Surface runoff of Bekasi River subwatershed

Watershed responses to the rainfall are affected by watershed characteristics, geology, soil and land use type. Land use type is dynamic as human activity. The changes in land use will effects surface runoff. More impervious area means more surface runoff generated to the downhill. The surface runoff transported nutrient and factory waste to the river that can affect the water quality. Thus, the objective of this research was to analyse surface runoff because of the land uses change in Bekasi River sub watershed. Surface runoff was analysed using SCS Curve Number and land use change data was generated using cross tabulation. The increase of settlement and agricultural land was noted in Bekasi River sub watershed for 2014-2019 periods. The land use change effected the increase of surface runoff approximately 3.69%.