Flood debit analysis based on land use: A case of Batang Arau Watershed, Padang

LUSI, UTAMA (2021) Flood debit analysis based on land use: A case of Batang Arau Watershed, Padang. Flood debit analysis based on land use: A case of Batang Arau Watershed, Padang.

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Abstract

. A flood may occur for both climatology and human action factors. The climatology factors can be in the form of land degradation, land-use changes, and population increase. The land-use changes can identify when there is a conversion of recharge area into a built area. The conversion may happen because there is potency for a flood area to transform into a place of cities development and settlements. When the population increases, space needed also enlarges. Consequently, the surface flow increase and can cause a flood. Padang - Indonesia, has high rainfall intensity around 3,329 to 4,296 mm/year, which results in a frequent flood. The worst flood occurred on 26 September 2018 and 2 November 2018, which washed away a bridge and caused a 3-meter high puddle. In analyzing those phenomena, this study applied a descriptive qualitative method. The image used in the map was analyzed with Argis X quantum program to get a flood-prone map. The rainfall was calculated by using methods of Thiesen, Gumbel, and Log Pearson III, while the debt calculated using the rational method. 3 The difference debit between these was 42,030m /second. The results, the amount of land used to discharge was higher than due to the rainfall.

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