A.M.
A couple of nice fountains or water features strategically placed around the property can drown out more than one might think...not to mention they're nice to look at, they add beauty and charm to any space, can set the mood, create a calm and relaxing atmosphere, provide ambiance, and provide for lush plantings (if you are so inclined) there really isn't a down side unless you find your bladder on the weaker side, or easily persuaded by the sound of water regardless of how it's running; rushing, flowing, bubbling, trickling...however if your bladder less inclined to say bubbling water, not easily persuaded by trickling or flowing, you simply choose a water feature which incorporates water in such a way that it allows only water that rushes, avoiding those persuasive sounds and uses of moving water opting not for the possibility of what one might consider or find embarrassing, not at all condussive to the mood atmosphere or ambiance you have outfitted your yard with, and probably harder to live with than say, the whole busy street annoying hum you were in hopes of ridding with your beautiful new water features.