Flash flood that hit the West Flood Canal (Kanal Banjir Barat), which is the downstream of Garang River (Kali Garang) in 1990, still left some terrible memory for the locals. During the event, many of them witnessed how their neighbors and even families fell victims, lost their lives and possessions. According to the incident record, the flash flood in that year inundated more than 100 houses and claimed 47 lives. Material loss was estimated to be at 8.5 billion rupiahs. The flood can be considered as one of the worst that ever occurred in Semarang City.
Flood resilience within the Garang Watershed in Central Java has at the least involved two main regions which are Semarang Regency and Semarang City. Semarang Regency, which is located in the upstream area, is ecologically important in terms of flood management that could affect the mid- and downstream area. Therefore, it is important to maintain the quality of the ecosystem and its services that contribute to flood prevention such as the storm water management.
Innovation of information and communication technology (ICT) has played a big role in development globally, including in Indonesia. Nowadays, people can easily use their mobile phones to access numerous applications that are available on the internet. Over the past years, the utilization of ICT development has explored the capacity to use community-based generated data for planning and decision-making processes in various sectors such as mobility, disaster, public facilities, socio-economic matters, etc.
According to BNPB (Indonesian National Board for Disaster Management), more than 93% of disasters in Indonesia are hydrometeorological disasters. Out of 2,341 disaster events, 787 were caused by flooding. Some of the affected areas share the same watershed, which has proved to share trans-boundary waters that are facing increasing demands for basin development collaboration.
Floods in 2017 that affected nearly 40 million people across India, Nepal and Bangladesh were strong reminder that disasters and their impacts are often not contained by any national or other jurisdictional boundaries. This results place strong emphasis on transboundary governance systems. The question is what can we do to manage transboundary action better?