Vertical Distance to Channel Network ta_channels ParameterRaster|ELEVATION|Elevation|False ParameterRaster|CHANNELS|Channel Network|False ParameterNumber|THRESHOLD|Tension Threshold [Percentage of Cell Size]|None|None|1 ParameterBoolean|NOUNDERGROUND |Keep Base Level below Surface|True OutputRaster|DISTANCE|Vertical Distance to Channel Network OutputRaster|BASELEVEL|Channel Network Base Level