Analisis Tinggi Muka Air Daerah Genangan Banjir Rob Sungai Banjirkanal Barat Bagian Hilir Menggunakan Software HEC-RAS
Daftar Isi:
- Floods are natural disasters that can actually be minimized or can be avoided if you know the source of the problem. The increase in flood discharge is largely influenced by changes in land use in the watershed (DAS), and river profile forms that cannot accommodate the flood discharge that occurs in each period. The purpose of this study was to determine the area of inundation that occurs due to runoff from the western banjir river in the flooded area, and provide alternative solutions to overcome and minimize the occurrence of flooding. Data needed in the form of daily rainfall data from 2005 - 2017 at five rain stations, namely Madukoro Station, Simongan Station, Kalisari Station, Gunungpati Station, and Sumur Jurang Station. The results of this study are the 2-year return period inundation area of 1,461,331 m2 and flood water level between 1.17 m to 4.52 m. The area of the 5-year return period inundation is 1,841,309 m2 and the flood water level is between 1.67 m and 4.8 m. The total inundation area of the 10-year return period is 2,455,585 m2 and the flood water level is between 2.01 m and 5.01 m. The total inundation area of the annual return period is 2,681,935 m2 and the flood water level is between 2.32 m to 5.2 m. The total inundation area of the 50-year return period is 3,579,047 m2 and the flood water level is between 2.47 m to 5.28 m. The 100-year return period inundation area is 5,131,457 m2 and the flood water level is between 2.56 m and 5.34 m. From the modeling it can be seen where the runoff occurred. So from that, alternative solutions were made in the form of river normalization.. Keywords: Watershed (DAS), HEC-HMS, HEC-RAS, Inundation Area, Runoff