Abstract
Flood is one of the most vulnerable disasters in Indonesia. Batang Arau river basin is located in the West Sumatra province, which is one of the areas that often experience the flood. Since 1894, a number of measures have been taken to control flooding in the Batang Arau river basin. However, until now, the incidence of flooding is still not appropriately resolved. The aim of this study is to identify the areas that had the worst impact due to flood events in the Batang Arau river basin over the past 10 years and then identify the leading causes of the flood event. After that, the Decision Support System (DSS) was carried out using the Analytical Hierarchy Process (AHP) method to determine the suitable measures both structural and no structural for flood control in the Batang Arau. In order to achieve these objectives, data was taken in the form of; the historical flood event over past 10 years, the factors causing flood events based on field observations and review studies, and Measures to control flood events according to experts. So that the results of this study will be able to describe short-term and long-term for flood management, which are adaptable for future flood management strategy.
Highlights
Batang Arau river, West Sumatra is one of the most flood-prone areas
The upstream river basin of the Batang Arau river basin is similar to the bird feather pattern, which means that water flowing from the tributaries enters the main river, but the flood discharge is small because the time of arrival of the streams varies
This study aims to identify the worst affected areas of the flood along the Batang Arau river basin, to identify the causes of flooding that have threatened the Batang Arau river basin lately, to inventory current flood control and evaluate compliance with existing conditions, and to develop a flood measures strategy with the Analytical Hierarchy Process (AHP) decision making system
Summary
Batang Arau river, West Sumatra is one of the most flood-prone areas. The factors which can cause flooding in this basin, are due to heavy rains, and triggered by increasing the population growth, the climate, and the land-use change and others. The Batang Arau river basin is located at 0o48 "- 0o56" LS and 100o21 "- 100o33" BT with elevations from 0 - 1,210 m above sea level. Batang Arau topography is dominated by steep to very steep slopes This is because the degree of slope of the river basin slopes is getting more upstream, so the surface water flow velocity will be higher towards the river basins. The upstream river basin of the Batang Arau river basin is similar to the bird feather pattern, which means that water flowing from the tributaries enters the main river, but the flood discharge is small because the time of arrival of the streams varies
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