Purwanto, Harjuna Arif and Ir.Heri Suprijanto,, MS., and Dr.Eng.Tri Budi Prayogo,, ST., MT., (2021) Studi Perencanaan Ulang Bendung Di Daerah Irigasi Rawaan Kabupaten Lumajang Jawa Timur. Sarjana thesis, Universitas Brawijaya.
Abstract
Bendung Rawaan merupakan bendung tetap yang digunakan sebagai penyedia air irigasi di Daerah Irigasi Rawaan. Kondisi saat ini, debit pengambilan dari bendung yang seharusnya dapat melayani area irigasi seluas 354,10 ha seringkali tidak tercapai. Penyebab utamanya adalah dimensi bendung yang seharusnya 25,00 , meter, kini tersisa 7,00 meter. Selain itu terjadi kerusakan pada bangunan pelengkap di area bendung. Berdasarkan penyelidikan geologi, kerusakan yang terjadi disebabkan oleh aliran debris berupa batuan bolder yang mengalir bersama aliran banjir, sehingga bangunan utama Bendung Rawaan tidak dapat menahan gaya yang bekerja terhadap bangunan. Studi ini akan membahas tentang perencanaan ulang bangunan utama bendung, sehingga dapat mengoptimalkan pelayanan irigasi di Daerah Irigasi Rawaan. Analisis hidrologi untuk debit banjir rancangan menggunakan metode HSS Gama I. Hasil debit banjir rancangan kala ulang 100 tahun, yang digunakan untuk desain bangunan utama bendung, didapatkan sebesar 318,51 m³/detik. Sedangkan perhitungan debit andalan menggunakan metode F.J.Mock. Hasil perhitungan debit andalan digunakan untuk mengetahui neraca air yang terjadi sepanjang tahun dan untuk perhitungan debit yang masuk melalui bangunan pengambilan. Berdasarkan perbandingan antara debit andalan dan debit kebutuhan, didapatkan bahwa terjadi defisit air pada periode Agustus II sampai dengan November I. Sesuai dengan desain hidrolis perencanaan bangunan utama, Bendung Rawaan memiliki lebar bendung 22,60 meter dan tinggi 1,60 meter dengan mercu tipe bulat berjari-jari 0,75 meter. Sedangkan peredam energi tipe bucket yang direncanakan berjari-jari 8,00 meter. Dalam pengecekan keamanan bendung terhadap bahaya guling, geser, dan penurunan tanah, kondisi yang diperhitungkan adalah kondisi normal-penuh, gempa-penuh, normal-banjir, dan gempa-banjir. Angka keamanan terbesar didapat pada kondisi normal banjir. Sedangkan nilai terkecil terjadi pada kondisi terekstrem, yaitu kondisi gempa-penuh dengan angka keamanan geser: 2,00; guling: 1,89; serta nilai kapasitas dukung pondasi maksimum dan minimum masing-masing 116,11 kN/m² dan 80,56 kN/m². Konstruksi Bendung Rawaan direncanakan menggunakan beton K-175 yang dilapisi beton bertulang K-300 dengan tulangan utama D16-250 dan tulangan bagi D13-250.
English Abstract
Rawaan Weir is a permanent weir that is used as an irrigation provider in the Rawaan Irrigation Area. Current conditions, the intake discharge from the weir which should be able to serve an irrigation area of 354.10 ha is often not achieved. The main reason is that the dimensions of the weir, which should have been 25.00 meters, are now 7.00 meters. In addition, there was damage to complementary buildings in the weir area. Based on geological investigations, the damage caused by the flow of rock debris in the form of a bolder that flows with the flood, so that the main building of the Rawaan Weir cannot withstand the forces acting on the building. This study will discuss the re-planning of the main building of the weir, so as to optimize irrigation services in the Rawaan Irrigation Area. The hydrological analysis for the design flood discharge used the HSS Gama I method. The result of the 100 year return design flood discharge, which was used for the main building design of the weir, was 318.51 m³/second. While the mainstay discharge calculation uses the F.J. Mock method. The results of the mainstay discharge calculation are used to determine the water balance that occurs throughout the year and to calculate the discharge that enters through the intake building. Based on the comparison between the mainstay discharge and the demand discharge, it was found that there was a water deficit in the period August II to November I. Based on the hydraulic design of the main building planning, the Rawaan Weir has a width of 22.60 meters and a height of 1.60 meters with a round type lighthouse with a radius of 0.75 meters. Meanwhile, the planned bucket type energy reducer has a radius of 8.00 meters. In checking the safety of the dam against the dangers of overturning, shearing, and subsidence, the conditions taken into account are full-normal, full-earthquake, flood-normal, and earthquake-flood conditions. The greatest safety value is obtained in normal flood conditions. While the smallest value occurs in extreme conditions, namely earthquake-full conditions with shear safety points: 2.00; bolster: 1.89; and the maximum and minimum foundation bearing capacity values are 116.11 kN/m² and 80.56 kN/m², respectively. The construction of the Rawaan Dam is planned to use K-175 concrete covered with K-300 reinforced concrete with D16-250 main reinforcement and D13-250 reinforcement.
Other obstract
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| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | 052107.... |
| Uncontrolled Keywords: | bendung, hidrologi, desain hidrolis, stabilitas, beton bertulang, Weir, hydrology, hydraulic design, stability, reinforced concrete |
| Subjects: | 600 Technology (Applied sciences) > 627 Hydraulic engineering > 627.5 Reclamations, Irrigation, related topics > 627.52 Irrigation |
| Divisions: | Fakultas Teknologi Pertanian > Keteknikan Pertanian |
| Depositing User: | Nur Cholis |
| Date Deposited: | 27 Jan 2022 02:38 |
| Last Modified: | 30 Sep 2024 07:19 |
| URI: | http://repository.ub.ac.id/id/eprint/188931 |
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