ABSTRACT

The inability of the channel capacity to accommodate surface runoff can cause flooding. The Pangkung Lebak Muding channel, which is part of the Tukad Mati watershed, still experienced flooding from 2009 to 2019. Evaluation of flood points in the Pangkung Lebak Muding channel was carried out by comparing the capacity of the existing channel with the design discharge, then determining the capacity of the new channel. Initial channel mapping using Google Earth and GIS applications. The evaluation results are remapped to compare and display differences in flood points. The identification results show that there are 9 flood points for a 2-year return period and 10 points for a 5 to 10-year return period in secondary and tertiary canals. While in the primary channel there are 2 flood points for all return times. The solution to evaluating the capacity of this channel is dredging to a depth of 0.46 m for the secondary and tertiary channels and 1 m for the primary channel. The evaluation results show that all secondary and tertiary channels are not flooded in all return periods.