini adalah mengkaji akurasi Model Rasional untuk memprediksi debit puncak dan melakukan pendugaan debit puncak pada tiap Sub DAS Ciliwung Hulu. Pendugaan debit puncak dilakukan dengan metode Rasional menggunakan distribusi Gumbel dan Log Pearson tipe III. Hasil perhitungan menunjukkan metode Rasional memiliki akurasi pendugaan baik dalam periode ulang T1 hingga T10 tahun yaitu R2 = 0,98; NSE = 0,14 pada distribusi Gumbel dan R2 = 0,99; NSE = 0,86 pada distribusi Log Pearson tipe III. Selanjutnya model Rasional dengan distribusi Log Pearson tipe III dipilih sebagai prediksi debit puncak dalam periode ulang T1 hingga T10, T25, T50 dan T100 tahun pada tujuh Sub DAS Ciliwung Hulu, yaitu Sub DAS Cibalok, Ciesek, Ciliwung Hulu, Cisarua, Ciseuseupan, Cisukabiru, dan Cisuren. Berdasarkan pendugaan dengan metode Rational, nilai debit puncak terendah pada periode ulang 1 tahun terjadi di Sub DAS Ciesek yaitu sebesar 2,04 m3/detik dan tertinggi terjadi di Sub DAS Ciliwung Hulu yaitu sebesar 20,32 m³/detik ., The peak discharge of the Upper Ciliwung River is very important for flood control planning structure in a certain return period. However, The River Flow Observation Station (RFOS) as a measuring tool is not available in every Upper Ciliwung Sub watershed. The objectives of this research are to assess the accuracy of Rational method in estimating the peak discharge and to estimate the peak discharge in each Sub watershed. The peak discharge was estimated using Rational method with Gumbel and Log Pearson type III distribution. The result showed that Rational method has a very good estimation accuracy within return period T1 until T10 which are R2 = 0,98; NSE = 0,14 for Gumbel and R2 = 0,99; NSE = 0,86 for Log Pearson type III. Furthermore, the Rational model with Log Pearson type III distribution is choosen to estimate the peak discharge within return period T1 until T10, T25, T50, and T100 in the seven Upper Ciliwung Watershed, which are Cibalok, Ciesek, Ciliwung Hulu, Cisarua, Ciseuseupan, Cisukabiru, and Cisuren Sub Watershed. Based on the peak discharge estimation using Rational method, the lowest value was within return period 1 year which is 2,04 m3/s in Ciesek Sub Watershed and the highest value was within return periode 100 year which is 97,11 m3/s in Upper Ciliwung Sub Watershed.
Keyword: Gumbel distribution, Log Pearson distribution, peak discharge, Rational method, return period

Judul: Simulasi Debit Puncak dan Distribusi Aliran Sungai Ciliwung Hulu
Abstrak: Daily discharge data of Ciliwung Watershed have been measured based on water level on Water Level Stations of Katulampa. Discharge of Ciliwung Watershed is contributed by its sub-watershed discharge. Discharge data of each sub-watersheds are not recorded, therefore sub-watershed discharge needs to simulate. The aim of this study is to simulate contribution of each sub-watershed discharge of Upper Ciliwung Watershed. The peak discharge was estimated using HEC-WMS v.8.1 with Soil Conservation Service - Curve Number (SCS-CN) method. The result showed that the simulated peak discharges has a good correlation with observed peak discharges, with the value of R2 is 0,701. RMSE is 15,55 with the lowest peak discharge is 8,23 m3/s and highest is 102,26 m3/s. The Upper Ciliwung Watershed is divided into six sub-watersheds, which are Tugu (4897 ha), Ciesek (2564 ha), Cisarua (2293 ha), Cisukabirus (1729 ha), Cibogo (1285 ha), and Ciseuseupan (1207 ha). CN of sub-watersheds are 74,0 for Ciesek, 72,5 (Tugu), 71,0 (Cisukabirus), 70,7 (Cibogo), 69,3 (Cisarua), and 67,9 (Ciseuseupan). The result showed that Tugu sub-watershed contributed the highest discharge (39%), then followed by 29% (Ciesek), 11% (Cisukabirus), 9% (Cisarua), 7% (Cibogo), and 3% (Ciseuseupan).
Keyword: Bogor Agricultural University (IPB), SCS-CN, HEC-WMS v.8.1, peak discharge, direct runoff, stream flow

Judul: Karakterisasi Mutu dan Identifikasi Komponen Aroma Minyak Pala (Nutmeg oil) Indonesia sebagai Bahan Baku Industri Flavor
Abstrak: Nutmeg oil is an essential oil which obtained by distillation process of the mature and dry nutmeg seed and mace. Nutmeg oil is a used in several industries especially in the flavor industries.
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