Rainfall-discharge modeling in Juana Watershed

Abstract. Juana Watershed has various problems, one of which is flooding during the rainy season and drought during the dry season. One of the causes of flooding is changes in land use, which results in an increase in the amount of Juana River runoff. Efforts that can be made to overcome this are by modeling rainfall discharge to approach hydrological values in the field. The purpose of this study was to examine the magnitude of the simulated discharge that occurred in the Juana Watershed. The data used were rainfall, land use maps, soil type maps, and topographic maps. The results of this modeling are a trend of changes in the curve number value (land capacity to absorb water), namely an increase in the CN value in 5 sub-watersheds, a decrease in the CN value in 2 sub-watersheds, and an equivalent CN value (stagnant) in 1 sub-watershed. The largest increase in CN value was in Juana Sub-watershed 2 of 0.93, while the largest decrease was in Gembong Sub-watershed of 0.35.