Here's a good rainy-day project: Collecting water-from a roof, driveway, or other hard surface during a rainfall-and channeling it into a rain barrel or other container to be saved for use in landscaping or in the household. Harvested rainwater has the potential for huge freshwater savings: It's estimated that the average American uses 80 to 100 gallons of water a day. Depending on the setup and the typical rainfall in your region, most or all of your water can be harvested. Harvested rainwater is sometimes used as potable water, too, but it typically must be filtered and/or chemically treated first; local health departments can provide more information on those requirements. Also called harvested rainwater.

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