This appendix contains the key input files for the Christina River Basin EFDC water quality model calibration run. There are three primary input data files: EFDC.INP for the hydrodynamics, WQ3DWC.INP for the water column water quality, and WQ3DSD.INP for the benthic sediment flux submodel. The schematic diagrams on the next two pages indicate the relationship of the various input files to these three primary files. Due to space considerations, only the following key input files are listed in this appendix