Here's an idea. Maybe I should commercialize the idea and make some money...Use Google Maps to identify broken sprinkler heads and insufficient watering of large lawns, school, city parks, golf courses, etc.
These images where pulled off Google maps and you can see distinct patterns in the greenness of the lawns that depend on the effective use of the sprinkler systems. The property or city maintenance manager could look at these images, identify sprinkler heads that do not work properly by the area of dead grass. Of course, this idea only works as frequently as Google updates their maps. Definitely an interesting idea here.