Forest has an important role in hydrological process due to its capacity in regulating water. Forest can absorb and storage water in the rainy season and release it in the dry season. Many studies have been conducted to get the insight of hydrological process in a catchment with several land uses. This study aimed to elaborate the relationship between rainfall and discharge (run off and sediment discharge) in Ngatabaru sub sub watershed with forest as the major land use. The result of this research shows that forest could absorb much rainfall in the rainy season and released it slowly in the dry season. The river regime coefficient (the ratio of maximum and minimum discharge) in the case study was 2.5, indicating that water flows continuously all year long. But, the run off coefficient (ratio of discharge and rainfall) was 0.15, indicating that much of the rainfall was lost because of the high evapotranspiration rate of the forest. In the case of extreme rainfall, trend of sediment discharge was more influenced by rainfall rate than river discharge. ABSTRAKHutan mempunyai peran yang penting dalam proses hidrologi karena kemampuannya sebagai pengatur tata air. Hutan dapat menyerap dan menyimpan air pada musim penghujan dan melepaskannya pada musim kemarau. Banyak penelitian telah dilakukan untuk mengetahui proses hidrologi dalam DAS dengan berbagai tipe penggunaan lahan. Penelitian ini bertujuan untuk mengkaji hubungan curah hujan dan debit (limpasan dan debit sedimen) di sub sub DAS Ngatabaru, Sulawesi Tengah dengan vegetasi hutan sebagai penutup lahan utama. Hasil penelitian menunjukkan bahwa hutan dapat menyerap banyak air hujan pada musim hujan dan melepaskannya secara perlahan pada musim kemarau. Koefisien rejim sungai (rasio debit maksimum dan minimum) dalam penelitian ini adalah 2,5, menunjukkan bahwa air mengalir sepanjang tahun. Namun demikian, koefisien aliran (rasio debit dan hujan) sebesar 0,15, menunjukkan bahwa sebagian besar hujan hilang karena tingginya evapotranspirasi hutan. Pada kejadian hujan yang sangat tinggi, kecenderungan debit sedimen lebih dipengaruhi oleh curah hujan daripada debit sungai.Kata kunci: Hubungan, hujan, debit, debit sedimen, sub sub DAS Ngatabaru
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