Cakung floodway is a drainage channel that plays an importance rule for the overall of drainage s... more Cakung floodway is a drainage channel that plays an importance rule for the overall of drainage system in Jakarta. Rainfall in 2013 and 2014 produced a big flood in Jakarta. Based on flood map Jakarta 2013 and 2014, there are inundated areas due to 2013’s and 2014’s rainfall. So, it is necessary to analyze the flood water level in channel floodway. Using HEC-RAS, this study aimed to evaluate the water level due to the maximum rainfall in 2013 and 2014. HEC-RAS is a tool for 1D hydraulic modeling and has reliability in routing of canal water level or river flooding. The results show that the maximum rainfall in 2013 provides a significant increasing of water level in Cakung floodway compared with the maximum rainfall in 2014. Soon, the need for canal normalization to reduce flood water level in Cakung floodway should be considered.
Bank protection structure is applied generally as a countermeasure of the bank erosion problem. T... more Bank protection structure is applied generally as a countermeasure of the bank erosion problem. The structures, such as groynes, revetments and so on, will success to protect the riverbank locally. However, usually the structures will change the cross-sectional geometry, which lead to change the flow pattern or others hydraulics parameters. Furthermore, the structure will produce another bank erosion problem in another place, especially in case that the flow is a dominant factor in riverbank erosion problem. The horizontal two dimensional bed deformation analysis of the Sesayap River is performed. The advantage of the dredging method is discussed. The dredging of bars is the appropriate choice for the countermeasures of bank erosion of the Sesayap River at Malinau, when we considered the financial efficiency and bed degradation along both banks.
Cakung floodway is a drainage channel that plays an importance rule for the overall of drainage s... more Cakung floodway is a drainage channel that plays an importance rule for the overall of drainage system in Jakarta. Rainfall in 2013 and 2014 produced a big flood in Jakarta. Based on flood map Jakarta 2013 and 2014, there are inundated areas due to 2013’s and 2014’s rainfall. So, it is necessary to analyze the flood water level in channel floodway. Using HEC-RAS, this study aimed to evaluate the water level due to the maximum rainfall in 2013 and 2014. HEC-RAS is a tool for 1D hydraulic modeling and has reliability in routing of canal water level or river flooding. The results show that the maximum rainfall in 2013 provides a significant increasing of water level in Cakung floodway compared with the maximum rainfall in 2014. Soon, the need for canal normalization to reduce flood water level in Cakung floodway should be considered.
Bank protection structure is applied generally as a countermeasure of the bank erosion problem. T... more Bank protection structure is applied generally as a countermeasure of the bank erosion problem. The structures, such as groynes, revetments and so on, will success to protect the riverbank locally. However, usually the structures will change the cross-sectional geometry, which lead to change the flow pattern or others hydraulics parameters. Furthermore, the structure will produce another bank erosion problem in another place, especially in case that the flow is a dominant factor in riverbank erosion problem. The horizontal two dimensional bed deformation analysis of the Sesayap River is performed. The advantage of the dredging method is discussed. The dredging of bars is the appropriate choice for the countermeasures of bank erosion of the Sesayap River at Malinau, when we considered the financial efficiency and bed degradation along both banks.
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