[PROBLEMS] To provide a temporary river beach weir system for disaster prevention (measures against floods, floods, fires, storm surges, tsunamis, embankment destruction) by unmanned operation. [MEANS FOR SOLVING PROBLEMS] The shape of a water bag is created by the shape of a lead pipe of a picket scaffolding and a fastening metal fitting, and the size and shape of the water bag is adjusted by water supply and drainage and added to a sandbag. The weir. The water bag includes a water supply / drainage pipe, a suction inlet with a valve, a discharge outlet with a valve, and a water supply / drainage control system with an electric pump. A spray nozzle is provided for producing drizzle-like or cloud-like fine particles from a water bag for fire prevention. [Selection] Figure 1
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