Floods that occurred in Indonesia can not be separated from the system of roads and bridges . Roads may be damaged if water is allowed to run off on the road surface . As a result, the transport system and the economy becomes obstructed .Drainage , is one of bridge componentsfunctioned as water discharge so that the road bridge deck free of water ponding. This study aimed to compare the amount of water flow on and around the bridge. As a case study, drainage design of Sinapeulintegral bridge was made, one of which is the determination of the dimensions of the pipe stream. Based on the analysis, it was found that produced water flow due to rain on the Sinapeul bridgeis very small (about 1%) compared with the water flow that occurs around the road bridge. Consequently, stream pipe with a minimum diameter (75 mm) on the bridge is sufficient enough to drain off designed flood.