Dalam penelitian ini dilakukan beberapa tahapan berupa pengumpulan data primer dan skunder. data primer yang dimaksud berupa dokumentasi di area penelitian. sedangkan untuk data skunder meliputi data dari instasi terkait antara lain data penguapan, kelembapan udara, kecepatan angin, suhu udara, penyinaran matahari, peta topografi, serta melakukan studi pustaka yang berasal dari buku irigasi dan jurnal. tujuan dari penelitian adalah menganalisa kebutuhan air irigasi daerah semunti juata laut tarakan berdasarkan data klimatologi. kebutuhan air irigasi untuk tanaman padi sangat tergantung dari berbagai faktor penyiapan lahan, pertumbuhan tanaman, penentuan kehilangan air karena perkolasi, penentuan penggantian lapisan air dan hujan efektif. hasil penelitian membuktikan bahwa kebutuhan air irigasi dengan luas wilayah daerah irigai sungai semunti sebesar 4,9 ha dengan kebutuhan air irigasi pola tanam padi-padi dan palawija dimulai awal pengolah lahan pada awal bulan september maka perhitungan manual (kp-01) kebutuhan air irigasi maksimum 7,71 ltr/dtik. pada hasil analisa potensi das yang tersedia sebesar 8,98 km² dan potensi luas daerah irigasi sebesar 4,9 ha. berdasarkan hasil peritungan neraca imbangan, sangat mencukupi sehingga pemberian airnya secara terus menerus/kontinyu

In this research, several stages of gathering primary and secondary data was carried out. the primary data is documentation in the area of research. meanwhile, secondary data includes data from relevant agencies such as data on evaporation, humidity, wind speed, air temperature, solar radiation, topographic maps, and conducted a literature review from irrigation books and journals. the purpose of this research is to analyze irrigation water requirements in semunti area juata laut tarakan based on climatological data. irrigation water requirements for rice crops depends on various factors such as land preparation, plant growth, determination of water loss by percolation, determination of the replacement of water layer and effective rainfall. the research proves that the irrigation water requirements in semunti river irrigation area with an area of 4.9 ha with irrigation water requirements for cropping patterns of rice-second crop begins by farmer in early september, the manual calculation (kp-01) of irrigation water requirements is a maximum of 7.71 l / sec.on the results of the analysis of das potential which provided of 8.98 km² and potential irrigation area were 4.9 ha. based on the results of the balance sheet, there is sufficient so that the provision of water is continuously