Identify the flood risks for 25 Indonesian cities

Published: 15 March 2018

Deltares will be commissioned by the World Bank to map the long term flood risks for 25 cities in Indonesia, taking into account the expected urbanization and the consequences of climate change. The data and basic information will be made accessible through a database, so that other cities benefit from this research. For the five cities with the highest risk, Deltares will also provide advice on how these cities can structurally defend themselves against these natural disasters.

Deltares works together with the Asian Disaster Preparedness Center (ADPC) and PT Wiratman. The aim of the research is to increase information and awareness at national and urban level and to identify which measures are necessary and effective to reduce flood risks and prevent disasters. Policy makers can make better informed decisions based on the information from this research so that the city is safe and livable in the longer term.

With the support of the Indonesian Sustainable Urbanization Multi-Donor Trust Fund (IDSUN) and the Global Facility for Disaster Reduction and Recovery (GFDRR), the World Bank is supporting the government of Indonesia to improve the understanding of disasters and climate risks by developing sustainable solutions. This involves looking at physical measures like green infrastructure in the city, drainage and groundwater management but also at non-physical measures like improving warning systems and risk-controlled urban planning.

This research is of great social importance. On average, almost 1.3 million people face flooding each year. The government of Indonesia spends between 300-500 million euros each year on reconstruction after these disasters. Moreover, the country is very vulnerable to the effects of climate change, such as rising sea levels and changing weather patterns, which in turn can lead to increased uncertainty in the availability of water, food production, transportation disruptions and urban development. In addition, the country is rapidly urbanising. It is expected that in 2035 71% of the Indonesian population will live in cities. Investing in urban drainage, flood management and improved preparedness is therefore becoming increasingly important because more people are exposed to risks.