Wow Water!

As I sit here, I hear a thumping of a faucet not turned off all they way.  I start to think how this problem should be solved.  A small wheel placed in the faucet would generate a small charge powering a small cap that in return closes a valve to stop the water if left on for too long.  It should also include an override switch and a motion detector to note when someone is still using the water.  This could also be ran straight to wall power when installed to work without the water pressure,  The device then could double as an motion activated sink.  This would reduce water usage when brushing teeth or doing the dishes the good old fashion way with elbow grease.