If you find a broken sprinkler head that is gushing or leaking water when your system is turned on, you must find some way to remedy the situation. Consider the following to determine whether it will be better for you to replace the leaky sprinkler head or cap it to stop the flow of water.
Capping vs. Replacement
Capping a sprinkler head involves simply unscrewing the head from the riser and screwing a cap onto the riser. Replacing the sprinkler head will involve much more. You will need a head that produces the right spray pattern, and then position it on the riser so it sprays in the right direction.