Judul: Zero Runoff Concept Analysis in RT 02, Babakan Village, Dramaga District, Bogor
Abstrak: Perubahan tata guna lahan yang mengakibatkan berkurangnya daya resapan tanah dan curah hujan yang selalu meningkat sehingga berpotensi menyebabkan terjadinya banjir, membutuhkan suatu upaya khusus untuk mencegah terjadinya hal tersebut. Kawasan RT 02, Desa Babakan, Bogor adalah salah satu kawasan yang tidak luput dari bencana banjir. Penelitian dilakukan di perumahan ini dengan tujuan mendapatkan suatu sistem resapan air hujan untuk mengurangi resiko banjir. Terlebih dahulu dilakukan observasi lapangan, analisis hujan dan pendugaan permeabilitas tanah untuk dijadikan rujukan dalam menentukan desain hidrolika bangunan resapan air. Kemudian dilakukan perhitungan matematis untuk menentukan volume banjir, kapasitas resapan dan efektivitas resapan yang dihasilkan. Hasil penelitian menunjukkan bahwa debit banjir di Kawasan RT 02 sebesar 1536.28 m3. Untuk mengatasi banjir ini, dapat dibangun sumur resapan di beberapa rumah dan rorak dan diperkirakan dapat mengurangi sekitar 58.24% dari debit banjir yang terjadi atau sekitar 860.63 m3. Selanjutnya, sisa limpasan yang tidak terserap diperkirakan dapat ditampung oleh saluran drainase yang sudah ada., Changes in land use which results in reduced soil absorption capacity and increased rainfall that has potential to cause flooding requires a special effort to prevent this from happening. Area of RT 02 is one of the residential that was not spared form such disasters. Study was conducted in the residental area with the goal of getting a rainwater infiltration system to reduce the risk of flooding. First of all, field observation, rain analysis and estimating hydrolic conductivity were conduced to be reference in determining hydraulic design of water infiltration building. After that calculations should be done to determine the volume of flooding, infiltration capacity and effectiveness of the resulting infiltration. The research showed that flood charge in area of RT 02 is about 1536.28 m3. To overcome this flooding problem, infiltration wells can be built at some homes and building an infiltration system (check boxes) along the main drainage channel in the residental area. These infiltration systems are estimated to reduce about 58.24% of the flood discharge occurring or about 860.63 m3. Furthermore, the rest of the runoff that is not absorbed is expected to be accommodated by the existing drainage channel.
Keyword: flooding, infiltration wells, residential drainage, zero runoff

Judul: Perencanaan Drainase dengan Konsep Zero Run-Off pada Kawasan Hotel Duta Berlian, Bogor
Abstrak: Saluran Drainase pada kawasan Hotel Duta Berlian yang terletak di Desa Balungbang Jaya, Kecamatan Bogor Barat mengalami sampah-sampah di aliran drainase pada kawasan tersebut yang menyebabkan saluran drainase tidak berfungsi dengan baik. Tujuan dari penelitian ini adalah mengurangi terjadinya genangan dan limpasan (runoff) dengan menggunakan konsep zero runoff dan menentukan nilai efektivitas pengurangan limpasan. Data primer yang digunakan berupa nilai permeabilitas tanah data sekunder berupa data curah hujan 10 tahun terakhir dari tahun 2013-2022, data Digital Elevation Modeling (DEM) dan jenis tanah pada lokasi penelitian. Kawasan Hotel Duta Berlian dengan luas kawasan sebesar 13308 m2 dengan curah hujan rencana sebesar 128 mm memiliki nilai koefisien limpasan sebesar 0,46. Nilai volume andil banjir sebesar 670,79 m3. Nilai Qt (limpasan) tanpa sumur resapan diperoleh sebesar 48,38 m3/jam, dan setelah digunakan sumur resapan menjadi 42,32 m3/jam. Total Jumlah sumur resapan dan rorak dari hasil perhitungan yaitu sebanyak 24 buah dan rorak sebanyak 102 buah untuk saluran parit sepanjang 307 m. Volume andil banjir di wilayah tersebut berkurang setelah dilakukan penambahan sumur resapan dan rorak pada parit yaitu sebesar 400,71 m3. Sehingga nilai efektifitas bangunan resapan dengan menggunakan konsep zero runnoff yaitu sebesar 59,74%., The drainage channel in the Duta Berlian Hotel area, which is located in Balungbang Jaya Village, West Bogor District, has had garbage in the drainage in the area which causes the drainage channel to not function properly. The purpose of this study is to reduce the occurrence of inundation and runoff by using the concept of zero runoff and determine the value of the effectiveness of reducing runoff. The primary data used is soil permeability value, secondary data is rainfall data for the last 10 years from 2013-2022, DEM (Digital Elevation Modeling) data and soil type at the study site. The Duta Berlian Hotel area with an area of 13308 m2 with a planned rainfall of 128 mm/day has a runoff coefficient value of 0,46. The flood share volume value is 670,79 m3. The Qt (runoff) value without infiltration wells was 48,38 m3/hour, and after using the infiltration wells it became 42,32 m3/hour. The total number of infiltration wells and rorak from the calculation results are 24 and 102 rorak for a 307 m long ditch. The volume of flooding in the area decreased after the addition of infiltration wells and rorak in the ditch, which amounted to 400,71 m3. So that the value of the effectiveness of the infiltration building using the zero runoff concept is equal to 59,74%.
Keyword: Drainage, Soil Permeability, Infiltration Well, Rorak

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
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