Judul: Study on the Effectiveness of Infiltration Wells in Effort to Control Runoff
Abstrak: Perubahan tata guna lahan mengakibatan banyaknya daerah resapan menjadi daerah kedap air. Hingga saat ini belum diketahui efektivitas sumur resapan yang telah dibangun terhadap pengurangan limpasan pada suatu daerah tangkapan air. Penelitian ini bertujuan untuk mengkaji efektivitas sumur resapan dalam mengurangi limpasan di sub DTA Situgede. Pada lokasi penelitian telah dibangun sumur resapan oleh Dinas Lingkungan Hidup (DLH) pada tahun 2021 sebanyak 10 buah. Lokasi penelitian merupakan DTA sumur resapan yang merupakan bagian dari sub DTA Situgede. DTA sumur resapan didominasi oleh lahan kedap air berupa bangunan gedung dan lapangan, dibandingkan dengan lahan vegetasinya. Dari 10 sumur akan dilakukan kajian pada dua buah sumur resapan yang merupakan representasi dari sumur secara keseluruhan. Data primer yang digunakan meliputi pengukuran curah hujan, lamanya hujan, debit limpasan yang masuk ke sumur resapan dan kedalaman muka air sumur resapan. Data sekunder yang digunakan meliputi data iklim, peta lokasi dan peta tutupan lahan. Data curah hujan yang digunakan adalah data curah hujan harian maksimum dan data curah hujan bulanan, Analisis neraca air dilakukan menggunakan metode Thornthwaite-Mather. Metode ini menggunakan data iklim selama 10 tahun dan peta tutupan lahan untuk melakukan analisis. Dari hasil analisis didapatkan grafik perbandingan curah hujan andalan 80% dan penguapan (ETp) yang menunjukkan kondisi surplus dan defisit. Hasil analisis neraca air menunjukkan bahwa terjadi defisit sebesar 18,2 mm/tahun dan surplus sebesar 1025,1 mm/tahun. Dari analisis neraca air diperoleh nilai limpasan yang dihasilkan sebesar 697.1 mm/tahun dan pengisian air tanah sebesar 328.0 mm/tahun. Analisis debit limpasan dilakukan menggunakan metode rasional. Metode ini membutuhkan data curah hujan harian maksimum selama 10 tahun. Nilai debit limpasan sebelum dibangun sumur resapan sebesar 0,25 m3/detik dan sesudah dibangun sumur resapan sebesar 0,11 m3/detik. Berarti terjadi pengurangan debit limpasan sebesar 0,14 m3/detik. Dari hasil pengukuran dan perhitungan dapat diketahui besarnya efektivitas sumur resapan yang meliputi efektivitas penangkapan hujan, efektivitas resapan dan efektivitas tampungan sumur resapan. Pada studi ini, nilai efektivitas penangkapan hujan sebesar 8%. Efektivitas sumur resapan dengan curah hujan sebesar 8,7 mm dan 12,9 mm mencapai 100% karena curah hujan tergolong ringan, sehingga pada tampungan sumur tidak terjadi limpahan. Efektivitas sumur resapan dengan curah hujan 30,6 mm sebesar 13 %, meliputi efektivitas resapan (8,4%) dan efektivitas tampungan (4,6 %)., Changes in land use have resulted in many catchment areas becoming impervious areas. Until now, the effectiveness of the infiltration wells that have been built in reducing runoff in a catchment area is unknown. This study aimed to assess the effectiveness of infiltration wells in reducing runoff in the Situgede sub-catchment. On the research location was built 10 infiltration wells by Office of Environmental Affairs (DLH). The research location is an infiltration well catchment area, which is part of the Situgede sub-catchment. The catchment area of infiltration wells is dominated by impervious area in the form of buildings and fields, compared to vegetated land as pervious area. Of the 10 wells, the study was conducted on two infiltration wells, as a representation of the well as a whole. The primary data used consisted of rainfall data, duration of rain, runoff discharge entering the infiltration well and the water level of
Keyword: efektivitas, limpasan, sumur resapan, effectiveness, infiltration well, run off

Judul: Efektivitas Pembangunan Sumur Resapan dalam Pengendalian Limpasan di Kelurahan Pinang Ranti dan Bendungan Hilir Jakarta
Abstrak: Jakarta City development has caused in the decline of open green space quantity. It impacts to decreasing soil infiltration capacity, increasing surface runoff and flood potential. The construction of Sumur Resapan aims to reduce flood potential and improve ground water reserves in Jakarta. RunOff estimation method using SCS-CN obtained value of 1,68 m3 in 77m2 of water catchment area in Pinang Ranti and 2,08m3 in 95m2 of water catchment area in Bendungan Hilir. The average rate of infiltration are 41,34 cm/jam and capable to infiltrate water by 3,33 m3 in Pinang Ranti. The average rate of infiltration are 10,34 cm/jam and capable to infiltrate water by 1,61 m3 in Bendungan Hilir. By the infiltration rate, it can be concluded that Sumur Resapan will not be full or overflowing.The constructon of sumur resapan can reduce runoff and increase soil water reserves so it is able to meet water needs of society, particularly in society who doesn’t affordable yet by PDAM.
Keyword: recharging well, infiltration

Judul: Categorization in Macaca fascicularis.
Abstrak: Categorization is an ability to group individuals or events into different classes mediated by conceptualized mental images. There are several levels of categorization and within a taxonomy the levels are nested. At the most concrete level of categorization, all or most members of the category shared common physical attributes that differ from other categories. The higher the level of category, the fewer common attributes between members of the group. In addition to humans, the ability to categorize has also been proposed in animals. One example of categorization in animal is species discrimination. Using matching-tosample task, present experiment tested ability of the long-tailed macaque (Macaca fascicularis) in discriminating dichotomous-stimuli of different animals. The species has been shown to be able to see photos as representations of real object so I used facial photos of humans and animals for the stimuli. First, I tested their ability to classify humans and macaques into separate group. Second, I tested their ability to discriminate their conspecific from other macaques. And the last, I tested whether the subjects were able to discriminate non-human animals from humans. In all of these experiments I found that the subjects showed high performance in categorizing objects, even when I discarded details of visual informations, such as color and local shapes. The ability to identify objects with reduced representation of physical properties means the subjects were able to generalize attributes of members of the group. This would indicate that the subjects created a higher level abstraction. On the other hand, in discriminating intrageneric macaque species I found that they were able to extract uniqueness of each species. More over, I also found that the subjects were able to put photos of non-human animals that shared very few similarities in physical percepts into one group. I suggested that the subjects could create a more abstract concept based on non-percepts relations as a basis to put the objects into one category. Thus, I concluded that M. fascicularis were able to perform multiple levels of categorizations.
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