Abstract:The traditional drainage system of bridge deck drainage directly into the river can no longer meet the increasingly high environmental protection requirements. For the bridge drainage across sensitive water bodies, in order to avoid the water environment pollution caused by the initial rainwater or the leakage of dangerous liquid by traffic accident directly discharged into the water body, combined with the engineering practice, the design of organized discharge of bridge deck drainage across water bodies is carried out. The setting of the water collection facilities on the bridge deck is discussed, the volume of the accident tank is calculated and the technology of the accident tank is designed. The study results can be referred for the design of bridge drainage across the sensitive water bodies in the future.