Israel's Arad Group CEO Dan Winter shows a water meter during a demonstration of a fly-by system, which collects data from water meters, in a field near Tel Aviv October 19, 2009. Outside a small town near Tel Aviv, a pilotless drone aircraft with a three-foot (1-metre) wingspan collects data from hundreds of gauges. A single technician with a laptop monitors the flight from the ground and receives an instant picture of the town's system, including, he says, a house with a leaky toilet. A plane that reads water meters -- as well as a tiny turbine that can generate electricity from within water pipes -- are among technologies Israeli companies are developing to help save billions of dollars in water lost from leaky pipes. Picture taken October 19, 2009. Reuters Pictures logo Reuters Pictures 27 months ago

Israel's Arad Group CEO Dan Winter shows a water meter during a demonstration of a fly-by system, which collects data from water meters, in a field near Tel Aviv October 19, 2009. Outside a small town near Tel Aviv, a pilotless drone aircraft with a three-foot (1-metre) wingspan collects data from hundreds of gauges. A single technician with a laptop monitors the flight from the ground and receives an instant picture of the town's system, including, he says, a house with a leaky toilet. A plane that reads water meters -- as well as a tiny turbine that can generate electricity from within water pipes -- are among technologies Israeli companies are developing to help save billions of dollars in water lost from leaky pipes. Picture taken October 19, 2009.