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 E-Mail IMAGE: The built environment, from roads to sidewalks to parking lots, affects the water cycle and climate. Scientists at ORNL have explored the use of statistical relationships for evaluating representations of. view more  Credit: Andy Sproles/ORNL, U.S. Dept. of Energy Modeling - Urban climate impacts Researchers at Oak Ridge National Laboratory have identified a statistical relationship between the growth of cities and the spread of paved surfaces like roads and sidewalks. These impervious surfaces impede the flow of water into the ground, affecting the water cycle and, by extension, the climate. We ve shown that there is a specific mathematical shape to the relationship between a city s population and the total paved area, ORNL s Christa Brelsford said. Using that, we examined climate model predictions and determined they correctly represent some important attributes we know about cities.

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