Judul: Stilling Basin Evaluation on Rentang Weir Majalengka Regency
Abstrak: Bangunan stilling basin (kolam olak) memiliki fungsi menstabilkan aliran agar gerusan pada dasar sungai tidak akan terjadi. Oleh karena itu, evaluasi stilling basin perlu dilakukan untuk mengetahui fungsi bangunan tetap optimal. Penelitian ini bertujuan mengevaluasi bangunan stilling basin serta merencanakan ulang bangunan stilling basin pada Bendung Rentang Kabupaten Majalengka. Penelitian dilaksanakan pada bulan Maret–Juni 2022. Pelaksanaan penelitian diawali dengan pengumpulan data sekunder yang meliputi data hujan, data topografi, serta data teknis bendung. Selanjutnya, data hujan tersebut diolah untuk menentukan nilai curah hujan rencana melalui metode Weibull dan Gumbel, serta debit banjir rencana melalui hidrograf Nakayasu. Evaluasi dan perencanaan ulang dimensi stilling basin dilakukan berdasarkan bilangan Froude yang diperoleh. Metode pada perhitungan curah hujan rencana yang terpilih, yaitu berdasarkan distribusi Gumbel. Hasil evaluasi stilling basin yang dilakukan berdasarkan debit sungai tertinggi pada tahun 2021 diperoleh nilai Fr > 1. Pada perencanaan ulang bangunan stilling basin digunakan debit banjir rencana berdasarkan periode ulang 50 tahun, yaitu sebesar 2988,27 m3/detik. Pada perencanaan diperoleh bilangan Froude sebesar 3,4, maka bangunan stilling basin yang sesuai adalah menggunakan jenis USBR tipe IV., The stilling basin has the function to stabilize the flow so the scouring on the riverbed will not occur. Therefore, it is necessary to evaluate the stilling basin to determine the optimal function of this structure. This study aims to evaluate and redesign the stilling basin on the Rentang Weir, Majalengka Regency. The implementation of the research commenced by collecting of secondary data, including rainfall record, topographic, and weir technical data. Furthermore, the rainfall record is processed to determine the value of the rainfall design distribution using the Weibull and Gumbel methods and the design flood discharge using the Nakayasu hydrograph. The evaluation and redesign stilling basin structure dimensions are carried out based on the obtained Froude number. The method for calculating the rainfall design is based on the Gumbel distribution. The evaluation of the stilling basin based on the highest river discharge in 2021 obtained a value of Fr > 1. In the redesign of the stilling basin structure, a design flood discharge was used based on a 50-year return period, which was 2988,27 m3/second. The obtained Froude number of the redesign result is 3,4, so the appropriate stilling basin structure is USBR type IV.
Keyword: Froude number, Nakayasu hydrograph, stilling basin

Judul: Review of Runoff in the Context of  Construction of the Baranangsiang Retention Pool in Bogor City
Abstrak: Beberapa faktor penyebab banjir, seperti berkurangnya daerah tangkapan air akibat peralihan fungsi lahan dan curah hujan tinggi menjadi dasar dalam perencanaan kolam retensi. Pengkajian ulang limpasan untuk pembangunan kolam retensi Baranangsiang dilakukan seiring dengan perubahan landuse dan curah hujan. Penelitian ini bertujuan menganalisis volume limpasan serta merekomendasikan kapasitas dan dimensi kolam retensi yang sesuai dengan volume limpasan. Digunakan metode Hidrograf Satuan Sintetik Nakayasu dan diperoleh debit puncak runoff dengan kala ulang 5 tahun sebesar 7,26 m3/detik dan volume kumulatif limpasan sebesar 69.187,13 m3 sedangkan kapasitas tamping kolam hasil kaji awal hanya 38.573,48 m3. Efektivitas tampungan kolam retensi hasil kaji awal terhadap volume limpasan diperoleh sebesar 55,75 % sehingga perlu dilakukan perubahan dimensi tampungan kolam dari 9.643,37 m3 menjadi 11.531,19 m3 untuk luas kolam dan kedalaman kolam retensi diubah dari 4 m menjadi 6 m sehingga efektivitas kolam retensi menjadi 100%. Dinding kolam retensi menggunakan tipe kantilever di inlet kolam. Beda tinggi antara inlet dan outlet sekitar 7 m sehingga pada titik keluar (outlet) dibangun konstruksi tubuh bendungan dengan tinggi 7 m dan lebar bentang pondasi 9,61 m., Several factors that cause flooding, such as reduced water catchment areas due to landuse changes and high rainfall, are the basis for planning retention ponds. The review of runoff for the construction of the Baranangsiang retention pond was carried out in line with changes in landuse and rainfall. This research aims to analyze runoff volume and recommend the capacity and dimensions of retention ponds that are appropriate to the runoff volume. The Nakayasu Synthetic Unit Hydrograph method was used and the peak runoff discharge with a return period of 5 years was 7.26 m3 /second and the cumulative runoff volume was 69,187.13 m3 , while the tamping capacity of the pond from the initial study was only 38,573.48 m3 . The effectiveness of the retention pond storage from the initial study on runoff volume was found to be 55.75% so it was necessary to change the dimensions of the retention pond from 9,643.37 m3 to 11,531.19 m3 for the area of the pond and the depth of the retention pond to be changed from 4 m to 6 m so that the effectiveness of the pond retention to 100%. The retention pool wall uses a cantilever type at the pool inlet. The height difference between the inlet and outlet is around 7 m so that at the outlet point a dam body construction is built with a height of 7 m and a foundation span width of 9.61 m.
Keyword: discharge, runoff volume, retention pond, effectiveness, dimensions

Judul: Karakteristik Emulsifier dari otak sapi yang diekstrak dengan menggunakan pelarut yangberbeda
Abstrak: Brain is an animal by-product which has the highest phospholipids a ~cdho lesterol content. Phospholipids in brain consist of a polar head (phosphate acid) and nonpolar tail (lipid). Therefore, phospholipids can be used as an emulsifier in emulsion products such as cosmetics and pharmaceutical.
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