Judul: Perencanaan Sumur Resapan dan Kolam Retensi di Bogor Barat Agrohills Kabupaten Bogor
Abstrak: Bogor Barat Agrohills adalah proyek kaveling berkonsep eduwisata di Kecamatan Leuwisadeng Kabupaten Bogor. Saat ini pemerintah berupaya untuk menyimpan air sebanyak mungkin ke dalam tanah dan berusaha untuk mencapai zero runoff. Sejalan dengan itu maka penelitian bertujuan merencanakan sumur resapan dan kolam retensi di Bogor Barat Agrohills. Dari hasil analisis diperoleh nilai permeabilitas tanah di lokasi tidak memenuhi syarat SNI 03-2453-2002 sehingga direncanakan hanya pembuatan kolam retensi. Dari analisis curah hujan dengan metode Gumbel, diperoleh curah hujan rencana sebesar 147,9 mm untuk periode ulang 5 tahun. Dari hasil pengamatan diperoleh 4 daerah tangkapan air (DTA) dan nilai koefisien limpasan gabungan sebesar 0,32. Kolam retensi direncanakan memiliki 3 tipe dan berjumlah satu buah di tiap DTA. Tipe 1 memiliki panjang 10,0 m dan lebar 6,7 m. Tipe 2 memiliki panjang 8,6 m dan lebar 5,8 m. Tipe 3 memiliki panjang 6,4 m dan lebar 4,3 m. Ketiga tipe kolam memilki kedalaman 4 m. Lokasi kolam retensi direncanakan di dekat outlet setiap DTA. Kolam tipe 1 berjumlah dua buah sedangkan kolam tipe 2 dan tipe 3 masing - masing satu buah. Biaya pembuatan kolam retensi tipe 1 (2 buah kolam) sebesar Rp159.620.000,00, tipe 2 sebesar Rp68.310.000,00, dan tipe 3 sebesar Rp52.150.000,00., Bogor Barat Agrohills is a land plot project with an edutourism concept in Leuwisadeng District, Bogor Regency. Currently the government is trying to store as much water as possible into the ground and to achieve zero runoff. Accordingly, this study aims to plan infiltration wells and retention ponds in Bogor Barat Agrohills. From the results of the analysis, the permeability value of the soil at the location does not meet the SNI 03-2453-2002 requirements, so only retention ponds were planned. From the rainfall analysis using the Gumbel method, a design rainfall was 147.9 mm for the 5-year return period. From the observations were obtained 4 water catchment areas and a combined runoff coefficient value of 0,32. Three types of retention ponds were planned and one pond in each catchment area. Type 1 had dimention of 10,0 m long and 6,7 m wide and type 2 had 8,6 m long and 5,8 m wide, while type 3 had 6,4 m long and 4,3 m wide. The three types of ponds had a depth of 4 m. The location of the retention ponds were planned near the outlet of each DTA. There were two ponds of type 1 pond and one each of type 2 and type 3 ponds. The construstion cost of retention pond type 1 (2 ponds) was IDR159.620.000.00, type 2 was ID68.310.000.00, and type 3 was IDR52.150.000.00.
Keyword: permeability, runoff coefficient, runoff volume

Judul: Drainage System Planning in West Bogor Agrohills Bogor Regency West Java
Abstrak: Alih fungsi lahan dapat mengubah laju infiltrasi, dan hal ini akan berdampak pada berkurangnya daerah resapan dan meningkatnya limpasan. Penelitian ini bertujuan untuk merancang sistem drainase di Bogor Barat Agrohills. Perencanaan sistem jaringan drainase dilakukan berdasarkan peta topografi, analisis curah hujan maksimum dan debit limpasan, termasuk perencanaan dimensi saluran, dan gorong gorong. Bogor Barat Agrohills mempunyai pola aliran parallel grid system dan natural system. Saluran primer pada daerah tangkapan air (DTA) 1 sampai 4 masing-masing memiliki lebar dan kedalaman saluran berturut-turut sebesar: (0,7 x 0,9) m, (0,6 x 0,8) m, (0,5 x 0,7) m, dan (0,6 x 0,8) m. Saluran sekunder pada DTA1 sampai 4 masing-masing memiliki lebar dan kedalaman saluran berturut-turut sebesar: (0,4 x 0,6) m, (0,4 x 0,6) m, (0,4 x 0,6) m, dan (0,5 x 0,7) m. Berdasarkan hasil analisis kapasitas, saluran sudah sesuai terhadap volume limpasan. Tipe saluran gorong-gorong yang digunakan yaitu saluran beton bertulang persegi (box culvert). Direncanakan saluran gorong-gorong sebanyak 15 trase pada DTA 1, 2, dan 4. Gorong-gorong pada DTA 4 berukuran (0,7 x 0,7) m dan pada DTA 2 berukuran (0,5 x 0,5) m, sedangkan pada DTA 1 berukuran (0,6 x 0,6) m., Land conversion can change the rate of infiltration, and this will have an impact on reducing the catchment area (DTA) and increasing runoff. This study aimed to design the drainage system in Bogor Barat Agrohills. The drainage network system planning was conducted based on topographic maps, analysis of maximum rainfall and runoff discharge, including planning for channel dimensions and culverts. Bogor Barat Agrohills has a parallel grid system and natural system. The primary channels in DTA 1 to 4 have width and depth of (0,7 x 0,9) m, (0,6 x 0,8) m, (0,5 x 0,7) m, and (0,6 x 0,8) m respectively. The secondary channels in DTA1 to 4 have width and depth of (0,4 x 0,6) m, (0,4 x 0,6) m, (0,4 x 0,6) m, and (0,5 x 0,7) m respectively. Based on the analysis results of the channels capacity, the channel is suitable for the volume runoff. The type of culvert channel is a rectangular reinforced concrete channel (box culvert). The culverts were design with 15 lines in DTA 1, 2, and 4. The culverts in DTA 4 have a dimension of (0,7 x 0,7) m and in DTA 2 have a dimension of (0,5 x 0,5) m, while in DTA 1 have a dimension of (0,6 x 0,6) m.
Keyword: culvert, drainage channel, dta, runoff volume

Judul: Characteristic of chili drying (Capsicum annum L.) as a natural dyeing cosmetic
Abstrak: Chilli (Capsicum sp.) contains carotenoids, which are a group of natural pigments consist of red, orange or yellow color. Carotenoids can be dissolved in lipid so that they can be applied to oil-based cosmetic ingredients. Therefore, chilli is potential to be developed as cosmetic colorants. However, pungency of red chili needs to be removed because it is irritating and it provides stinging sensation to skin. Red chilli was investigated as a potent material for a cosmetic colourant in this research because it has a nice uniform red color and has a pungency level less than cayenne pepper. The purpose of this research was to investigate the influence of blanching on drying characteristics of red chilli using a tray dryer, determine the proper time of chili blanching in sodium bisulfite solution, examine color changes stability of red chili powder as a cosmetic dye, and analyze the effect of oleoresin extraction on color and pungency level of red chili powder. The results showed that blanching could affect the drying characteristics. Blanching the chilli for 9 minutes prior drying could speed up the drying rate of chilli and thus the drying time, therefore, the chilli achieved the desired moisture content fast. Sodium bisulfite solution of 0.2%, used as the blanching media, could maintain the color well. However, longer time of blanching might cause several pigments soluble in the blanching media. Blanching the chilli for 9 minutes was able to maintain red color after the stability tested and after extraction of oleoresin. Therefore, blanching red chilli in a solution of 0.2% sodium bisulfite for 9 minutes prior drying is concluded as the best treatment to retain the color of red chilli powder
Keyword: