/usr/share/gromacs/top/charmm27.ff/watermodels.dat is in gromacs-data 2018.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | tip3p TIP3P TIP 3-point, recommended
tip4p TIP4P TIP 4-point
tips3p TIPS3P CHARMM TIP 3-point with LJ on H's
tip5p TIP5P TIP 5-point (see http://redmine.gromacs.org/issues/1348 for issues)
spc SPC simple point charge
spce SPC/E extended simple point charge
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