(Thanks to Israel21c) Science teacher Amir Yechieli showed his school how to capture and reuse the rainwater that collected on its roofs. 15 years later he has helped 120 schools and now heads a new water conservation company Yevul Mayim (Saving water).
http://israel21c.org/environment/israels-rain-man-conserves-school-water/
http://savingtherain.org//PAGE13.asp