In the past, scientists had estimated how much rainfall is intercepted by trees growing in rural areas. The scientists in this study wanted to know how much rainfall is intercepted by the trees that grow in an urban county in California. Note: In earlier Natural Inquirer articles like this one, the Discussion section is called “Implications.” Topics: Active Forest Management, Pollution, Water, Canopy, Deciduous Trees, Erosion, Evergreen Trees, Pollution.