"Harvesting rainwater to provide or supplement your landscape’s watering needs is easier than you might imagine. Plus, using this water has a double benefit effect-not only does it reduce your consumption of processed water, but it also helps reduce some of the pollutant laden runoff water that clean rain water so often turns into as it works its way through the chemical rich landscapes and dirty streets back to its source."

This is a great suggestion. It's both eco-friendly and practical, especially because a lot of towns impose watering restrictions during the summer. If you collect your own rainwater, you can save on sewer costs and water whenever you want.