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: Analisis Curah Hujan Harian Maksimum Untuk Pendugaan Debit Puncak Daerah Aliran Sungai Ciliwung Hulu
Abstrak: The peak discharge numbers are needed in water resource management, especially for flood management. If the data are unavailable, peak discharge can be generated using daily rainfall data and watershed characteristics. The purpose of this study was to design peak discharge of the Upper Ciliwung Watershed using daily rainfall data. The Mononobe method was used to estimate rainfall intensity and rational method was used to estimate the design peak discharge. The results show concentration time (Tc) of the Upper Ciliwung watershed was 1.5 hours while the peak discharge at 2, 5, 10, 25, 50, and 100 years return period were 392 m3/s, 600 m3/s, 739 m3/s, 927 m3/s, 1063 m3/s, dan 1214 m3/s respectively. Land use change in the Upper Ciliwung cause an increase in peak discharge from 205 m3/s in 1996 to 392 m3/s in 2010.
Keyword: return period, rainfall intensity, peak discharge, rainfall

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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