Penerapan Sistem Kolam Retensi (Retarding Basin) pada Daerah Aliran Sungai Deli untuk Pengendalian Banjir Kota Medan
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Institusion
Universitas Sumatera Utara
Author
Sumanto
Subject
Flood
Datestamp
2018-12-28 04:19:45
Abstract :
Flood was a condition of the water that could not be accommodated in the exhaust duct or the obstruction of water flow in the exhaust duct. The high rainfall that accompanied by alteration of land-using system could increase the runoff water surface that flowed quickly and caused flooding. Deli Watershed was one of DAS that was important in Medan. Deli river stretched 73.2 km with the DAS scope of 472.96 km2 started from regencies of Karo to the city of Medan. The purpose of this study was to analyze the bin of volume pools retention due to the return of debit flood of DAS Deli with the debit capacity of the cross section of the river. The methodology used in this study was the method of Synthesis Unit hydrograph Nakayasu and Melchior method for determining the debit flood by using the data analysis of the probability distribution and intensity of rainfall plans, also the Muskingum method for the analysis capacity of the pools retention. Based on the calculations by using the method of debit flood HSS Nakayasu obtained at 276.86 m3/sec and methods Melchior at 307.91 m3/sec for a return period of 25 years, the capacity of the river of 168 m3/sec, and the volume capacity of pools retention with Muskingum method of 855.310,8 m3. By the planning catchment pools without the pump and the depth of the pool was planned depth of 3 m, the extent needed an area of 285,103.6 m2 or about 28.6 ha. While the floodgate that needed were four doors with the width of each door at 2.76 m and the height at 2m.
Flood was a condition of the water that could not be accommodated in the exhaust duct or the obstruction of water flow in the exhaust duct. The high rainfall that accompanied by alteration of land-using system could increase the runoff water surface that flowed quickly and caused flooding. Deli Watershed was one of DAS that was important in Medan. Deli river stretched 73.2 km with the DAS scope of 472.96 km2 started from regencies of Karo to the city of Medan. The purpose of this study was to analyze the bin of volume pools retention due to the return of debit flood of DAS Deli with the debit capacity of the cross section of the river. The methodology used in this study was the method of Synthesis Unit hydrograph Nakayasu and Melchior method for determining the debit flood by using the data analysis of the probability distribution and intensity of rainfall plans, also the Muskingum method for the analysis capacity of the pools retention. Based on the calculations by using the method of debit flood HSS Nakayasu obtained at 276.86 m3/sec and methods Melchior at 307.91 m3/sec for a return period of 25 years, the capacity of the river of 168 m3/sec, and the volume capacity of pools retention with Muskingum method of 855.310,8 m3. By the planning catchment pools without the pump and the depth of the pool was planned depth of 3 m, the extent needed an area of 285,103.6 m2 or about 28.6 ha. While the floodgate that needed were four doors with the width of each door at 2.76 m and the height at 2m.
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