Abstract
A river is a naturally occurring flow system that flows from upstream to downstream. Rivers have many benefits. Similarly, rivers have a negative impact if rainfall is high. It can lead to catastrophic flooding. Flooding often occurs along the central roads of Padang City when it rains, especially in the Maransi and Aie Pacah areas. The purpose of this study is to estimate the height of water level by using software HEC – RAS and estimate areas that have the potential for flooding in conditions before and after river normalization by using the software Arc-GIS. Data collection is carried out to achieve this goal, namely the maximum daily rainfall data, Digital Elevation Model (DEM) data obtained from the processing of aerial photo data, and cross-sectional data of the river. Then, a numerical simulation is performed to estimate the height of the water level, and then a numerical simulation is performed to determine the extent of the flood area. The results of this study are in the form of flood areas in conditions before and after river normalization with a period of 25, 50, and 100 years that can be used to see the effectiveness of river normalization work in the river.
Highlights
Batang Maransi River is a river located in West Sumatera Province [1], Padang City, Koto Tangah District
One of the largest floods ever occurred in the area around Batang Maransi, Koto Tangah district on March 22, 2016, where nine subdistricts in Padang City were flooded with a rain intensity of 384 mm
The results obtained by rational method are Q10 =58,637 m3/s, Q25 = 73,559 m3/s, Q50 = 85,562 m3/s, Q100 = 98,277 m3/s and assumed discharge that goes to the side drain of 20% of the river discharge, so that the discharge flood plan after taking into account the discharge that goes into the side drain is Q10 = 46,909 m3/s, Q25 = 58,847 m3/s, Q50 = 68,849 m3/s, Q100 = 78,622 m3/s
Summary
Batang Maransi River is a river located in West Sumatera Province [1], Padang City, Koto Tangah District. The large and small rivers in the Padang city area are not much different from the sea level height. Batang Maransi River is one of the rivers that are prone to flooding in the rainy season. Batang Maransi River crosssection is not able to accommodate the high rainfall of Padang City, so during the rainy season in the area around Maransi and Aie Pacah, there are often floods. One of the largest floods ever occurred in the area around Batang Maransi, Koto Tangah district on March 22, 2016, where nine subdistricts in Padang City were flooded with a rain intensity of 384 mm. In West Padang District, precisely at Maransi, floods entering residents' housing with a puddle height of 50-100 cm make residents required to leave their homes
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