[gmx-users] water model

[mahdiyeh poorsargol]

Dear all
I am a beginner in gromacs. I want to use water in my system. I choose the
SPC/E water model in the topol.top file by:

; Include water topology
#include "spce.itp"

My question is, is rigid water molecule in the SPC/E model or should use
the SHAKE algorithm for water in order to fix the length of bonds and
angles?
I would be more than pleased if someone could guide me.
Thank You in advance