Judul: Kurva Lengkung Debit Aliran (Discharge Rating Curve) dan Karakteristik Debit Aliran Sungai Cidurian Kabupaten Serang, Provinsi Banten
Abstrak: River discharge is an important hydrological parameters that are used as information for planning and management of a watershed. The continuous data of the river discharge is urgently needed to support planning and watershed management programs. The continuous river discharge data is obtained by converting the river water level to river discharge using the discharge rating curve. The objectives of this research are to establish the discharge rating curve of Cidurian River and to evaluate discharge characteristics of Cidurian River in the year of 2008-2012. The discharge rating curve established a model of power is used. The discharge rating curve has been established then is used to analyze the characteristics of Cidurian River discharge. The regression equation of discharge rating curve that has been established from the results of measurements of river water level and discharge in 1998-2010 that is Q = 9.79h1,35, which resulted the coefficient of determination (R2 ) of 0.85 and RSME (Root Mean Square Error) value that is equal to 0.28. The effective water level when there is no flow is 0.1 m, the equation must be adjusted and becomes: Q = 9.79(h+0.1)1.35. Because the highest the river water level data is used that 2 m, so the discharge rating curve is only valid is used to estimating the discharge at maximum the water level 2 m. Pattern of flow rate fluctuation for the five years (2008-2012) is quite extreme, particularly in the year of 2010 due to La Nina. Nevertheless, the highest flow rate occured in 2012 which is amounted of 145.96 m3/sec, while the lowest flow occurred in 2011 in the amount of 0.37 m3/sec. The highest monthly average discharge occurred in February (28.78 m3/sec), while the lowest monthly average discharge occurs in July (10.95 m3/sec). The highest ratio of maximum and minimum annual discharge was in the year 2012 (293.48), while the lowest occurred in 2009 (107.63). Cidurian watershed conditions in 2008-2011 categorized as moderate, while it is categorized as poor in the year of 2012. Total volume of flow occurred in 2010 that reached to 996.73 mm with coefficient of runoff was 0.43. While the lowest total volume of flow occurred in 2011 (443.32 mm) with a coefficient of runoff was 0.25.
Keyword: watershed., river water levels, fluctuations, discharge rating curve, discharge

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: Pemanfaatan Ekstrak Bunga Rosela (Hibiscus sabdariffa L) Kaya Antioksidan Dalam Pembuatan Mayonnaise Berbahan Dasar Minyak Kelapa, Minyak Sawit, dan Minyak Kedelai
Abstrak: The addition of Rosella flower extract and utilization various oli such as coconut, palm and soy were being involved in production of mayonnaise. Mayonnaise is a kind of ketchup which use canola or olive oil, egg, salt, and pepper and had been developed in France. The addition of Rosella extract (5%, 10% and 15%) base on amount of oil that used in production. Mayonnaise formulation are 75-78% oil, 6-9% egg yolk and flavors. Hedonic and hedonic quality sensory evaluations tested base on kind of oil. Base on evaluation the addition of Rosella extract statistically influenced color and thickness of coconut oil mayonnaise, color of palm oil mayonnaise, color and taste of soy oil. Fat analyze showed that there were statistically no difference between selected mayonnaise as well as protein and carbohydrate. Antioxidant activity and anthocyanine analyze showed that there were statistically difference between mayonnaise. Highest antioxidant activity and anthocyannin reached by palm oil mayonnaise with 15% Rosella extract.
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