OPTIMALISASI PENGATURAN IRIGASI WADUK SESUAI KEBUTUHAN AIR DAN KETERSEDIAAN AIR WADUK

CAESAR NATANIEL, Drs. Edi Winarko, M.Sc., Ph.D.

2014 | Skripsi | S1 ILMU KOMPUTER

Waduk Sermo merupakan sumber air di wilayah kabupaten Kulon Progo dan sekitarnya, yang dimanfaatkan untuk kebutuhan irigasi air baku, kebutuhan rumah tangga, kebutuhan sentra industri, dan kebutuhan lainnya. Kendala yang dihadapi adalah daya tampung waduk yang semakin menurun, serta kebutuhan air yang semakin meningkat. Oleh karena itu, diperlukan penelitian mengenai optimalisasi pemanfaatan air dari Waduk Sermo, sesuai kebutuhan air dan ketersediaan air waduk, serta sesuai dengan prioritas pengairan, agar dapat mencapai nilai yang optimal. Sistem optimalisasi pengaturan irigasi air waduk diimplementasikan ke dalam sistem berbasis web. Data yang diolah yaitu debit input, data debit curah hujan, data debit penguapan, dan data debit output berupa data kebutuhan air. Data output yang dihasilkan berupa nilai distribusi release air per periode. Nilai optimal diperoleh dari nilai kebutuhan debit air per periode, nilai rasio release debit air per periode, nilai tampungan waduk, dan nilai optimalisasi debit release per periode, sesuai dengan nilai debit kebutuhan air dan prioritas pintu pengairan. Nilai optimal diperoleh ketika nilai distribusi release berbanding lurus dengan nilai debit output, dan kebutuhan debit output terpenuhi. Pada saat kebutuhan tinggi, nilai distribusi release dapat mendekati nilai debit output. Sedangkan pada saat kebutuhan rendah, nilai distribusi release harus seminimal mungkin, sehingga sesuai dengan nilai debit output.

Sermo Reservoir is a water source in Kulon Progo District and its surrounding, which is used for raw irrigation needs, household needs, industrial center needs, and other needs. The problem is, the capacity of reservoir is decreased, and water demands are increased. Therefore, research is needed for the optimal use of water from Sermo Reservoir, according to water needs and reservoir water availability, as well as priority of irrigation, in order to achieve the optimal value. Optimalization of reservoir irrigation management system implemented into a web based system. The processed data are water input flow data, rainfall input flow data, evaporation discharge flow data, and water needs data per period. The resulting data is water discharge release value per period. The optimal value is obtained from the value of water needs data per period, ratio of water needs per period, dam reservoir value, and optimalization of water discharge release per period, according to the water discharge output and prioritized sluice. The optimal value is obtained when the proportional value of distribution of water release and water discharge output value are met. At the high demand, the value of distribution of water release can approximate meet the value of water discharge output. While at the low demand, the value of distribution of water release should be kept to minimum, according to the water discharge output.

Kata Kunci : Optimalisasi, Debit Input, Debit Output, Debit Curah Hujan, Debit Penguapan, Release, Rasio, Prioritas