Judul: The Sabo Dam Design as an Evaluation of the Water Quality of the Nadya Krenceng Reservoir
Abstrak: Waduk Nadra Krenceng dibuat untuk menampung air Sungai Kapudenok dan sungai Brambang. Seiring jalanya waktu, penggunaan lahan yang menyebabkan perubahan tutupan lahan yang menyebabkan erosi pada DAS Krenceng dan pembuangan limbah industri menyebabkan adanya penurunan kualitas air waduk Nadra Krenceng Waduk Nadra Krenceng mengalami laju erosi mencapai 36.946 ton/tahun atau setara 984 m3/tahun yang membuat terjadinya pencemaran air yang dilihat dari parameter warna, Padatan tersuspensi total (TSS), Padatan terlarut total (TDS), dan Warna. Sabo Dam dibangun untuk mengurangi sedimen yang masuk. Rancangan Sabo dam sebagai pengendali sedimen didapat sedimen yang dapat ditampung dalam sabo dam sebesar 41378.66 m3 dengan debit banjir debit rencana 50 tahun 95.91 m3/det). panjang lantai apron (L) sebesar 22 m. Tinggi efektif dari sabo dam didapat 8 m dan besar, The Nadra Krenceng Reservoir was made to accommodate the water of the Kapudenok and Brambang rivers. Over time, land use causes changes in land cover which causes erosion in the Krenceng watershed and industrial waste disposal causes a decrease in the water quality of the Nadra Krenceng reservoir. water as seen from the color parameters, total suspended solids (TSS), total dissolved solids (TDS), and color. Sabo Dam was built to reduce incoming sediment. The design of the sabo dam as a sediment controller obtained sediment that can be accommodated in the sabo dam of 41378.66 m3 with a planned 50 year flood discharge discharge of 95.91 m3/s). apron floor length (L) of 22 m. The effective height of the sabo dam is 8 m and the width of the base of the spillway is 39.17 m, the width of the top of the spillway is 40.57 m..
Keyword: DAS Krenceng, Sabo Dam, Waduk Nadra Krenceng, Krenceng Watershed, Sabo Dam, Nadra Krenceng Reservoir

Judul: Evaluation of Service Life of Kadumalik Reservoir - Majalengka Regency, West Jabar
Abstrak: Waduk Kadumalik merupakan proyek strategis nasional yang berada di dua Kabupaten, yakni Kabupaten Sumedang dan Kabupaten Majalengka dengan tujuan pembangunan untuk kebutuhan air irigasi, penyediaan air baku Kabupaten Majalengka dan pembangkit listrik tenaga air (PLTA). Permasalahan yang sering dihadapi waduk – waduk yang ada di Indonesia pada umumnya adalah tingginya laju sedimentasi sebagai akibat dari meningkatnya laju erosi permukaan, maupun erosi tebing di daerah hulu atau daerah pengaliran sungainya. Hal ini menimbulkan dampak negatif yaitu menurunkan efektivitas dan daya tampung waduk sehingga dapat mempengaruhi umur layanan waduk. Berdasarkan hasil analisis dengan menggunakan metode prediksi efisiensi tangkapan, Waduk Kadumalik diprediksikan hanya mencapai umur 10 tahun layanan. Tujuan penelitian ini yaitu untuk menghitung prediksi besarnya sedimentasi yang terkumpul pada Waduk Kadumalik dengan menggunakan pemodelan SWAT+ dan mengevaluasi umur layanan berdasarkan analisis volume tampungan mati (dead storage) dan hasil pemodelan output SWAT+. Berdasarkan perhitungan dengan metode kapasitas tampungan mati (dead storage) yang diukur menggunakan aplikasi Surfer, umur layanan Waduk Kadumalik yaitu 13,7 tahun dengan laju sedimentasi 789.617 ton/tahun. Dengan melakukan modifikasi tutupan lahan, umur layanan Waduk Kadumalik menjadi 14,59 tahun dengan nilai laju sedimentasi 740.817 ton/tahun. Hasil tersebut diambil dari skenario yang menghasilkan sedimentasi yang paling rendah yaitu di skenario kedua. Pada skenario kedua ini ada perubahan tutupan lahan dari tegalan (AGRL) menjadi hutan rimba (FRSE) sehingga tutupan lahan hutan rimba menjadi 30% dari tutupan lahan di Sub DAS Cilutung. Namun pada skenario ketiga tutupan lahan hutan rimba (FRSE) menjadi 40% dan simulasi SWAT+ menghasilkan sedimentasi yang lebih tinggi dari pada skenario kedua. Hal ini dikarenakan pada skenario ketiga tutupan lahan tegalan (AGRL) tersisa 10% sehingga hutan campuran (FOMI) yang kemudian diubah ke hutan rimba (FRSE)., Kadumalik Reservoir is a national strategic project located in two regencies, namely Sumedang Regency and Majalengka Regency, aiming to provide irrigation water and water supply for Majalengka Regency and hydroelectric power plant. The problem common for the reservoirs in Indonesia, in general, is the high sedimentation rate due to the increasing rate of land erosion and cliff erosion. This has a negative impact, namely reducing the effectiveness and capacity of the reservoir so that it can affect the lifetime of the reservoir. Based on the analysis results using the predictive method of catch efficiency, the Kadumalik Reservoir is predicted only reach ten years of service life. The purpose of this study is to calculate the prediction of the amount of sedimentation collected in the Kadumalik Reservoir using SWAT+ modeling and evaluating the service life based on the analysis of dead storage volume and SWAT+ output modeling results. Based on calculations using the dead storage capacity method measured using the Surfer application, the service life of the Kadumalik Reservoir is 13,7 years with a sedimentation rate of 789.617 tons/year. By modifying the land cover, the service life of the Kadumalik Reservoir becomes 14,59 years with a sedimentation rate of 740.817 tons/year. The results are taken from the scenario that produces the lowest sedimentation, namely the second scenario. On the second scenario there a change in land cover from dry land (AGRL) to the evergreen forest (FRSE) so that the forest
Keyword: SWAT+, umur layanan, Waduk Kadumalik

Judul: Distribution and Diversity of Ectoparasite Mites on Geckos in Indonesia
Abstrak: Data on the diversity and dispersal of parasitic mites on house geckos in Indonesia are very scarce. In this work, the distribution and diversity of mites living on three species of house geckos, namely Cosymbotus platyurus, Hemidactylus frenatus, and H. garnotii collected throughout Indonesia, has been elaborated. Geckos and mites were captured and immediately preserved in 70% ethanol. Whole mount of the mites was prepared by clearing in lactophenol followed by mounting on polyvinyl lactophenol solutions. The SEM preparation was conducted to examine the detail morphological characters of the mites. The results showed that among 448 individuals of geckos, 221 geckos were infected by Geckobia mites. Prevalences of C. platyurus, H. frenatus, and H. garnotii infested by mites were 14.8%, 50.69%, and 79.6%, respectively. Three different spesies of Geckobia (G1, G2, and G3) could be differentiated; and based on similarities of their morphological characters to ones described in published literatures, Geckobia G2 is Geckobia glebosum and Geckobia G3 is Geckobia bataviensis while G1 could not be identified to the species level. The highest mean intensity of Geckobia G1 infestation was found on H. garnotii (I=7.0), G. glebosum infestation on H. frenatus (I=3.5), and G. bataviensis infestation on H. garnotii (I=11.8). In general, C. platyurus was infested by the least number of mites. Geckobia G1 were found living on the skin folds on the claws, G. glebosum were found mainly on the body and thigh, and G. bataviensis were found on almost all parts of the host’s body. Geckobia mites are distributed randomly throughout Indonesian Archipelago, following the pattern of distribution of their hosts. So it is concluded that Geckobia G1, G. glebosum, and G. bataviensis are sympatric.
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