Stream network using multiple cell thresh holds inArcGIS

There is a tool called Flow Length in ArcGIS which measures flow length from either a downstream point or upstream points (upstream is based on the longest flow path). You could do a series of Con statements on a reclassified flow length raster. For example, maybe if flow length exceeds 2.4 km then the threshold for flow accumulation must be X or greater. If flow length is less than 2.4 km then flow accumulation must be Y or greater to be considered a stream. It would also be possible to implement this in a continuous fashion instead of as a series of if-then statements.