Studi Alokasi Air Bendungan Merangin di Provinsi Jambi

Kalanie, Ameera (2025) Studi Alokasi Air Bendungan Merangin di Provinsi Jambi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Bendungan Merangin terletak di Sub DAS Merangin, Wilayah Sungai Batanghari, Kabupaten Merangin, Jambi. Bendungan Merangin dirancang sebagai penyedia air untuk Pembangkit Listrik Tenaga Air (PLTA), irigasi, serta air baku. Seiring dengan pertumbuhan jumlah penduduk di Kabupaten Merangin, kebutuhan akan energi, hasil pertanian, dan air bersih mengalami peningkatan yang signifikan. Oleh karena itu, studi alokasi air bendungan menjadi penting untuk menganalisis setiap pemasukan dan pengeluaran debit yang akan tersedia. Tahapan penelitian ini mencakup analisis ketersediaan air, perhitungan kebutuhan air untuk PLTA, irigasi, dan air baku, analisis neraca air, serta simulasi pengoperasian bendungan. Dalam penelitian ini, debit andalan Bendungan Merangin diperoleh melalui perhitungan menggunakan metode F. J. Mock dan dibangkitkan untuk lima tahun ke depan dengan metode Thomas Fiering, yang menghasilkan debit maksimum sebesar 251,77 m³/detik dan debit minimum sebesar 0 m³/detik. Kebutuhan air irigasi maksimum pada awal masa tanam Desember II dengan luas daerah irigasi seluas 7.054 Ha tercatat sebesar 3,5 m³/detik, sedangkan kebutuhan minimum sebesar 0,09 m³/detik. Proyeksi kebutuhan air baku domestik selama 50 tahun ke depan diperkirakan mencapai 56.318,13 m³ per hari, sedangkan kebutuhan air baku non-domestic sebesar 13.649,23 m³ per hari. Debit andalan 90% sebesar 1,45 m³/detik dimanfaatkan untuk perhitungan potensi pembangkitan listrik PLTA, yang dapat menghasilkan daya sebesar 1,02 MW dan energi listrik tahunan hingga 8.975,71 MWh. Berdasarkan analisis kebutuhan air irigasi, kebutuhan air tahunan dengan pola tanam Padi–Padi–Kedelai lebih kecil, yaitu sebesar 33 m³/detik, dibandingkan pola tanam Padi–Padi–Jagung sebesar 34 m³/detik, sehingga kelebihan air dapat dimanfaatkan untuk kebutuhan lainnya. Selain itu, hasil simulasi pengoperasian bendungan menggunakan neraca air menunjukkan bahwa volume tampungan waduk diproyeksikan tetap mencukupi dan tidak mengalami kekosongan hingga enam tahun ke depan
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The Merangin Dam is located in the Merangin Sub-Watershed, Batanghari River Basin, Merangin Regency, Jambi. The Merangin Dam is designed to supply water for hydroelectric power plants (PLTA), irrigation, and raw water. With the growth of the population in Merangin Regency, the demand for energy, agricultural products, and clean water has increased significantly. Therefore, a dam water allocation study is crucial to analyze the inflow and outflow of available water. The research stages include water availability analysis, calculation of water requirements for the PLTA, irrigation, and raw water supply, water balance analysis, and dam operation simulation. In this study, the reliable flow rate of the Merangin Dam was obtained through calculations using the F. J. Mock method and projected for the next five years using the Thomas Fiering method, resulting in a maximum flow rate of 251.77 m³/second and a minimum flow rate of 0 m³/second. The maximum irrigation water requirement at the beginning of the December II planting season, with an irrigated area of 7,054 hectares, was recorded at 3.5 m³/s, while the minimum requirement was 0.09 m³/s. The projected domestic raw water demand over the next 50 years is estimated to reach 56,318.13 m³ per day, while the non-domestic raw water demand is 13,649.23 m³ per day. The 90% reliable flow rate of 1.45 m³/second is utilized for calculating the potential for hydroelectric power generation, which can produce 1.02 MW of power and up to 8,975.71 MWh of annual electricity. Based on irrigation water demand analysis, the annual water demand for the Rice–Rice–Soybean cropping pattern is smaller, at 33 m³/second, compared to the Rice–Rice–Corn cropping pattern at 34 m³/second, so the excess water can be utilized for other needs. Additionally, simulation results of dam operations using a water balance indicate that the reservoir's storage volume is projected to remain sufficient and will not experience depletion for the next six years.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bendungan Merangin, Irigasi, PLTA, Air Baku, Alokasi Air, Merangin Dam, Irrigation, Hydropower, Raw Water, Water Allocation
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs T Technology > TC Hydraulic engineering. Ocean engineering > TC555 Spillways. Energy dissipation. Hydraulic jump. T Technology > TC Hydraulic engineering. Ocean engineering > TC812 Irrigation
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	Ameera Kalanie
Date Deposited:	29 Jul 2025 03:49
Last Modified:	29 Jul 2025 03:49
URI:	http://repository.its.ac.id/id/eprint/122529

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