Makanuai river flood control study at Jayapura district

Asep, Huddiankuwera and Reny, Rochmawati and Irianto, Irianto (2021) Makanuai river flood control study at Jayapura district. In: The 5th International Symposium on Infrastructure Development, 28 - 29 August 2020, Makasar, Indonesia.

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Abstract

The location of this research was carried out in the Makanuai River, Sentani Timur district, Jayapura Regency. Analysis of the planned flood discharge on the Makanuai river using the Rational method for calculating the planned flood discharge. Based on the results of the analysis of the calculation of flood plans with the method that has been done, it can be seen the flood discharge of the Sungai Makanuai plan, the return period Q 2 years = 123,358 m3 / sec, Q 5 years = 155,098 m3 / sec, Q 10 Years = 177,421 m3 / sec, Q 25 Years = 207,294 m3 / sec and Q 50 Years = 230,698 m3 / sec. Based on the analysis of the flow hydraulics on the cross-section of the Makanuai River in the HEC-RAS Program, it was found that the elevation of the floodwater level exceeded the capacity of the river. Therefore, it is necessary to make a Dividing Channel (Corner) accommodate the remaining flow of airflow that cannot be accommodated in the Main Canal so that the capacity of the Makanuai river flow will be reduced when maximum rainfall occurs. The operated Shaving Channel is capable of flowing discharge of 204,259 m3 / sec for a 50 year return period.

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