Flood Early Warning System (EWS) is one of the key programmes implemented by Practical Action in Nepal since 2002. We have realised, there is a need of EWS in South Asia regional scale as the disasters are not limited within the political boundary. To make this happen, there is a need for strategic coordination and collaboration between and among the nations, and advancement of technologies to meet the needs. This publication captures long standing experiences of Practical Action and hope that it will be useful for other practitioners who are interested and engaged in EWS for Disaster Risk Reduction.