Perhitungan debit banjir rencana merupakan suatu bagian yang sangat penting dalam merencanakan bangunan air. Dengan perencanaan debit banjir yang tepat dan sesuai akan menyebabkan pembangunan sarana prasarana keairan menjadi efektif dan efisien serta dapat mengurangi resiko akan kegagalan bangunan akibat bencana alam seperti banjir. Selain pemilihan periode ulang rencana yang tepat sesuai dengan resiko yang akan dihadapi oleh suatu bangunan keairan, dalam perhitungan debit banjir rencana juga diperlukan metode yang tepat untuk dapat menggambarkan hidrograf yang sesuai dengan karakteristik suatu daerah aliran sungai (DAS) dimana suatu bangunan keairan tersebut akan dibangun. Sub DAS Konto, salah satu anak Sungai Brantas, yang merupakan sungai besar dan penting di Jawa Timur. Sehingga keberadaan debit airnya juga sangat menentukan kebermanfaatannya untuk kehidupan masyarakat sekitar. Didalam penelitian akan menggunakan metode Nakayasu dan ITB yang dibandingkan dengan hasil pengukuran debit di lapangan.
The landslides in the field often do not have an infinite length, making 3-dimensional assumptions more appropriate for the design. Meanwhile, they are mostly analyzed in design by assuming the landslides occur infinitely with plane strain in a 2dimensional approach. This assumption becomes less precise due to the consideration of the safety factor based on 2-dimensional conditions while the landslide happens 3-dimensional, and this has further effects on the need for reinforcement. This research was conducted to determine the level of influence 2-dimensional and 3-dimensional landslide safety factors have on the number of reinforcements required. A limit equilibrium method was used in the study. The number of geotextile reinforcement needs with a 3dimensional sliding model is calculated based on existing research results. The results are then compared with the amount of geotextile reinforcement required with a 2-dimensional sliding model. The results showed the possibility of having the same amount of reinforcement under 2-D and 3-D assumptions in the homogeneous soil, while different results were found with heterogeneous soil layers due to the variations in soil conditions. Comparison of the number of geotextile reinforcement requirements between 2 dimensions and three dimensions still needs to be further developed by using more varied soil data. This is done considering that existing studies are only limited to soil, which tends to be homogeneous.
Waduk Way Apu terletak di aliran Sungai Way Apu dan masuk wilayah Kecamatan Waeapo di Pulau Buru, Provinsi Maluku. Secara geografis sesuai dengan koordinat UTM, Waduk Way Apu terletak di koordinat X = 260630,764 dan Y = 9608598. Waduk Way Apu mampu mengairi 5726 ha sawah padi. Waduk Way Apu direncanakan mampu untuk memenuhi kebutuhan irigasi, air baku, dan potensi PLTA. Sehubungan dengan permasalahan tersebut diatas, perlu adanya studi optimasi Waduk Way Apu untuk pemanfaatan irigasi, kebutuhan air baku, dan potensi PLTA. Dengan adanya studi optimasi dapat diketahui pengaturan cara pemberian air yang baik dan pengaturan pola tanam. Hal tersebut ditindaklanjuti dengan studi optimasi antara pola tanam dan kebutuhan air baku serta potensi PLTA sehingga fungsi dari Waduk Way Apu dapat digunakan secara optimal. Untuk analisa ini digunakan program linier dengan program bantu POM-QM for Windows 3. Dari hasil analisa yang telah dilakukan, didapatkan beberapa kesimpulan yaitu Debit andalan yang digunakan untuk menghitung besar kebutuhan air adalah Debit Andalan 80% terbesar adalah 21.27 m 3 /detik dan Debit Andalan 80% terkecil adalah 0.95 m 3 /detik, Alternatif Pola Tanam yang paling optimal adalah Alternatif Pola Tanam 1 dengan masa awal tanam Nopember 1, besar kebutuhan air untuk kebutuhan air baku pada tahun 2012 pada kondisi jam puncak adalah sebesar 44.67 liter/detik, dan besar energi yang dihasilkan dari perhitungan potensi PLTA didapatkan daya sebesar 152.16 kW dengan Debit Andalan 90% sebesar 2.47 m 3 /detik.
This research was conducted to analyze balancing the storage capacity of the Bendo Reservoir with the quantity of water needed. Bendo Reservoir located in Nginden Sawo Village, Ponorogo Regency is one of the multipurpose reservoirs in Indonesia designed for irrigation, water supply, and simultaneously hydroelectric power. The water available is observed to be decreasing along with climate change, thereby, requiring an appropriate reservoir operational system. Several methods have been designed to achieve this purpose through the use of vast and complex variables but this study used a Dynamic Systems approach for analysis. Hhowever, involved the use of two scenarios in the simulation model to obtain the most optimum results. A period of 5 years was simulated and the result showed water shortage started in the 54th month for scenario 2, 49th month for scenario 1, and 46th month for the base model. Therefore, means scenario 2 has the most optimum conditions and recommended as the appropriate solution for Bendo Reservoir water distribution.
Padi Pomahan Irrigation Area has a lack of sufficient amount of water at the downstream area in dry season. This problem is caused by some factors such as the exploitation of drinking water, climate change, land use change, and the damage of irrigation channel. The performance of irrigation channel and its facilities compared with the situation nearly 20 years later has never been evaluated and measured due to the limited of the preliminary data. With the area of 4309 hectares managed by two offices (UPT Pugeran and UPT Tangunan), the coordination become more complex to manage the irrigation water in this area. This paper aims to analyze the irrigation performance at tertiary level to measure the performance of six indicators/criterions such as physical infrastructure, plant productivity, personnel organization, operation and maintenance (OM), documentation, and institutional condition of water user associations (P3A / GP3A / IP3A). The results of its performance are expected to obtain the handling priority at the tertiary level in this irrigation system by Indonesian government. The total irrigation performance In Padi Pomahan obtains 61.0%. The result model of AHP (Analytic Hierarchy Process) obtains the result of personnel organization 28.9% (rank 1), plant productivity 20.3% (rank 2), physical infrastructures 16.8% (rank 3), operation and maintenance (OM 14.2% (rank 4), institutional condition of water user associations (P3A / GP3A / IP3A) 10.5% (rank 5) and documentation 9.3% (rank 6). The ARP model obtains CGI value 0.13 and Consistency Ratio (CR) 0.036.
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