Nilai Koefisien Limpasan (C) Sub Das Desa Uwemanje Kecamatan Kinovaro Kabupaten Sigi
Abstract
Population growth has increased the demand for land and water, leading to changes in land use, particularly in forest areas. These changes can affect watershed hydrological functions and increase flood risk through greater surface runoff. Therefore, conservation efforts are needed to maintain watershed sustainability and water availability. The Uwemanje Sub-watershed plays an important role as a hydrological regulator and irrigation water source for several villages in Kinovaro District, Sigi Regency, Central Sulawesi Province, including Uwemanje, Porame, Binangga, Baliase, Boya Baliase, Padende, and Sibedi. This study aimed to assess the hydrological condition of the Uwemanje Sub-watershed by analyzing its runoff coefficient (C). The research was conducted from April to June 2022 in Uwemanje Village. The Rational Method was applied using streamflow discharge and rainfall data to determine the runoff coefficient. The results showed that the watershed area covered 12,470,000 m², with a daily discharge of 12,966.57 m³ and rainfall of 0.07893 m. The calculated runoff coefficient (C) was 0.0013. This value indicates that most rainfall is still able to infiltrate into the soil, resulting in relatively low surface runoff. Therefore, the hydrological condition of the Uwemanje Sub-watershed catchment area remains stable, and the forest's function as a regulator of water flow has not experienced significant physical disturbance.
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