Abstract
Floods is a disaster which is one of the causes of failure of watershed managemen. High rainfall is also a factor in flooding. As a result the river cross section is not able to accommodate the flow of water and cause the river to overflow. This research was conducted to determine the amount of peak discharge Sub-DAS Air Manna Bagian Hilir and identify areas prone to flooding. This study uses a synthetic unit hydrograph (HSS) Snyder and HEC-RAS 5.0.7. Hydrological analysis results obtained from the peak discharge at Sub-DAS Rindu Hati using HSS Snyder for a return period of 2, 5, 10, 25, 50 and 100 yearsthat is 743,627 m3/sec, 839,491 m3/sec, 897,761 m3/sec, 962,599 m3/sec, 1008,717 m3/sec, and 1052,800 m3/sec with a peak time of 5,915 hours. After analysis using software HEC-RAS 5.0.7, DAS Air Manna no longer able to accommodate flow rates occur.
Highlights
Banjir adalah bencana yang salah satu penyebabnya terjadi akibat kegagalan pengelolaan Daerah Aliran Sungai (DAS)
able to accommodate the flow of water
This research was conducted to determine the amount of peak discharge Sub-DAS Downstream Manna Water
Summary
2.4.1 Perhitungan Debit Menurut Anonim II (2009), debit air (water discharge) adalah volume air yang mengalir melalui suatu penampang melintang sungai per satuan waktu, dalam satuan m3/detik.
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