A new switch Dynamic indexed GW file is introduced to facilitate the use of distributed dynamic drainage levels for simulating many grids within a watershed in combination with a parameter GWFileNameIndex to govern which file that should be used as driving variables to each simulation. The file name should include an underscore prior the number. The number after the underscore will be replace by the value of the parameter value give by GWFileNameIndex. So GWInput_234.Bin will be renamed to GWInput_6732 if the value of the parameter is 6732. The same system is used to consider a distributed meteorological file using the switch Dynamic indexed input file in combination with the parameter InputFileNameIndex.