HOLDING CAPACITY ANALYSIS OF AN EXISTING DRAINAGE CHANNEL USING THE SOFTWARE HEC-RAS 4.1.0
DOI:
https://doi.org/10.11113/jurnalteknologi.v88.21117Keywords:
Floods, drainage, HEC-RAS, budget, water surfaceAbstract
One of the factors of flood is resident’s fast-paced growth rates. More than half of the world population currently live in urban areas. This growth has significant impacts on the hydrological cycle so that it will affect the drainage system a great deal. This research was aimed at analyzing the flood-related issues resulting from an insufficiently optimum holding capacity located on Pulau Sebesi Street, Sukarame Sub-District, Bandar Lampung City, Lampung Province, Indonesia. The methods on this research involved HEC-RAS 4.1.0 for the channel hydrologic analysis and the ministerial regulation PUPR No 1 of 2022 for the budget comparison. Based on the calculation, the water surface height of the right the part of the right existing drainage channel at the riverhead was 2,42 m and that at the river bottom was 2,21 m, whereas the height of the part of the left existing drainage channel at the riverhead was 0,71 m and that at the river bottom was 1 m, so the channels could not hold the flood debit. From the results of the budget comparison of the channel normalization, it is known that the cost variable was equivalent to Y, while the channel dimensional enlargement was equivalent to 333Y. The conclusion is that the drainage cannot hold the planned flood debit in a recurrence interval of 10 years. For this reason, such a solution as dimensional enlargement is of the essence so that no flood will reoccur. Drainage channel normalization is an alternative.
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