HUBUNGAN CURAH HUJAN TERHADAP LIMPASAN PERMUKAAN DAN SEDIMEN PADA BERBAGAI PENGGUNAAN LAHAN DI DAS ARUI, KABUPATEN MANOKWARI

Abstract

Surface runoff and sediment are often underestimate in efforts silting up mitigation. Whereas both if in large quantities will cause a decrease in capacity and overflow of river water. This study aims to determine the effect of rainfall on surface runoff and sediment yield, to study the physical and chemical properties of the soil in five land uses and to determine the percentage of land use change for 4 years. SPSS 17 simple regression analysis was used to determine the effect of rainfall on surface runoff and sediment yield. The results showed that there was a relationship between rainfall and surface runoff, only land use was significant as moor, while other uses were not significant, followed by linearity test showing a linear line. The results of the correlation/closeness significance test showed no correlation (very weak) only on the use of land as a moor where there was a fairly close correlation. Thus, increasing rainfall does not necessarily increase sediment. The physical and chemical properties of the soil are classified as moderate which is quite influential in water absorption and sediment yield. Land use tends to change as a result of illegal logging and expansion of oil palm plantations.