Controlled dissemination of water is what sprinklers offer.
If the sprinklers in your dreams were for the purpose of gardening, your dream is reflecting a desire to make sure that something you are in the process of creating will get a consistent amount of the attention necessary to complete the project or idea.
A sprinkler system that is designed to help put out fires is about the desire to keep sudden and unexpected changes at bay. Change can be overwhelming, and the presence of a sprinkler system in a dream indicates precautions against too much change too fast.
[1]