Land inventory and designation of the Kranji river riparian zone in Purwokerto city, Central Java

River banks are virtual lines of the riverbed designated as river protection boundaries. This research aimed to inventory the Kranji Riverbank's land condition and conduct a study to determine the width of the riparian zone. The methods used were field surveys, identification of land along the 11 km river, and analysis of flood discharge designs with a return period of 10 years. The results of an inventory along the river on the river land dominated the permanent building. There are 400 building units included in the repair zone on the Kranji River. Based on the planned flood analysis results with a return period of Q10 years of 38.11 m3/s, there are 160 flood points along the river. The width of the riparian zone in urban areas is 10 meters in East Purwokerto, while outside urban areas, it is 50 meters in Baturaden District. The benefit of the results of this research is the provision of initial data for coordinating with several other agencies in efforts to implement the Kranji River border in the future.