Toilet Dimmer Switch

With constant warnings of power and water shortages, people are getting an awful lot of dimmer switches for their lights (unless you're a def and blind amish person without arms or a racecar, you should know what this is. It selects how bright your lights are). What about the water? Why don't we use a similar device on toilets? Do they already exist and I, too, am a def and blind amish person without arms or a racecar? Where did that spider go?

The toilet dimmer switch will have settings from a "Just pissing through" (with minor amounts of water) all the way to "the Goatse.cx maker" (small ocean for the Big Juan). After each flush it will automatically go to the lowest setting.