Judul: Penentuan Tipe Konstruksi Sumur Resapan Berdasarkan Sifat-sifat Fisik tanah dan Kondisi Sosial Ekonomi Masyarakat di Kawasan Puncak
Abstrak: A change of land utilization from agriculture and forest land to either utilization such as for housing area, villa, hotels, and restaurants will have an impact on the decrease of water absorption level and increase of run off. This study is an experimental test on four types of water infiltration well which were placed at eight location at Puncak area. This research had been conducted for six months, from February until July 1998. The objectives of this study are : (1) to analyze the ability of different types of water infiltration well to absorb water; (2) to analyze the correlation between water volume in the water infiltration well and soil's physical characteristics; (3) to analyze the extent of relationship between rainfall intensity as well as width of roof area and the water volume in the water infiltration well; (4) to examine the extent of knowledge and acceptance of the iocal community to the water infiltration well. This studi collected primary data (soil's physical characteristics, water absoption rate, rainfall, water quality of water infiltratior~ well, and socioeconomic), and secondary data. Interviews which were to 50 respondents were carried out chosen by the method of purpossive sampling. The results of water absorption rate measurement in the water infiltration well indicated that the water absorption rate ranges from 0,97 to 5,06 mlday. The highest water absorption rate was occurred at the water infiltration well of type IV. The Pearson's correlation analysis showed that the soil drainage porous, aggregate stability, texture of clay fraction, and infiitration have no significant correlation with the water volume in the water infiltration well (p>0,15). Whereas permeability and texture of sand fraction have a significant correlation with the water volume in the water infiltration well (p<0,15). The multiple regression analysis showed that the width of roof area and the water volume in the water infiltration well have not a significant correlation (p>0,15), while the water volume in the water infiltration well have a significant correlation with rainfall intensity (pc0,15). The extent of respondents knowledge on the water infiltration well was a relatifly low, but most of them have a positive attitude towards water infiltration well. Water quality of the water infiltration well (clearness, DHL, and pH) met the conditions of clean water.
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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: Ornithonyssus Bursa (Berlese, 1888) Famili Macronyssidae yang Menyerang Unggas Dan Penaggulangannnya
Abstrak: Ornithonyssus bursa adalah tungau penghisap darah pada unggas di daerah tropis dan subtropis. Tungau ini relatif kecil, dengan panjang tubuh antara 700-1000 mikron dan lebarnya 250-490 mikron. Tubuhnya bulat berwarna coklat kekuningan sebelum menghisap darh dan berwarna merah setelah menghisap darah dari induk semangnya.
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