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The spatio-temporal variation underlies and complicates studies related to earth surface processes.Subsequent to our previous studies reporting the temporal invariability of sediment concentration,this study further reports the spatial invariability of sediment concentration or the flow-sediment relationship in the hilly part of the Chinese Loess Plateau.The dense channel network dissects this area into numerous sub-watersheds,which are composed of entire slopes (a combination of the hill slope and the valley side slope).Our data mainly involves ten experimental sites of entire slope and sub-watershed and 580 flood events at three locations.