ANALISIS GENANGAN BANJIR AKIBAT LUAPAN BENGAWAN SOLO UNTUK MENDUKUNG PETA RISIKO BENCANA BANJIR DI KABUPATEN BOJONEGORO

Abstract

The number of flood occurrences in Bojonegoro were 105 of the period 1815 to 2016 (BNPB, 2016). Flood in Bojonegoro is generally caused by the overflowing of Bengawan Solo River. This study was conducted to analyze the inundation in Bojonegoro due to the overflow of Bengawan Solo. Flood inundation model simulation performed by 1D / 2D model using HEC RAS ver. 5.03 software. Then for the analysis of affected areas using ARC GIS 10 software. The results of the study found that the vast inundation of simulation results for each return period in Bojonegoro is 250.33 km2, for return period of 100 years discharge. Extensive inundation simulation in Bojonegoro for each return period of 50, 20, 10, 5, 2 years discharges are 246,37 km2 240,68 km2, 22,69 km2, 16,23 km2, and 12,48 km2. The flood hazard level in Kanor, Malo and Trucuk District have a high hazard with a value more than 0,7 on 2 years to 10 years discharges return period. The area which has the most extensive high hazard level is in Bojonegoro District.