Reservoir Capacity for Maximum Flood Discharge From The Flow of Rainfall Entering Through the Karang Mumus River in the Samarinda City, East Kalimantan

Authors : Yayuk Sri Sundari; Purwanto; Yuswal Subhy, Habir

Volume/Issue : Volume 8 - 2023, Issue 7 - July

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It is hoped that the Benanga Reservoir in Samarinda City can function as irrigation for the surrounding community's rice fields, as a flood buffer or controller, and also as a Local water company (PDAM) raw water, and in the future it can become a water tourism area for the people of Samarinda, as well as residents outside Samarinda. The main problem facing the current is the reservoir not being able to function as needed due to the insufficient capacity of the reservoir due to the large amount of sedimentation and the surface is filled with wild water hyacinth plants. The current condition of the existing reservoir has an area of 108 hectares and the volume of the reservoir that does not fulfill it is only 3.24 x 106 m3 . To find out the reservoir capacity of the Benanga Reservoir, it is necessary to carry out an analysis of inflow and outflow calculations and an analysis of the reservoir capacity. The study aimed to determine the water holding capacity of the Benanga Reservoir, Samarinda. The research was conducted at the Benanga Reservoir, Samarinda City from April to May 2023. Primary data were collected, namely the depth of the reservoir and the volume of the reservoir, secondary data, namely the area of the reservoir, from the Department of Public Works and Public Housing (PUPR) Office of East Kalimantan. Data analysis, namely: analysis of tracking floods through the reservoir using the Muskingum method, analysis of reservoir capacity (inflow and outflow), analysis of sediment deposition in the reservoir, analysis of sediment that settles in the reservoir, and maximum flood discharge. The results of the research show that: (1) The results of the analysis of flood tracing through the Benanga Reservoir obtained that the flood discharge entering the reservoir (Qinflow) was 706.4578 m3 /second and the flood discharge that was leaving the reservoir (Qoutflow) was 443.930 m3 /second, so that the Benanga Reservoir can reduce flood discharge by 262.528 m3 /second; and (2) by using the mass arch method, the capacity of the Benanga Reservoir is 27.145 x 106 m3 , while the actual water holding capacity of the Benanga Reservoir is 3.240 x106 m3 .

Keywords : Reservoir Capacity, Flood Discharge, Reservoir Volume, Benanga Reservoir


Paper Submission Last Date
31 - December - 2023

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