Potential flooding in the APT Pranoto Samarinda Airport area as a result of the airport runway extension

Abstract

Samarinda City has the Aji Pangeran Tumenggung (APT) International Airport Pranoto in the Karangmumus watershed prone to flooding. The planned extension of the runway for approximately 1 km will cross over the Karangmumus River. This study aims to determine the potential for flooding in the APT Pranoto Airport area and to determine the planned utilization of the Karangmumus Hulu Dam. The methodology used includes design rain analysis. Rain data is sourced from the BMKG Temindung Station, Samarinda City (1978-2021). The flood discharge design was analyzed using the Limantara method. Flood tracking was carried out on the Upper Karangmumus River channel and its tributaries, as well as on the planned Upper Karangmumus Dam, using HEC-RAS 6.1 software. Flood exposure map analysis is based on LiDAR maps. The results showed that 2 hours after the rain, floods had entered the airport area, both from the Karangmumus River and its tributaries. The development of the dam in the Upper Karangmumus can reduce flooding that enters the airport area. The research recommendations are in the form: that it is necessary to build flood control upstream of the Karangmumus watershed and to normalize and arrange the Karangmumus River channel in the APT Pranoto Airport area.