Optimasi Pemanfaatan Air Bendungan Bendo dan Sungai Suplesi Untuk Peningkatan Indeks Pertanaman Pada Daerah Irigasi Bendo, Kabupaten Ponorogo, Jawa Timur

Fitriansyah, Moch Ferry Dwi (2026) Optimasi Pemanfaatan Air Bendungan Bendo dan Sungai Suplesi Untuk Peningkatan Indeks Pertanaman Pada Daerah Irigasi Bendo, Kabupaten Ponorogo, Jawa Timur. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Daerah Irigasi (DI) Bendo (3.243 ha) memperoleh pasokan air dari Bendungan Bendo dan tiga sungai suplesi di hilirnya. Meski Indeks Pertanaman (IP) eksisting telah mencapai 293% (melampaui target 260%), pemanfaatan sumber daya air belum sepenuhnya optimal akibat fluktuasi kesesuaian antara ketersediaan dan kebutuhan pada setiap periode tanam. Penelitian ini bertujuan untuk memaksimalkan pemanfaatan air tersebut melalui analisis ketersediaan, kebutuhan, neraca air, dan optimasi pola tanam. Analisis ketersediaan air dihitung menggunakan metode F.J. Mock yang dikalibrasi terhadap debit pencatatan. Untuk mengevaluasi keseimbangan alokasi air, simulasi neraca air dilakukan secara bertahap dan sekuensial; menelusuri aliran dari pelepasan Bendungan Bendo menuju enam bangunan bendung di hilirnya dengan mengintegrasikan tambahan debit suplesi. Hasil simulasi ini kemudian dijadikan dasar dalam optimasi pola tanam. Hasil penelitian menunjukkan ketersediaan air andalan Bendungan Bendo pada kondisi normal (Q50%) sebesar 3,9891 m³/detik. Pasokan ini didukung oleh potensi aliran suplesi (Q80%) dari Sungai Sawoo (0,0392 m³/detik), Sungai Sono (0,0109 m³/detik), dan Sungai Kemuning (0,1682 m³/detik). Simulasi neraca air membuktikan bahwa kombinasi pasokan terintegrasi ini mampu memenuhi seluruh kebutuhan air irigasi. Berdasarkan hasil optimasi melalui pergeseran awal masa tanam, IP lahan berhasil ditingkatkan dari 293% menjadi 300%, dan IP padi meningkat signifikan dari 218% menjadi 269%. Selain itu, luas lahan bero (kosong) berhasil ditekan dari 212 Ha menjadi 0 Ha. Hal ini menunjukkan bahwa pengaturan pola tanam berbasis simulasi neraca air mampu memaksimalkan intensitas lahan tanpa mengurangi keandalan pemenuhan air, sehingga direkomendasikan untuk pengelolaan DI Bendo yang lebih berkelanjutan.
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The Bendo Irrigation Area (3,243 ha) receives its water supply from the Bendo Dam and three downstream supplement rivers. Although the existing Cropping Index (CI) has reached 293% (exceeding the 260% target), the utilization of water resources is not yet fully optimal due to fluctuations in the balance between water availability and demand in each planting period. This research aims to maximize water utilization through the analysis of water availability, water requirements, water balance, and cropping pattern optimization. Water availability analysis was calculated using the F.J. Mock method, calibrated against recorded discharge data. To evaluate the water allocation balance, a sequential water balance simulation was conducted; routing the flow from the Bendo Dam release to six downstream weirs by integrating the additional supplement discharge. The results of this simulation were then used as the basis for optimizing the cropping pattern. The results showed that the dependable water availability of the Bendo Dam under normal year conditions (Q50%) is 3.9891 m³/s. This supply is supported by the potential supplement flow (Q80%) from the Sawoo River (0.0392 m³/s), Sono River (0.0109 m³/s), and Kemuning River (0.1682 m³/s). The water balance simulation proved that this integrated supply combination can fulfill the entire irrigation water requirement. Based on the optimization results through shifting the start of the planting season, the land CI was successfully increased from 293% to 300%, and the rice CI significantly increased from 218% to 269%. Additionally, the area of fallow land was successfully reduced from 212 ha to 0 ha. This demonstrates that regulating cropping patterns based on sequential water balance simulations can maximize land utilization intensity without reducing the reliability of water fulfillment, thus highly recommended for a more sustainable management of the Bendo Irrigation Area.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bendo Irrigation Area, Bendo Dam, F.J. Mock, Reservoir Operation Pattern, Cropping Pattern Optimization, Daerah Irigasi Bendo, Bendungan Bendo, F.J. Mock, Neraca air bendungan, Optimasi Pola Tanam.
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC812 Irrigation
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Moch Ferry Dwi Fitriansyah
Date Deposited:	07 Aug 2026 08:42
Last Modified:	07 Aug 2026 08:42
URI:	http://repository.its.ac.id/id/eprint/143676

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