Estimation of bed load sediment rate at sabo dam 2 bangga river

Abstract

The flood that occurred on November 2018 was a sediment disaster in the upstream of the Bangga River which resulted in the entire village being buried by sediment. The current research will estimate the volume of bed sediment transport at Sabo Dam. Measurements of the width of the riverbed were carried out on the specified river section. Measurements were carried out along 300 m and divided by 50 m per segment. Data obtained from primary data and secondary data are processed to obtain parameters that will be used when calculating the distribution of sediment. So, it can be seen that the characteristics of sediment grains in the 18 samples have grain sizes that are not much different. Based on the average data, segment 1, 2 and 3 can be classified as having poor gradation gravel, sand from gravel fragments, little/no fine grains. From the results of sieve analysis testing, it can be seen that the characteristics of sediments are dominated by sand and gravel. The bed sediment has a size of d50 0.2 mm - 12 mm and d90 0.44 mm - 50 mm. which is spread along the Bangga River Sabo Dam.