Sistem Penanganan Dan Pengendalian Banjir Sungai Asahan

Abstract

Often the weather is a flood in kabupaten asahan and kota tanjung balai due to the overflow of the river plain, very attractive for use solutions countermeasures research on the problem of flooding rivers Asahan in Kabupaten Asahan, starting with the primary and secondary data relating to location and inventory of rainfall data and the data of existing conditions of the river Furthermore, the frequency analysis of rainfall and flood discharge calculation method plan Mean Annual Flood, melchior and haspers. From the analysis of flood discharge, to plan formidable floods are used debit flood return period of 25 years with the method of Mean Annual Flood Q25 = 335.792 m3 / sec, the method of combination of methods Melchior-Log Pearson III Q25 = 450.197 m3 / sec and methods concept Melchior-Haspers Q25 = 519.971 m3 / sec, the search method Haspers-Log Pearson III Q25 = 1,280,405 m3 sec and a combination Haspers Haspers Q25 = 1,478,847m3/sec. The result using a standard step method shows the additional flood level elevation was no longer able to be accommodated by the river Asahan. Based on the analysis of the above problems, additional embankments are required to accommodate the maximum flood discharge of the Asahan river.