Abstract:An old bridge spans the source of drinking water. Its drainage system is missing. The bridge deck drainage directly into the river body may have a certain impact on the water environment. In view of this situation, an emergency drainage and collection system for old bridge deck is designed. The system can realize the diversions and drainages of the initial rainwater, deck rainstorm and deck dangerous chemical leakage by setting the longitudinal drainage pipe, dangerous chemical identification sensor, control switch and emergency pool. At the same time, the overflow pipe, grit chamber and rubber expansion hose are set to improve the service function and service life of the system. The design of the system is novel and practical. The relevant results can provide reference for the emergency drainage design of similar bridges.