The present invention relates to a surface water distribution equipment used in the process of organic matter and nitrogen removal using a floodplain river water , despite the presence of suspended solids can be stably supply the river water in the ground, even if flood plain is inclined aims to provide a stream water distribution equipment to supply the water uniformly. ; at a predetermined interval in water line delivery pipe connected to the river water and distribute the river water being supplied in a longitudinal direction, a delivery pipe while the delivery pipe and located below the support, for dispensing a minute secondary sphere and river water distribution in the longitudinal direction by the pipe for dispersing the predetermined area while the distribution is located under the support tool for filter media inside the filter chamber is filled to include filtering the suspended solids in the river water that falls aids for distribution, organic matter and nitrogen removal method of using floodplain river water, which is installed in the ground river water distribution equipment used.
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