Version 5.4.0 of the Community WRF-Hydro® Modeling System source code is consistent with the NOAA National Water Model (NWM) v3.1 code in operations and includes the following changes, additions, and fixes: WRF-Hydro® v5.4.0 Release Notes Please note that starting with WRF-Hydro v5.4, CMake is the preferred build system. The legacy configure/compile scripts are still present, but should be considered deprecated and will not be supported in future releases. WRF-Hydro model documentation has been migrated from individual Word and PDF files to an online documentation system that will be hosted alongside the model code in the GitHub repository. Please see the docs/ directory for more details and view the documentation on the web at: https://wrf-hydro.readthedocs.io/en/latest For specific updates, reference the PRs listed in the following sections: Model Improvements PR#756: Add initial support for gage-assisted diversions in channel routing, which requires a new optional Diversion netCDF parameter file. This also adds a C compiler dependency PR#725: lake_option added to &hydro_namelist to override lake physics options (or turn off lakes completely). Reservoir options have been moved to a new, separate &reservoir_nlist namelist PR#743: liquid water fraction (or snow) added as optional forcing input variables Forcing variables names can now be supplied as namelist inputs PR#782: documentation converted to readthedocs, also PR#786, PR#785, PR#774, PR#789, PR#795, PR#796, PR#792, PR#799, PR#798, PR#791, PR#799, PR#798, PR#797, PR#805, PR#804, PR#809, PR#810 Bugfixes: PR#803, PR#808: lake_option bugfixes PR#813: Finding NetCDF fix for new Derecho environment PR#811: Adding routing diversion Makefiles PR#785: Support Fedora MPI environmental variables for NetCDF PR#752: LSM accumulations not reset if RSTRT_SWC equals no reset PR#729: Crocus glacier arrays changed to optional from allocatable Bugfixes: CMake nudging parallel build General cleanup and misc. PR#802: increment version numbers PR#794: input namelists and parametere tables PR#790: PR template updates PR#764: adding deprecation warning to configure build, CMake preferred PR#739: general CMake improvements, tabs to spaces PR#720: header info from files removed PR#724: redundant return statements removed PR#723: MPI case style fixed PR#733: .F -> .F90 file renaming PR#717: Added citation file

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