As one of the lowest-lying terrain in the Hulu Langat sub-district, the areas surrounding Kg. Sungai Serai is often hit with both river and flash floods.  As such, there was a necessity for the residents in this area to become familiar with early warning and public warning systems and know what to do once they receive the alerts.  This need culminated in the implementation of a Community Evacuation Drill, which was an exercise spearheaded by the community members with assistance from the government agencies.

The Drill was a two-day event to have communities (1) become familiarized with community evacuation drill procedures and (2) find out whether the flood sirens can be heard within the community area. Unlike Kapar, the communities in Hulu Langat have conducted evacuation drills but they have been government response drills. Thus, the community evacuation drill is the first such exercise for Hulu Langat.