Smart irrigation systems in parks and gardens in Barcelona, Spain, are monitored from a center. The sensors report the humidity in the ground. Thus, water is given to the plants in a timely manner. Thus, plant and water losses are prevented. The annual savings from smart parking irrigation systems are reported as 600,000 liters of water.
Citation:
http://www.libelium.com/saving-water-with-smart-irrigation-system-in-barcelona/