Morphometric Characteristics of Cipeles Watershed to Identify Flood Prone Area

Abstract

Cipeles watershed is located on Sumedang Regency, West Java Province. This research aims to identify the flood-prone area in the Cipeles Watershed based on morphometric characteristics. This research was conducted through studio analysis using Map Info and Global Mapper software and mathematical calculations. The data used in this research are stream network and topography. Digital Elevation Model was used to analyze the slope of the research area. Morphometric aspects used in the mathematical calculations consist of Drainage density, Drainage texture, Ratio of circularity, Ratio of elongation, and Form factor. The research area is a hilly area with high relief and a very steep-slightly steep slope in the west and south, relatively gentle in the middle to the east of the research area. It consists of parallel, subparallel, subradial, rectangular, dendritic, and subdendritic drainage patterns. Cipeles watershed has 38 subwatersheds with predominantly very elongated-circular shape and very coarse-coarse texture. The research area has relatively high rainfall that potentially causes flooding, especially downstream of the Cpl_10, Cpl_11, Cpl_12, Cpl_13, Cpl_14, Cpl_15, Cpl_16, and Cpl_17 subwatersheds. The research area is classified into low and moderate risk levels of flood potential. The low-risk level is located in Tanjungsari and Rancakalong district. The moderate risk level is located in North Sumedang, South Sumedang, Situraja, and Cimalaka district. The results showed that quantitative research could be used to identify flood prone area. It is recommended that the Cipeles Watershed can be well maintained through integrated watershed management and land use management.