22 research outputs found

    DESAIN KOLAM PEREDAM ENERGI BENDUNG PLAOSAN KABUPATEN SEMARANG

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    Hydraulic aspect of the weir is important factors in planning a stilling basin. Remaining energy on the stilling basin is expected to be as minimal as possible so that scour does not occur on the river bed. Plaosan Weir does not yet have a stiiling basin structure. Therefore it is necessary to recommend the design of stiliing basin.The analysis carried out hydrological analysis, including calculating return period rainfall, flood discharge (Q) using the Haspers method, and calculating Froude number (Fr) to determine pond type. Based on the recommendations for the type of stilling basin, a building design is carried out and also stability of design..From the results of calculation it is obtained that 50-year return period rainfall is 108.68 mm. Planned discharge for 50 years is 186.06 m3/s, and froude number : 4. The appropriate type of stilling basin is USBR Type IV. The pond is planned to have a length of L = 17 m, with a block face width of 0.68 m, height of 1.36 m, distance between front blocks of 1.69 m and total of 13 pieces. The results of stability control analysis during normal water conditions and flood water conditions produce values above the safety factor so that it can be concluded that the design is planned qualify

    STATISTIKA DESKRIPTIF T-TEST UNTUK MEMPERMUDAH PEMILIHAN DATA DARI HASIL PENGUJIAN BETON MENGGUNAKAN SPSS 16.0

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    This study discusses the application of descriptive statistics in the world of construction projects to analyze and interpret the data under study. Considering that time is a crucial thing in the project, it is necessary to have auxiliary tools to increase the time usage effectively for all important elements in the construction project. One of them is to shorten the time to analyze research results from testing concrete or concrete mixtures with case studies. To achieve maximum results, it takes a lot of samples that produce a lot of data. Hence, this study tries to use T-Test analysis of descriptive statistics which can help compare related groups to find out whether there are differences between groups. The results of the case study showed that there was no significant difference between concrete with normal mixture and other mixtures. Thus, the results of the study analysis can be concluded immediately whether the quality of the concrete according to the design criteriaKeywords: Descriptive Statistic, T-Test, The Quality of concret

    EVALUASI UMUR LAYANAN WADUK SANGGEH

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    Waduk Sanggeh merupakan salah satu wujud usaha pengelolaan Sumber Daya Air yang berlokasi di desa Tambirejo, Kecamatan Toroh, Kabupaten Grobogan. Waduk Sanggeh dibangun antara tahun 1909-1911, dengan luas genangan waduk Sanggeh 13 ha dibangun dengan tujuan untuk mengairi sawah seluas 46 ha. Salah satu persoalan utama yang terjadi di dalam operasional Waduk Sanggeh adalah terjadinya sedimentasi yang berakibat pada pengurangan kapasitas waduk sehingga berdampak terhadap umur layanan waduk yang sudah direncanakan. Maka perlu dilakukan penelitian untuk memperkirakan umur layanan waduk berdasarkan laju sedimentasi Waduk Sanggeh pada kondisi saat ini. Analisis erosi dan sedimentasi diperlukan guna menentukan sisa umur waduk. Prediksi laju erosi dilakukan dengan analisis USLE untuk menghasilkan tingkat erosi lahan. Analisis Sediment Delivery Ratio (SDR) menghasilkan laju sedimen yang masuk ke Waduk Sanggeh. Volume sedimen yang mengendap di dalam waduk dapat diprediksi dengan cara mencari besarnya trap efficiency. Prediksi sisa umur layanan waduk dapat dikomparasi dari hasil perhitungan secara empiris dengan hasil pengukuran bathimetri. Sesuai dengan tujuan penelitian, hasil penelitian ini dapat memprediksi tingkat sedimentasi, dan memprediksi sisa umur layanan waduk selama 9 tahun, sesuai dengan maksud dan tujuan penelitian. Diharapkan hasil penelitian ini dapat digunakan untuk menyusun pedoman operasi dan konservasi lahan DTA waduk, terutama Waduk Sanggeh

    REKAYASA PERLINTASAN SUNGAI BRINGIN DAN JALAN TOL SEMARANG-BATANG

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    Trase jalan tol Semarang-Batang pada Sta 444+881 melintasi Sungai Bringin yang beralur meander sepanjang 667,45 m. Untuk melintasi Sungai Beringin, ada 3(tiga) alternatif perlintasan jalan tol yang diusulkan dalam studi ini. Alternatif perlintasan ke I adalah menggunakan jalan layang, ke II pemindahan alur sungai, dan yang ke III adalah kombinasi antara jembatan layang dan pembangunan embung. Sungai Bringin adalah sungai yang dapat dikategorikan sebagai sungai yang garang, karena itu masing-masing alternatif tersebut perlu dikaji pengaruhnya pada morfologi sungai, dan lingkungan daerah hilirnya. Analisis yang dilakukan dalam studi ini antara lain analisis hidrologi untuk memprediksi debit banjir, analisis hidrolika untuk melihat pengaruh aliran banjir dan analisis multi kriteria untuk memilih alternatif yang terbaik berdasarkan beberapa kriteria. Analisis hidrologi menggunakan HEC-HMS untuk menganalisis volume kolam embung, lebar bangunan pelimpah, tinggi muka air banjir dan elevasi puncak bendungan. Analisis hidrolika dilakukan dengan HEC-RAS untuk mengkaji tinggi muka air dan kecepatan aliran. Pemilihan alternatif dalam pengambilan keputusan dilakukan dengan kajian analisis multikriteria “Weighted Average” yang paling sederhana agar analisisnya mudah diikuti oleh pihak-pihak yang berwenang mengambil keputusan. Penelitian ini bermanfaat untuk menentukan alternatif yang terbaik berdasarkan aspek hidrologi, hidrolika, morfologi sungai, waktu dan biaya pelaksanaan

    PENINGKATAN JARINGAN IRIGASI DAERAH IRIGASI KRIPIK KOTA SEMARANG

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    Water is a very basic need for All living things on this earth without exception. The Kripik River is currently not being utilized by community optimally. For this reason, it is necessary to increase Irrigation Area which aims to increase agricultural production. Currently, the Bendung Kripik area serves an irrigation area of 95,94 Ha with the height of the exsisting weir lighthouse is 1 m.The improvement of the irrigation network is carried out based on secondary data with other supporting data. The analysis carried out includes: hydrological analysis which includes : watershed, maximum rainfall, flood discharge, average rainfall, average climatology, Eto – Penman, F.J Mock mainstay discharge, planting patterns then carried out channel design, weir design and calculation of weir stability.In this study, it was proposed to increase the rice field area by 130.17 Ha From the results of hydrological analysis, the flood discharge value of the Nakayasu Synthetic Unit Hydrograph (HSS) method was obtained when repeating 100 th by 40.10 m3 / s. The water requirement for irrigation of D.I Kripik after the addition of the area is 0.086 m3 / s. As for the bed, a weir width of 30 m with a weir height of 1.05 m is required, a weir lighthouse width of 28 m, a rinse width of 1 m and a pillar width of 1 m (2 Pillars of 1 m each). The radius of the spherical threshold type weir is 0.5 m, the olak pond type is USBR Type IV with a length of 3.50m. Keywords: Irrigation, Weir, Flood Discharg

    PERENCANAAN ULANG VOLUME EMBUNG PUSPORENGGO KECAMATAN MUSUK KABUPATEN BOYOLALI

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    Pusporenggo Smalldam was built in Pusporenggo Village, Musuk District, Boyolali Regency. This reservoir was built to meet the needs of raw water Pusporenggo Village.The analyzes carried out include: analysis of watershed area, analysis of raw water needs and calculation of reservoir volume. From the analysis, watershed area of Pusporenggo Smalldam  is 0.339 km² with a river length of 1,281 km. Sediment volume: 15,083.61m³, infiltration volume: 26,101.97m³, evaporation volume: 1,436.55m, volume of raw water requirement: 104,407.88m³. From the volume calculation, it is known that the Pusporenggo Reservoir requires a reservoir volume of: 147.030.00m³. As for the initial design, the Pusporenggo Embung is planned with a spillway elevation of +501.50 and a volume of 234.532.60m³. It can be concluded that this reservoir can be used to fulfill water requirement for other areas.

    Analisis Multi Kriteria Pos Hujan dan Pos Debit dengan Metode Stepwise pada DAS Bd. Katulampa

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    Abstrak:Dalam suatu WS/DAS, pos pencatatan curah hujan biasanya lebih banyak ditemui dibandingkan dengan pos pencatatan debit. Banyaknya jumlah pos hujan menimbulkan permasalahan dalam biaya operasi dan pemeliharaan. Penelitian ini bertujuan untuk menentukan pos hujan yang paling berpengaruh pada DAS Bd. Katulampa. Analisis dilakukan dengan metode Stepwise yang merupakan analisis multi correlation, dalam hal ini data hujan bulanan sebagai variabel bebas dan data debit bulanan sebagai variabel tidak bebas. DAS Bd. Katulampa dipengaruhi oleh 13 pos hujan. Akan tetapi karena keterbatasan data, analisis dilakukan pada 5 Pos Hujan yaitu Pos Perkeb. Gn. Mas, Pos Gunung Mas, Pos Panjang, Pos Pasir Muncang dan Pos Katulampa. Hasil analisa dengan multi correlation menunjukkan bahwa pertambahan nilai korelasi bertambah dari kombinasi 2,3 dan 4 pos hujan. Akan tetapi pada kombinasi 5 pos hujan, pertambahan nilai korelasi tidak lagi signifikan. Hal ini bisa disimpulkan bahwa pada DAS Bd. Katulampa, pencatatan pos hujan cukup terwakili dengan kombinasi 4 pos hujan antara lain Pos Perkeb. Gn. Mas, Pos Panjang, Pos Pasir Muncang dan Pos Katulampa. Kombinasi 4 pos hujan ini kemudian di cek dengan standar WMO. Polygon thiessen yang dihasilkan 4 pos hujan hasil analisis, menghasilkan luas pengaruh pos hujan maksimum adalah 50.57 km2 yaitu Pos Pasir Muncang dan minimum 15.46 km2 Pos Katulampa. Artinya dengan 4 pos hujan tersebut, luas pengaruh pos hujan masih masuk dalam ketentuan yang disyaratkan oleh WMO.Kata-kata kunci: pos hujan, pos debit, multi correlation, stepwiseAbstract:In a WS / DAS, the rainfall recording post is usually more common than the debit recording post. The large number of rain stations has caused problems in operating and maintenance costs. This study aims to determine the most influential rainfall items in the watershed Bd. Katulampa. The analysis was carried out using the Stepwise method which is a multi correlation analysis, in this case monthly rainfall data as the independent variable and monthly discharge data as the dependent variable. DAS Bd. Katulampa is affected by 13 rain posts. However, due to data limitations, the analysis was carried out on 5 Rain Posts, namely Perk Perkeb. Mt. Mas, Gunung Mas Post, Pos Panjang, Muncang Sand Post and Katulampa Post. The results of the analysis with multi correlation show that the correlation value increases from the combination of 2.3 and 4 rain posts. However, in the combination of 5 rain posts, the correlation value is no longer significant. It can be concluded that in the watershed Bd. Katulampa, the recording of rain posts is adequately represented by a combination of 4 rain posts, including the Pos Perkeb. Mt. Mas, Long Post, Muncang Sand Post and Katulampa Post. The combination of the 4 rain posts is then checked with the WMO standard. Polygon Thiessen produced by 4 analysis results, the maximum area of influence is 50.57 km2, that is Pasir Muncang Post and minimum 15.46 km2 Katulampa Post. This means that with the 4 rain posts, the broad influence of the rain post is still included in the conditions required by the WMO.Keywords: rain post, debit post, multi correlation, stepwise

    FORMULASI SEDIAAN KRIM ANTIOKSIDAN EKSTRAK ETANOL LABU KUNING (Cucurbita moschata Duch)

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    Latar belakang: Antioksidan merupakan senyawa yang bereaksi dengan radikal bebas dan mendonorkan elektron sehingga radikal bebas menjadi stabil. Buah labu kuning (Cucurbita moschata Duch) berpotensi sebagai antioksidan memiliki senyawa flavonoid dapat membentuk radikal fenoksi yang stabil pada proses oksidasi. Ekstrak buah labu kuning dibuat sediaan krim antioksidan. Penelitian ini bertujuan untuk mengevaluasi karakteristik fisik dan stabilitas mekanik krim ekstrak buah labu kuning dengan variasi konsentrasi ekstrak 0,04%, 0,1%, 0,16%, serta aktivitas antioksidan sediaan yang dinyatakan dalam nilai IC50. Metode: Penelitian ini menggunakan metode eksperimental laboratorium. Sediaan krim dibuat dengan variasi konsentrasi ekstrak sebesar 0,04% (F1), 0,1% (F2), 0,16% (F3). Uji aktivitas antioksidan dilakukan menggunakan metode ABTS. Analisis data dilakukan dengan SPSS 23. Hasil: Hasil evaluasi sediaan krim yaitu uji organoleptis berbau khas, bentuk semi padat, tidak berasa, warna formula I putih kekuningan, formula II kuning cerah, formula III kuning, uji homogenitas homogen, tipe krim (M/A), pH 6, viskositas (3.600-12.120 cP), daya sebar (4,5-6,5 cm), daya lekat (4,6-6,8 detik), daya proteksi (2,1-5,6detik), uji stabilitas mekanik krim tidak memisah. Nilai IC50 ekstrak buah labu kuning sebesar 61,90 ppm (kuat), krim formula I 74,57 ppm (kuat), formula II 65,27 ppm (kuat), krim formula III 63,4 ppm (kuat), larutan pembanding vitamin C 4,46 ppm (sangat kuat). Kesimpulan: Krim ekstrak buah labu kuning memiliki mutu fisik dan stabilitas mekanik yang baik dan memenuhi syarat. Krim buah labu kuning dengan variasi konsentrasi ekstrak 0,04%, 0,1%, 0,16% memiliki nilai IC50 sebesar 74,57 ppm, 65,27 ppm, 63,42 ppm serta konsentrasi ekstrak paling efektif sebagai antioksidan adalah 0,16% (F3). Kata kunci: Antioksidan, Buah labu kuning, ABTS, Kri

    Pengaruh Land Subsidence terhadap Genangan Banjir dan Rob di Semarang Timur

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    Inundation of flood and rob (flood due to high tides) in Semarang City is increase wtithin area and depth. It be more seroius condition because of land subsisdence that happened in coastal area of Semarang City. This research is foccused on prediction and mapping of inundation flood and rob due to land subsidence effect in East Semarang, especially Tenggang Watershed and Sringin Watershed. On this research, data analysis including analysis of land subsidence, analysis of hydrological data, analysis of flood discharge with HEC-HMS, hydraulics analysis with HEC-RAS and then mapping the results of the flood inundation with Arc GIS. The inundation will be create with overlay the DEM of flood water level and DEM of topographic. According to the results of analysis is known that minimum land subsidence is 0 cm/year that happened in south area of Semarang and more higher ini north area with maximum land subsidence is 5.58 cm/year. On periode   2014-2031, the contribute of land subsidence to increase the inundation of flood and rob is 1.39%/year

    PENGARUH EFIKASI DIRI AKADEMIK TERHADAP HASIL BELAJAR MATEMATIKA TENTANG SOAL CERITA OPERASI HITUNG CAMPURAN

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    The purpose of this study is to determine the effect of academic self efficacy on math learning outcomes particularly in solving mixed word problems. The study was conducted at SDN Pinang Ranti 04 Pagi, East Jakarta, in January 2013. Employing ex-post facto method, the study selected 32 students of the third grade. The data were collected using questionnaires and descriptive test and analyzed by t-test for the hypothesis. The results indicate positive significant influence of academic self efficacy on the learning outcomes in math mixed word problems. The implications of this research is high academic self efficacy needs to have as it gives effect to the students’ academic success. The students can enhance their academic self efficacy by increasing self efficacy experiences, observations on the other people’s success. The teachers and parents can help the students to their academic self efficacy by providing encouragement. The students’ learning outcomes can be influenced by internal and eksternal factors
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