ABSTRACT

Bangil Subdistrict in Pasuruan Regency, East Java contains the Kedunglarangan River with a length of 39.69 km and the Kedunglarangan Watershed (DAS) covering an area of 324.01 km2. The inability of the drainage channel which is unable to accommodate the upstream water flow causes flooding in the Kedunglarangan River. This happened due to heavy rains that inundated several areas, one of which was in Kalianyar Village. This study aims to determine the planning of flood control management in the area. The method used for flood management in this study will be carried out by analyzing the design flood discharge with a return period of 25 years and the channel capacity analysis using HEC_RAS. The analysis was used for planning the addition of the embankment height in each river segment to reduce flood discharge. The results in this study were obtained by adding the height of the embankment in segment 1 with a discharge (Q) of 254.404 m3 /s, carried out by adding an addition to the height of the left embankment by 4 m and the right side of the embankment with a height of 3.5 m, Segment 2 with river water discharge 550,839 m3 /s, the addition of the height of the embankment on the left and right sides is 6.5 m and 4 m, respectively and segment 3 with a river water discharge of 680,997 m3 /s, is done by adding the height of the embankment on the left and right by 5m and 2.5m.