In the event of accidents at chemical industrial parks, to prevent leaked materials or flushing water from flowing over the surface, the direct discharge through the municipal rainwater system causes water pollution. The current rainwater network is equipped with an integrated gate-valve plate gates. Combined with electrical automation, the interception and control of accident water can be reliably, efficiently and economically achieved. Before the long-term improvement of the three-level emergency management system for pollution incidents, the buffering effect of the existing rainwater network can be brought into play through simple modification, which is a temporary emergency measure to deal with water leakage accidents under different production start-up schedules of different enterprises. Aiming at the various construction conditions and limitations at present, the engineering application and design experience are summarized for reference by peers.