By installing a water level gauge to check the depth of flooding in the habitually flooded area, and using a sluice gate and a pump operated in connection with this to flow into the stormwater regulating area, it is possible to prevent flooding by always maintaining a constant water flow rate in the section where the passage area is insufficient. It is an excellent control site for flood prevention. A water level meter installed in the installation section of the water level meter in the flooded area, which is a section where the flow area of the storm water pipe is insufficient, and the entrance to the storm water control area to flow into the storm water control area when more than the planned flood amount determined by the water level meter flows into the storm water pipe An inflow sluice installed at the stage to open and shield, a stormwater discharge sluice that opens and shields to discharge rainwater into the stormwater discharge pipe of the stormwater treatment area, and a stormwater gate installed to discharge rainwater in the stormwater control area to the outside A pump and a sewage pump installed to discharge sewage are provided. Therefore, when the preset immersion depth is reached, the inflow sluice gate is opened automatically or manually to store rainwater in the stormwater control area, thereby reducing the amount of water flow in the section where the passage area is insufficient to prevent flooding.
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