In order to move towards a Smart City, Jakarta needs to optimize the database to respond to future challenges in the face of climate change and reduce the impact of floods. As one of the rivers that contributes to flood disasters in Jakarta DKI region, the Ciliwung River Early Warning System is presented as a solution to mitigate<br />
the impact of floods by using Machine Learning Artificial Neural Network (ANN) technology with Hydro Dynamic Model (HEC-RAS) as its database. There are 12 urban villages that become an area of interest from the upper part Balekambang to the down part Manggarai with the predicted water level on the Ciliwung River